This is a note to let you know that I've just added the patch titled
x86/entry/64: Indent PUSH_AND_CLEAR_REGS and POP_REGS properly
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 92816f571af81e9a71cc6f3dc8ce1e2fcdf7b6b8 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 11:49:48 +0100
Subject: x86/entry/64: Indent PUSH_AND_CLEAR_REGS and POP_REGS properly
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 92816f571af81e9a71cc6f3dc8ce1e2fcdf7b6b8 upstream.
... same as the other macros in arch/x86/entry/calling.h
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Josh Poimboeuf <jpoimboe(a)redhat.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: dan.j.williams(a)intel.com
Link: http://lkml.kernel.org/r/20180211104949.12992-8-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/entry/calling.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -97,7 +97,7 @@ For 32-bit we have the following convent
#define SIZEOF_PTREGS 21*8
- .macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax
+.macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax
/*
* Push registers and sanitize registers of values that a
* speculation attack might otherwise want to exploit. The
@@ -131,9 +131,9 @@ For 32-bit we have the following convent
pushq %r15 /* pt_regs->r15 */
xorq %r15, %r15 /* nospec r15*/
UNWIND_HINT_REGS
- .endm
+.endm
- .macro POP_REGS pop_rdi=1 skip_r11rcx=0
+.macro POP_REGS pop_rdi=1 skip_r11rcx=0
popq %r15
popq %r14
popq %r13
@@ -163,7 +163,7 @@ For 32-bit we have the following convent
.macro icebp
.byte 0xf1
- .endm
+.endm
/*
* This is a sneaky trick to help the unwinder find pt_regs on the stack. The
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
x86/entry/64: Get rid of the ALLOC_PT_GPREGS_ON_STACK and SAVE_AND_CLEAR_REGS macros
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From dde3036d62ba3375840b10ab9ec0d568fd773b07 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 11:49:47 +0100
Subject: x86/entry/64: Get rid of the ALLOC_PT_GPREGS_ON_STACK and SAVE_AND_CLEAR_REGS macros
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit dde3036d62ba3375840b10ab9ec0d568fd773b07 upstream.
Previously, error_entry() and paranoid_entry() saved the GP registers
onto stack space previously allocated by its callers. Combine these two
steps in the callers, and use the generic PUSH_AND_CLEAR_REGS macro
for that.
This adds a significant amount ot text size. However, Ingo Molnar points
out that:
"these numbers also _very_ significantly over-represent the
extra footprint. The assumptions that resulted in
us compressing the IRQ entry code have changed very
significantly with the new x86 IRQ allocation code we
introduced in the last year:
- IRQ vectors are usually populated in tightly clustered
groups.
With our new vector allocator code the typical per CPU
allocation percentage on x86 systems is ~3 device vectors
and ~10 fixed vectors out of ~220 vectors - i.e. a very
low ~6% utilization (!). [...]
The days where we allocated a lot of vectors on every
CPU and the compression of the IRQ entry code text
mattered are over.
- Another issue is that only a small minority of vectors
is frequent enough to actually matter to cache utilization
in practice: 3-4 key IPIs and 1-2 device IRQs at most - and
those vectors tend to be tightly clustered as well into about
two groups, and are probably already on 2-3 cache lines in
practice.
For the common case of 'cache cold' IRQs it's the depth of
the call chain and the fragmentation of the resulting I$
that should be the main performance limit - not the overall
size of it.
- The CPU side cost of IRQ delivery is still very expensive
even in the best, most cached case, as in 'over a thousand
cycles'. So much stuff is done that maybe contemporary x86
IRQ entry microcode already prefetches the IDT entry and its
expected call target address."[*]
[*] http://lkml.kernel.org/r/20180208094710.qnjixhm6hybebdv7@gmail.com
The "testb $3, CS(%rsp)" instruction in the idtentry macro does not need
modification. Previously, %rsp was manually decreased by 15*8; with
this patch, %rsp is decreased by 15 pushq instructions.
[jpoimboe(a)redhat.com: unwind hint improvements]
Suggested-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Josh Poimboeuf <jpoimboe(a)redhat.com>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: dan.j.williams(a)intel.com
Link: http://lkml.kernel.org/r/20180211104949.12992-7-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/entry/calling.h | 42 +-----------------------------------------
arch/x86/entry/entry_64.S | 20 +++++++++-----------
2 files changed, 10 insertions(+), 52 deletions(-)
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -97,46 +97,6 @@ For 32-bit we have the following convent
#define SIZEOF_PTREGS 21*8
- .macro ALLOC_PT_GPREGS_ON_STACK
- addq $-(15*8), %rsp
- .endm
-
- .macro SAVE_AND_CLEAR_REGS offset=0
- /*
- * Save registers and sanitize registers of values that a
- * speculation attack might otherwise want to exploit. The
- * lower registers are likely clobbered well before they
- * could be put to use in a speculative execution gadget.
- * Interleave XOR with PUSH for better uop scheduling:
- */
- movq %rdi, 14*8+\offset(%rsp)
- movq %rsi, 13*8+\offset(%rsp)
- movq %rdx, 12*8+\offset(%rsp)
- movq %rcx, 11*8+\offset(%rsp)
- movq %rax, 10*8+\offset(%rsp)
- movq %r8, 9*8+\offset(%rsp)
- xorq %r8, %r8 /* nospec r8 */
- movq %r9, 8*8+\offset(%rsp)
- xorq %r9, %r9 /* nospec r9 */
- movq %r10, 7*8+\offset(%rsp)
- xorq %r10, %r10 /* nospec r10 */
- movq %r11, 6*8+\offset(%rsp)
- xorq %r11, %r11 /* nospec r11 */
- movq %rbx, 5*8+\offset(%rsp)
- xorl %ebx, %ebx /* nospec rbx */
- movq %rbp, 4*8+\offset(%rsp)
- xorl %ebp, %ebp /* nospec rbp */
- movq %r12, 3*8+\offset(%rsp)
- xorq %r12, %r12 /* nospec r12 */
- movq %r13, 2*8+\offset(%rsp)
- xorq %r13, %r13 /* nospec r13 */
- movq %r14, 1*8+\offset(%rsp)
- xorq %r14, %r14 /* nospec r14 */
- movq %r15, 0*8+\offset(%rsp)
- xorq %r15, %r15 /* nospec r15 */
- UNWIND_HINT_REGS offset=\offset
- .endm
-
.macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax
/*
* Push registers and sanitize registers of values that a
@@ -211,7 +171,7 @@ For 32-bit we have the following convent
* is just setting the LSB, which makes it an invalid stack address and is also
* a signal to the unwinder that it's a pt_regs pointer in disguise.
*
- * NOTE: This macro must be used *after* SAVE_AND_CLEAR_REGS because it corrupts
+ * NOTE: This macro must be used *after* PUSH_AND_CLEAR_REGS because it corrupts
* the original rbp.
*/
.macro ENCODE_FRAME_POINTER ptregs_offset=0
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -871,7 +871,9 @@ ENTRY(\sym)
pushq $-1 /* ORIG_RAX: no syscall to restart */
.endif
- ALLOC_PT_GPREGS_ON_STACK
+ /* Save all registers in pt_regs */
+ PUSH_AND_CLEAR_REGS
+ ENCODE_FRAME_POINTER
.if \paranoid < 2
testb $3, CS(%rsp) /* If coming from userspace, switch stacks */
@@ -1121,15 +1123,12 @@ idtentry machine_check do_mce has_err
#endif
/*
- * Save all registers in pt_regs, and switch gs if needed.
+ * Switch gs if needed.
* Use slow, but surefire "are we in kernel?" check.
* Return: ebx=0: need swapgs on exit, ebx=1: otherwise
*/
ENTRY(paranoid_entry)
- UNWIND_HINT_FUNC
cld
- SAVE_AND_CLEAR_REGS 8
- ENCODE_FRAME_POINTER 8
movl $1, %ebx
movl $MSR_GS_BASE, %ecx
rdmsr
@@ -1142,7 +1141,7 @@ ENTRY(paranoid_entry)
SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg=%rax save_reg=%r14
ret
-END(paranoid_entry)
+ENDPROC(paranoid_entry)
/*
* "Paranoid" exit path from exception stack. This is invoked
@@ -1173,14 +1172,12 @@ ENTRY(paranoid_exit)
END(paranoid_exit)
/*
- * Save all registers in pt_regs, and switch gs if needed.
+ * Switch gs if needed.
* Return: EBX=0: came from user mode; EBX=1: otherwise
*/
ENTRY(error_entry)
- UNWIND_HINT_FUNC
+ UNWIND_HINT_REGS offset=8
cld
- SAVE_AND_CLEAR_REGS 8
- ENCODE_FRAME_POINTER 8
testb $3, CS+8(%rsp)
jz .Lerror_kernelspace
@@ -1571,7 +1568,8 @@ end_repeat_nmi:
* frame to point back to repeat_nmi.
*/
pushq $-1 /* ORIG_RAX: no syscall to restart */
- ALLOC_PT_GPREGS_ON_STACK
+ PUSH_AND_CLEAR_REGS
+ ENCODE_FRAME_POINTER
/*
* Use paranoid_entry to handle SWAPGS, but no need to use paranoid_exit
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
x86/entry/64: Fix paranoid_entry() frame pointer warning
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From b3ccefaed922529e6a67de7b30af5aa38c76ace9 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
Date: Mon, 12 Feb 2018 11:45:03 -0600
Subject: x86/entry/64: Fix paranoid_entry() frame pointer warning
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
commit b3ccefaed922529e6a67de7b30af5aa38c76ace9 upstream.
With the following commit:
f09d160992d1 ("x86/entry/64: Get rid of the ALLOC_PT_GPREGS_ON_STACK and SAVE_AND_CLEAR_REGS macros")
... one of my suggested improvements triggered a frame pointer warning:
arch/x86/entry/entry_64.o: warning: objtool: paranoid_entry()+0x11: call without frame pointer save/setup
The warning is correct for the build-time code, but it's actually not
relevant at runtime because of paravirt patching. The paravirt swapgs
call gets replaced with either a SWAPGS instruction or NOPs at runtime.
Go back to the previous behavior by removing the ELF function annotation
for paranoid_entry() and adding an unwind hint, which effectively
silences the warning.
Reported-by: kbuild test robot <fengguang.wu(a)intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe(a)redhat.com>
Cc: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: kbuild-all(a)01.org
Cc: tipbuild(a)zytor.com
Fixes: f09d160992d1 ("x86/entry/64: Get rid of the ALLOC_PT_GPREGS_ON_STACK and SAVE_AND_CLEAR_REGS macros")
Link: http://lkml.kernel.org/r/20180212174503.5acbymg5z6p32snu@treble
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/entry/entry_64.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1128,6 +1128,7 @@ idtentry machine_check do_mce has_err
* Return: ebx=0: need swapgs on exit, ebx=1: otherwise
*/
ENTRY(paranoid_entry)
+ UNWIND_HINT_FUNC
cld
movl $1, %ebx
movl $MSR_GS_BASE, %ecx
@@ -1141,7 +1142,7 @@ ENTRY(paranoid_entry)
SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg=%rax save_reg=%r14
ret
-ENDPROC(paranoid_entry)
+END(paranoid_entry)
/*
* "Paranoid" exit path from exception stack. This is invoked
Patches currently in stable-queue which might be from jpoimboe(a)redhat.com are
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/entry/64: Fix CR3 restore in paranoid_exit()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From e48657573481a5dff7cfdc3d57005c80aa816500 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo(a)kernel.org>
Date: Wed, 14 Feb 2018 08:39:11 +0100
Subject: x86/entry/64: Fix CR3 restore in paranoid_exit()
From: Ingo Molnar <mingo(a)kernel.org>
commit e48657573481a5dff7cfdc3d57005c80aa816500 upstream.
Josh Poimboeuf noticed the following bug:
"The paranoid exit code only restores the saved CR3 when it switches back
to the user GS. However, even in the kernel GS case, it's possible that
it needs to restore a user CR3, if for example, the paranoid exception
occurred in the syscall exit path between SWITCH_TO_USER_CR3_STACK and
SWAPGS."
Josh also confirmed via targeted testing that it's possible to hit this bug.
Fix the bug by also restoring CR3 in the paranoid_exit_no_swapgs branch.
The reason we haven't seen this bug reported by users yet is probably because
"paranoid" entry points are limited to the following cases:
idtentry double_fault do_double_fault has_error_code=1 paranoid=2
idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
idtentry int3 do_int3 has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
idtentry machine_check do_mce has_error_code=0 paranoid=1
Amongst those entry points only machine_check is one that will interrupt an
IRQS-off critical section asynchronously - and machine check events are rare.
The other main asynchronous entries are NMI entries, which can be very high-freq
with perf profiling, but they are special: they don't use the 'idtentry' macro but
are open coded and restore user CR3 unconditionally so don't have this bug.
Reported-and-tested-by: Josh Poimboeuf <jpoimboe(a)redhat.com>
Reviewed-by: Andy Lutomirski <luto(a)kernel.org>
Acked-by: Thomas Gleixner <tglx(a)linutronix.de>
Cc: Arjan van de Ven <arjan(a)linux.intel.com>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
Cc: Dave Hansen <dave.hansen(a)linux.intel.com>
Cc: David Woodhouse <dwmw2(a)infradead.org>
Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Link: http://lkml.kernel.org/r/20180214073910.boevmg65upbk3vqb@gmail.com
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/entry/entry_64.S | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1168,6 +1168,7 @@ ENTRY(paranoid_exit)
jmp .Lparanoid_exit_restore
.Lparanoid_exit_no_swapgs:
TRACE_IRQS_IRETQ_DEBUG
+ RESTORE_CR3 scratch_reg=%rbx save_reg=%r14
.Lparanoid_exit_restore:
jmp restore_regs_and_return_to_kernel
END(paranoid_exit)
Patches currently in stable-queue which might be from mingo(a)kernel.org are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-spectre-fix-an-error-message.patch
queue-4.15/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-gpu-add-cfl-to-early-quirks.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-cpu-rename-cpu_data.x86_mask-to-cpu_data.x86_stepping.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-pkeys-remove-unused-functions.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-kexec-make-kexec-mostly-work-in-5-level-paging-mode.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/entry/64: Clear registers for exceptions/interrupts, to reduce speculation attack surface
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 3ac6d8c787b835b997eb23e43e09aa0895ef7d58 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams(a)intel.com>
Date: Mon, 5 Feb 2018 17:18:11 -0800
Subject: x86/entry/64: Clear registers for exceptions/interrupts, to reduce speculation attack surface
From: Dan Williams <dan.j.williams(a)intel.com>
commit 3ac6d8c787b835b997eb23e43e09aa0895ef7d58 upstream.
Clear the 'extra' registers on entering the 64-bit kernel for exceptions
and interrupts. The common registers are not cleared since they are
likely clobbered well before they can be exploited in a speculative
execution attack.
Originally-From: Andi Kleen <ak(a)linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams(a)intel.com>
Cc: <stable(a)vger.kernel.org>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Josh Poimboeuf <jpoimboe(a)redhat.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Link: http://lkml.kernel.org/r/151787989146.7847.15749181712358213254.stgit@dwill…
[ Made small improvements to the changelog and the code comments. ]
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/entry/calling.h | 19 +++++++++++++++++++
arch/x86/entry/entry_64.S | 6 +++++-
2 files changed, 24 insertions(+), 1 deletion(-)
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -147,6 +147,25 @@ For 32-bit we have the following convent
UNWIND_HINT_REGS offset=\offset
.endm
+ /*
+ * Sanitize registers of values that a speculation attack
+ * might otherwise want to exploit. The lower registers are
+ * likely clobbered well before they could be put to use in
+ * a speculative execution gadget:
+ */
+ .macro CLEAR_REGS_NOSPEC
+ xorl %ebp, %ebp
+ xorl %ebx, %ebx
+ xorq %r8, %r8
+ xorq %r9, %r9
+ xorq %r10, %r10
+ xorq %r11, %r11
+ xorq %r12, %r12
+ xorq %r13, %r13
+ xorq %r14, %r14
+ xorq %r15, %r15
+ .endm
+
.macro POP_EXTRA_REGS
popq %r15
popq %r14
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -575,6 +575,7 @@ END(irq_entries_start)
ALLOC_PT_GPREGS_ON_STACK
SAVE_C_REGS
SAVE_EXTRA_REGS
+ CLEAR_REGS_NOSPEC
ENCODE_FRAME_POINTER
testb $3, CS(%rsp)
@@ -1133,6 +1134,7 @@ ENTRY(xen_failsafe_callback)
ALLOC_PT_GPREGS_ON_STACK
SAVE_C_REGS
SAVE_EXTRA_REGS
+ CLEAR_REGS_NOSPEC
ENCODE_FRAME_POINTER
jmp error_exit
END(xen_failsafe_callback)
@@ -1178,6 +1180,7 @@ ENTRY(paranoid_entry)
cld
SAVE_C_REGS 8
SAVE_EXTRA_REGS 8
+ CLEAR_REGS_NOSPEC
ENCODE_FRAME_POINTER 8
movl $1, %ebx
movl $MSR_GS_BASE, %ecx
@@ -1230,8 +1233,8 @@ ENTRY(error_entry)
cld
SAVE_C_REGS 8
SAVE_EXTRA_REGS 8
+ CLEAR_REGS_NOSPEC
ENCODE_FRAME_POINTER 8
- xorl %ebx, %ebx
testb $3, CS+8(%rsp)
jz .Lerror_kernelspace
@@ -1428,6 +1431,7 @@ ENTRY(nmi)
pushq %r14 /* pt_regs->r14 */
pushq %r15 /* pt_regs->r15 */
UNWIND_HINT_REGS
+ CLEAR_REGS_NOSPEC
ENCODE_FRAME_POINTER
/*
Patches currently in stable-queue which might be from dan.j.williams(a)intel.com are
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/debug: Use UD2 for WARN()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-debug-use-ud2-for-warn.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 3b3a371cc9bc980429baabe0a8e5f307f3d1f463 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz(a)infradead.org>
Date: Fri, 9 Feb 2018 13:16:59 +0100
Subject: x86/debug: Use UD2 for WARN()
From: Peter Zijlstra <peterz(a)infradead.org>
commit 3b3a371cc9bc980429baabe0a8e5f307f3d1f463 upstream.
Since the Intel SDM added an ModR/M byte to UD0 and binutils followed
that specification, we now cannot disassemble our kernel anymore.
This now means Intel and AMD disagree on the encoding of UD0. And instead
of playing games with additional bytes that are valid ModR/M and single
byte instructions (0xd6 for instance), simply use UD2 for both WARN() and
BUG().
Requested-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org>
Acked-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Arjan van de Ven <arjan(a)linux.intel.com>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Josh Poimboeuf <jpoimboe(a)redhat.com>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Link: http://lkml.kernel.org/r/20180208194406.GD25181@hirez.programming.kicks-ass…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/bug.h | 15 ++++++---------
arch/x86/kernel/traps.c | 2 +-
2 files changed, 7 insertions(+), 10 deletions(-)
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -5,23 +5,20 @@
#include <linux/stringify.h>
/*
- * Since some emulators terminate on UD2, we cannot use it for WARN.
- * Since various instruction decoders disagree on the length of UD1,
- * we cannot use it either. So use UD0 for WARN.
+ * Despite that some emulators terminate on UD2, we use it for WARN().
*
- * (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas
- * our kernel decoder thinks it takes a ModRM byte, which seems consistent
- * with various things like the Intel SDM instruction encoding rules)
+ * Since various instruction decoders/specs disagree on the encoding of
+ * UD0/UD1.
*/
-#define ASM_UD0 ".byte 0x0f, 0xff"
+#define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */
#define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */
#define ASM_UD2 ".byte 0x0f, 0x0b"
#define INSN_UD0 0xff0f
#define INSN_UD2 0x0b0f
-#define LEN_UD0 2
+#define LEN_UD2 2
#ifdef CONFIG_GENERIC_BUG
@@ -79,7 +76,7 @@ do { \
#define __WARN_FLAGS(flags) \
do { \
- _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags)); \
+ _BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \
annotate_reachable(); \
} while (0)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -181,7 +181,7 @@ int fixup_bug(struct pt_regs *regs, int
break;
case BUG_TRAP_TYPE_WARN:
- regs->ip += LEN_UD0;
+ regs->ip += LEN_UD2;
return 1;
}
Patches currently in stable-queue which might be from peterz(a)infradead.org are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-spectre-fix-an-error-message.patch
queue-4.15/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-cpu-rename-cpu_data.x86_mask-to-cpu_data.x86_stepping.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-pkeys-remove-unused-functions.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-kexec-make-kexec-mostly-work-in-5-level-paging-mode.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/debug, objtool: Annotate WARN()-related UD2 as reachable
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 2b5db66862b95532cb6cca8165ae6eb73633cf85 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
Date: Thu, 8 Feb 2018 17:09:26 -0600
Subject: x86/debug, objtool: Annotate WARN()-related UD2 as reachable
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
commit 2b5db66862b95532cb6cca8165ae6eb73633cf85 upstream.
By default, objtool assumes that a UD2 is a dead end. This is mainly
because GCC 7+ sometimes inserts a UD2 when it detects a divide-by-zero
condition.
Now that WARN() is moving back to UD2, annotate the code after it as
reachable so objtool can follow the code flow.
Reported-by: Borislav Petkov <bp(a)alien8.de>
Signed-off-by: Josh Poimboeuf <jpoimboe(a)redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Arjan van de Ven <arjan(a)linux.intel.com>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: kbuild test robot <fengguang.wu(a)intel.com>
Link: http://lkml.kernel.org/r/0e483379275a42626ba8898117f918e1bf661e40.151813069…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/bug.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -77,7 +77,11 @@ do { \
unreachable(); \
} while (0)
-#define __WARN_FLAGS(flags) _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags))
+#define __WARN_FLAGS(flags) \
+do { \
+ _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags)); \
+ annotate_reachable(); \
+} while (0)
#include <asm-generic/bug.h>
Patches currently in stable-queue which might be from jpoimboe(a)redhat.com are
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
selftests/x86/pkeys: Remove unused functions
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-pkeys-remove-unused-functions.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From ce676638fe7b284132a7d7d5e7e7ad81bab9947e Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo(a)kernel.org>
Date: Tue, 13 Feb 2018 08:26:17 +0100
Subject: selftests/x86/pkeys: Remove unused functions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Ingo Molnar <mingo(a)kernel.org>
commit ce676638fe7b284132a7d7d5e7e7ad81bab9947e upstream.
This also gets rid of two build warnings:
protection_keys.c: In function ‘dumpit’:
protection_keys.c:419:3: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(1, buf, nr_read);
^~~~~~~~~~~~~~~~~~~~~~
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: Dave Hansen <dave.hansen(a)linux.intel.com>
Cc: Shuah Khan <shuahkh(a)osg.samsung.com>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: linux-kernel(a)vger.kernel.org
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/protection_keys.c | 28 --------------------------
1 file changed, 28 deletions(-)
--- a/tools/testing/selftests/x86/protection_keys.c
+++ b/tools/testing/selftests/x86/protection_keys.c
@@ -393,34 +393,6 @@ pid_t fork_lazy_child(void)
return forkret;
}
-void davecmp(void *_a, void *_b, int len)
-{
- int i;
- unsigned long *a = _a;
- unsigned long *b = _b;
-
- for (i = 0; i < len / sizeof(*a); i++) {
- if (a[i] == b[i])
- continue;
-
- dprintf3("[%3d]: a: %016lx b: %016lx\n", i, a[i], b[i]);
- }
-}
-
-void dumpit(char *f)
-{
- int fd = open(f, O_RDONLY);
- char buf[100];
- int nr_read;
-
- dprintf2("maps fd: %d\n", fd);
- do {
- nr_read = read(fd, &buf[0], sizeof(buf));
- write(1, buf, nr_read);
- } while (nr_read > 0);
- close(fd);
-}
-
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
Patches currently in stable-queue which might be from mingo(a)kernel.org are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-spectre-fix-an-error-message.patch
queue-4.15/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-gpu-add-cfl-to-early-quirks.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-cpu-rename-cpu_data.x86_mask-to-cpu_data.x86_stepping.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-pkeys-remove-unused-functions.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-kexec-make-kexec-mostly-work-in-5-level-paging-mode.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/cpu: Change type of x86_cache_size variable to unsigned int
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 24dbc6000f4b9b0ef5a9daecb161f1907733765a Mon Sep 17 00:00:00 2001
From: "Gustavo A. R. Silva" <garsilva(a)embeddedor.com>
Date: Tue, 13 Feb 2018 13:22:08 -0600
Subject: x86/cpu: Change type of x86_cache_size variable to unsigned int
From: Gustavo A. R. Silva <garsilva(a)embeddedor.com>
commit 24dbc6000f4b9b0ef5a9daecb161f1907733765a upstream.
Currently, x86_cache_size is of type int, which makes no sense as we
will never have a valid cache size equal or less than 0. So instead of
initializing this variable to -1, it can perfectly be initialized to 0
and use it as an unsigned variable instead.
Suggested-by: Thomas Gleixner <tglx(a)linutronix.de>
Signed-off-by: Gustavo A. R. Silva <garsilva(a)embeddedor.com>
Cc: Borislav Petkov <bp(a)alien8.de>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Addresses-Coverity-ID: 1464429
Link: http://lkml.kernel.org/r/20180213192208.GA26414@embeddedor.com
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/processor.h | 2 +-
arch/x86/kernel/cpu/common.c | 2 +-
arch/x86/kernel/cpu/microcode/intel.c | 2 +-
arch/x86/kernel/cpu/proc.c | 4 ++--
4 files changed, 5 insertions(+), 5 deletions(-)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -109,7 +109,7 @@ struct cpuinfo_x86 {
char x86_vendor_id[16];
char x86_model_id[64];
/* in KB - valid for CPUS which support this call: */
- int x86_cache_size;
+ unsigned int x86_cache_size;
int x86_cache_alignment; /* In bytes */
/* Cache QoS architectural values: */
int x86_cache_max_rmid; /* max index */
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1184,7 +1184,7 @@ static void identify_cpu(struct cpuinfo_
int i;
c->loops_per_jiffy = loops_per_jiffy;
- c->x86_cache_size = -1;
+ c->x86_cache_size = 0;
c->x86_vendor = X86_VENDOR_UNKNOWN;
c->x86_model = c->x86_stepping = 0; /* So far unknown... */
c->x86_vendor_id[0] = '\0'; /* Unset */
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -982,7 +982,7 @@ static struct microcode_ops microcode_in
static int __init calc_llc_size_per_core(struct cpuinfo_x86 *c)
{
- u64 llc_size = c->x86_cache_size * 1024;
+ u64 llc_size = c->x86_cache_size * 1024ULL;
do_div(llc_size, c->x86_max_cores);
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -91,8 +91,8 @@ static int show_cpuinfo(struct seq_file
}
/* Cache size */
- if (c->x86_cache_size >= 0)
- seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
+ if (c->x86_cache_size)
+ seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
show_cpuinfo_core(m, c, cpu);
show_cpuinfo_misc(m, c);
Patches currently in stable-queue which might be from garsilva(a)embeddedor.com are
queue-4.15/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
This is a note to let you know that I've just added the patch titled
selftests/x86/mpx: Fix incorrect bounds with old _sigfault
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 961888b1d76d84efc66a8f5604b06ac12ac2f978 Mon Sep 17 00:00:00 2001
From: Rui Wang <rui.y.wang(a)intel.com>
Date: Mon, 18 Dec 2017 16:34:10 +0800
Subject: selftests/x86/mpx: Fix incorrect bounds with old _sigfault
From: Rui Wang <rui.y.wang(a)intel.com>
commit 961888b1d76d84efc66a8f5604b06ac12ac2f978 upstream.
For distributions with old userspace header files, the _sigfault
structure is different. mpx-mini-test fails with the following
error:
[root@Purley]# mpx-mini-test_64 tabletest
XSAVE is supported by HW & OS
XSAVE processor supported state mask: 0x2ff
XSAVE OS supported state mask: 0x2ff
BNDREGS: size: 64 user: 1 supervisor: 0 aligned: 0
BNDCSR: size: 64 user: 1 supervisor: 0 aligned: 0
starting mpx bounds table test
ERROR: siginfo bounds do not match shadow bounds for register 0
Fix it by using the correct offset of _lower/_upper in _sigfault.
RHEL needs this patch to work.
Signed-off-by: Rui Wang <rui.y.wang(a)intel.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: dave.hansen(a)linux.intel.com
Fixes: e754aedc26ef ("x86/mpx, selftests: Add MPX self test")
Link: http://lkml.kernel.org/r/1513586050-1641-1-git-send-email-rui.y.wang@intel.…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/mpx-mini-test.c | 32 ++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
--- a/tools/testing/selftests/x86/mpx-mini-test.c
+++ b/tools/testing/selftests/x86/mpx-mini-test.c
@@ -315,11 +315,39 @@ static inline void *__si_bounds_upper(si
return si->si_upper;
}
#else
+
+/*
+ * This deals with old version of _sigfault in some distros:
+ *
+
+old _sigfault:
+ struct {
+ void *si_addr;
+ } _sigfault;
+
+new _sigfault:
+ struct {
+ void __user *_addr;
+ int _trapno;
+ short _addr_lsb;
+ union {
+ struct {
+ void __user *_lower;
+ void __user *_upper;
+ } _addr_bnd;
+ __u32 _pkey;
+ };
+ } _sigfault;
+ *
+ */
+
static inline void **__si_bounds_hack(siginfo_t *si)
{
void *sigfault = &si->_sifields._sigfault;
void *end_sigfault = sigfault + sizeof(si->_sifields._sigfault);
- void **__si_lower = end_sigfault;
+ int *trapno = (int*)end_sigfault;
+ /* skip _trapno and _addr_lsb */
+ void **__si_lower = (void**)(trapno + 2);
return __si_lower;
}
@@ -331,7 +359,7 @@ static inline void *__si_bounds_lower(si
static inline void *__si_bounds_upper(siginfo_t *si)
{
- return (*__si_bounds_hack(si)) + sizeof(void *);
+ return *(__si_bounds_hack(si) + 1);
}
#endif
Patches currently in stable-queue which might be from rui.y.wang(a)intel.com are
queue-4.15/selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Fix vDSO selftest segfault for vsyscall=none
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 198ee8e17502da2634f7366395db1d77630e0219 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 12:10:10 +0100
Subject: selftests/x86: Fix vDSO selftest segfault for vsyscall=none
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 198ee8e17502da2634f7366395db1d77630e0219 upstream.
The vDSO selftest tries to execute a vsyscall unconditionally, even if it
is not present on the test system (e.g. if booted with vsyscall=none or
with CONFIG_LEGACY_VSYSCALL_NONE=y set. Fix this by copying (and tweaking)
the vsyscall check from test_vsyscall.c
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andrew Lutomirski <luto(a)kernel.org>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-3-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/test_vdso.c | 50 +++++++++++++++++++++++++++-----
1 file changed, 43 insertions(+), 7 deletions(-)
--- a/tools/testing/selftests/x86/test_vdso.c
+++ b/tools/testing/selftests/x86/test_vdso.c
@@ -28,18 +28,52 @@
int nerrs = 0;
+typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
+
+getcpu_t vgetcpu;
+getcpu_t vdso_getcpu;
+
+static void *vsyscall_getcpu(void)
+{
#ifdef __x86_64__
-# define VSYS(x) (x)
+ FILE *maps;
+ char line[128];
+ bool found = false;
+
+ maps = fopen("/proc/self/maps", "r");
+ if (!maps) /* might still be present, but ignore it here, as we test vDSO not vsyscall */
+ return NULL;
+
+ while (fgets(line, sizeof(line), maps)) {
+ char r, x;
+ void *start, *end;
+ char name[128];
+ if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
+ &start, &end, &r, &x, name) != 5)
+ continue;
+
+ if (strcmp(name, "[vsyscall]"))
+ continue;
+
+ /* assume entries are OK, as we test vDSO here not vsyscall */
+ found = true;
+ break;
+ }
+
+ fclose(maps);
+
+ if (!found) {
+ printf("Warning: failed to find vsyscall getcpu\n");
+ return NULL;
+ }
+ return (void *) (0xffffffffff600800);
#else
-# define VSYS(x) 0
+ return NULL;
#endif
+}
-typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
-
-const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
-getcpu_t vdso_getcpu;
-void fill_function_pointers()
+static void fill_function_pointers()
{
void *vdso = dlopen("linux-vdso.so.1",
RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
@@ -54,6 +88,8 @@ void fill_function_pointers()
vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
if (!vdso_getcpu)
printf("Warning: failed to find getcpu in vDSO\n");
+
+ vgetcpu = (getcpu_t) vsyscall_getcpu();
}
static long sys_getcpu(unsigned * cpu, unsigned * node,
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Fix build bug caused by the 5lvl test which has been moved to the VM directory
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 7f95122067ab26fb8344b2a9de64ffbd0fea0010 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 12:10:09 +0100
Subject: selftests/x86: Fix build bug caused by the 5lvl test which has been moved to the VM directory
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 7f95122067ab26fb8344b2a9de64ffbd0fea0010 upstream.
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Fixes: 235266b8e11c "selftests/vm: move 128TB mmap boundary test to generic directory"
Link: http://lkml.kernel.org/r/20180211111013.16888-2-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -11,7 +11,7 @@ TARGETS_C_BOTHBITS := single_step_syscal
TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault test_syscall_vdso unwind_vdso \
test_FCMOV test_FCOMI test_FISTTP \
vdso_restorer
-TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip 5lvl
+TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip
TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)
TARGETS_C_64BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_64BIT_ONLY)
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Do not rely on "int $0x80" in single_step_syscall.c
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 4105c69703cdeba76f384b901712c9397b04e9c2 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Tue, 13 Feb 2018 09:13:21 +0100
Subject: selftests/x86: Do not rely on "int $0x80" in single_step_syscall.c
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 4105c69703cdeba76f384b901712c9397b04e9c2 upstream.
On 64-bit builds, we should not rely on "int $0x80" working (it only does if
CONFIG_IA32_EMULATION=y is enabled). To keep the "Set TF and check int80"
test running on 64-bit installs with CONFIG_IA32_EMULATION=y enabled, build
this test only if we can also build 32-bit binaries (which should be a
good approximation for that).
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Dmitry Safonov <dsafonov(a)virtuozzo.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-5-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/Makefile | 2 ++
tools/testing/selftests/x86/single_step_syscall.c | 5 ++++-
2 files changed, 6 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -30,11 +30,13 @@ CAN_BUILD_X86_64 := $(shell ./check_cc.s
ifeq ($(CAN_BUILD_I386),1)
all: all_32
TEST_PROGS += $(BINARIES_32)
+EXTRA_CFLAGS += -DCAN_BUILD_32
endif
ifeq ($(CAN_BUILD_X86_64),1)
all: all_64
TEST_PROGS += $(BINARIES_64)
+EXTRA_CFLAGS += -DCAN_BUILD_64
endif
all_32: $(BINARIES_32)
--- a/tools/testing/selftests/x86/single_step_syscall.c
+++ b/tools/testing/selftests/x86/single_step_syscall.c
@@ -119,7 +119,9 @@ static void check_result(void)
int main()
{
+#ifdef CAN_BUILD_32
int tmp;
+#endif
sethandler(SIGTRAP, sigtrap, 0);
@@ -139,12 +141,13 @@ int main()
: : "c" (post_nop) : "r11");
check_result();
#endif
-
+#ifdef CAN_BUILD_32
printf("[RUN]\tSet TF and check int80\n");
set_eflags(get_eflags() | X86_EFLAGS_TF);
asm volatile ("int $0x80" : "=a" (tmp) : "a" (SYS_getpid)
: INT80_CLOBBERS);
check_result();
+#endif
/*
* This test is particularly interesting if fast syscalls use
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 2cbc0d66de0480449c75636f55697c7ff3af61fc Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 12:10:11 +0100
Subject: selftests/x86: Do not rely on "int $0x80" in test_mremap_vdso.c
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 2cbc0d66de0480449c75636f55697c7ff3af61fc upstream.
On 64-bit builds, we should not rely on "int $0x80" working (it only does if
CONFIG_IA32_EMULATION=y is enabled).
Without this patch, the move test may succeed, but the "int $0x80" causes
a segfault, resulting in a false negative output of this self-test.
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Dmitry Safonov <dsafonov(a)virtuozzo.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-4-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/test_mremap_vdso.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/tools/testing/selftests/x86/test_mremap_vdso.c
+++ b/tools/testing/selftests/x86/test_mremap_vdso.c
@@ -90,8 +90,12 @@ int main(int argc, char **argv, char **e
vdso_size += PAGE_SIZE;
}
+#ifdef __i386__
/* Glibc is likely to explode now - exit with raw syscall */
asm volatile ("int $0x80" : : "a" (__NR_exit), "b" (!!ret));
+#else /* __x86_64__ */
+ syscall(SYS_exit, ret);
+#endif
} else {
int status;
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Disable tests requiring 32-bit support on pure 64-bit systems
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 9279ddf23ce78ff2676e8e8e19fec0f022c26d04 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Tue, 13 Feb 2018 09:15:19 +0100
Subject: selftests/x86: Disable tests requiring 32-bit support on pure 64-bit systems
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit 9279ddf23ce78ff2676e8e8e19fec0f022c26d04 upstream.
The ldt_gdt and ptrace_syscall selftests, even in their 64-bit variant, use
hard-coded 32-bit syscall numbers and call "int $0x80".
This will fail on 64-bit systems with CONFIG_IA32_EMULATION=y disabled.
Therefore, do not build these tests if we cannot build 32-bit binaries
(which should be a good approximation for CONFIG_IA32_EMULATION=y being enabled).
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Dmitry Safonov <dsafonov(a)virtuozzo.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Link: http://lkml.kernel.org/r/20180211111013.16888-6-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/Makefile | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -5,16 +5,26 @@ include ../lib.mk
.PHONY: all all_32 all_64 warn_32bit_failure clean
-TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt ptrace_syscall test_mremap_vdso \
- check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test ioperm \
+UNAME_M := $(shell uname -m)
+CAN_BUILD_I386 := $(shell ./check_cc.sh $(CC) trivial_32bit_program.c -m32)
+CAN_BUILD_X86_64 := $(shell ./check_cc.sh $(CC) trivial_64bit_program.c)
+
+TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \
+ check_initial_reg_state sigreturn iopl mpx-mini-test ioperm \
protection_keys test_vdso test_vsyscall
TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault test_syscall_vdso unwind_vdso \
test_FCMOV test_FCOMI test_FISTTP \
vdso_restorer
TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip
+# Some selftests require 32bit support enabled also on 64bit systems
+TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
-TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)
+TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY) $(TARGETS_C_32BIT_NEEDED)
TARGETS_C_64BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_64BIT_ONLY)
+ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),11)
+TARGETS_C_64BIT_ALL += $(TARGETS_C_32BIT_NEEDED)
+endif
+
BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)
BINARIES_64 := $(TARGETS_C_64BIT_ALL:%=%_64)
@@ -23,10 +33,6 @@ BINARIES_64 := $(patsubst %,$(OUTPUT)/%,
CFLAGS := -O2 -g -std=gnu99 -pthread -Wall -no-pie
-UNAME_M := $(shell uname -m)
-CAN_BUILD_I386 := $(shell ./check_cc.sh $(CC) trivial_32bit_program.c -m32)
-CAN_BUILD_X86_64 := $(shell ./check_cc.sh $(CC) trivial_64bit_program.c)
-
ifeq ($(CAN_BUILD_I386),1)
all: all_32
TEST_PROGS += $(BINARIES_32)
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
selftests/x86: Clean up and document sscanf() usage
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
selftests-x86-clean-up-and-document-sscanf-usage.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From d8e92de8ef952bed88c56c7a44c02d8dcae0984e Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
Date: Sun, 11 Feb 2018 21:59:24 +0100
Subject: selftests/x86: Clean up and document sscanf() usage
From: Dominik Brodowski <linux(a)dominikbrodowski.net>
commit d8e92de8ef952bed88c56c7a44c02d8dcae0984e upstream.
Replace a couple of magically connected buffer length literal constants with
a common definition that makes their relationship obvious. Also document
why our sscanf() usage is safe.
No intended functional changes.
Suggested-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Dominik Brodowski <linux(a)dominikbrodowski.net>
Cc: Andrew Lutomirski <luto(a)kernel.org>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: linux-kselftest(a)vger.kernel.org
Cc: shuah(a)kernel.org
Link: http://lkml.kernel.org/r/20180211205924.GA23210@light.dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/testing/selftests/x86/test_vdso.c | 11 ++++++++---
tools/testing/selftests/x86/test_vsyscall.c | 11 ++++++++---
2 files changed, 16 insertions(+), 6 deletions(-)
--- a/tools/testing/selftests/x86/test_vdso.c
+++ b/tools/testing/selftests/x86/test_vdso.c
@@ -26,6 +26,9 @@
# endif
#endif
+/* max length of lines in /proc/self/maps - anything longer is skipped here */
+#define MAPS_LINE_LEN 128
+
int nerrs = 0;
typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
@@ -37,17 +40,19 @@ static void *vsyscall_getcpu(void)
{
#ifdef __x86_64__
FILE *maps;
- char line[128];
+ char line[MAPS_LINE_LEN];
bool found = false;
maps = fopen("/proc/self/maps", "r");
if (!maps) /* might still be present, but ignore it here, as we test vDSO not vsyscall */
return NULL;
- while (fgets(line, sizeof(line), maps)) {
+ while (fgets(line, MAPS_LINE_LEN, maps)) {
char r, x;
void *start, *end;
- char name[128];
+ char name[MAPS_LINE_LEN];
+
+ /* sscanf() is safe here as strlen(name) >= strlen(line) */
if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
&start, &end, &r, &x, name) != 5)
continue;
--- a/tools/testing/selftests/x86/test_vsyscall.c
+++ b/tools/testing/selftests/x86/test_vsyscall.c
@@ -33,6 +33,9 @@
# endif
#endif
+/* max length of lines in /proc/self/maps - anything longer is skipped here */
+#define MAPS_LINE_LEN 128
+
static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
int flags)
{
@@ -98,7 +101,7 @@ static int init_vsys(void)
#ifdef __x86_64__
int nerrs = 0;
FILE *maps;
- char line[128];
+ char line[MAPS_LINE_LEN];
bool found = false;
maps = fopen("/proc/self/maps", "r");
@@ -108,10 +111,12 @@ static int init_vsys(void)
return 0;
}
- while (fgets(line, sizeof(line), maps)) {
+ while (fgets(line, MAPS_LINE_LEN, maps)) {
char r, x;
void *start, *end;
- char name[128];
+ char name[MAPS_LINE_LEN];
+
+ /* sscanf() is safe here as strlen(name) >= strlen(line) */
if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
&start, &end, &r, &x, name) != 5)
continue;
Patches currently in stable-queue which might be from linux(a)dominikbrodowski.net are
queue-4.15/selftests-x86-fix-build-bug-caused-by-the-5lvl-test-which-has-been-moved-to-the-vm-directory.patch
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.15/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.15/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
This is a note to let you know that I've just added the patch titled
objtool: Fix segfault in ignore_unreachable_insn()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
objtool-fix-segfault-in-ignore_unreachable_insn.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From fe24e27128252c230a34a6c628da2bf1676781ea Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
Date: Thu, 8 Feb 2018 17:09:25 -0600
Subject: objtool: Fix segfault in ignore_unreachable_insn()
From: Josh Poimboeuf <jpoimboe(a)redhat.com>
commit fe24e27128252c230a34a6c628da2bf1676781ea upstream.
Peter Zijlstra's patch for converting WARN() to use UD2 triggered a
bunch of false "unreachable instruction" warnings, which then triggered
a seg fault in ignore_unreachable_insn().
The seg fault happened when it tried to dereference a NULL 'insn->func'
pointer. Thanks to static_cpu_has(), some functions can jump to a
non-function area in the .altinstr_aux section. That breaks
ignore_unreachable_insn()'s assumption that it's always inside the
original function.
Make sure ignore_unreachable_insn() only follows jumps within the
current function.
Reported-by: Borislav Petkov <bp(a)alien8.de>
Signed-off-by: Josh Poimboeuf <jpoimboe(a)redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Arjan van de Ven <arjan(a)linux.intel.com>
Cc: Brian Gerst <brgerst(a)gmail.com>
Cc: Denys Vlasenko <dvlasenk(a)redhat.com>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: kbuild test robot <fengguang.wu(a)intel.com>
Link: http://lkml.kernel.org/r/bace77a60d5af9b45eddb8f8fb9c776c8de657ef.151813069…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
tools/objtool/check.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1935,13 +1935,19 @@ static bool ignore_unreachable_insn(stru
if (is_kasan_insn(insn) || is_ubsan_insn(insn))
return true;
- if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest) {
- insn = insn->jump_dest;
- continue;
+ if (insn->type == INSN_JUMP_UNCONDITIONAL) {
+ if (insn->jump_dest &&
+ insn->jump_dest->func == insn->func) {
+ insn = insn->jump_dest;
+ continue;
+ }
+
+ break;
}
if (insn->offset + insn->len >= insn->func->offset + insn->func->len)
break;
+
insn = list_next_entry(insn, list);
}
Patches currently in stable-queue which might be from jpoimboe(a)redhat.com are
queue-4.15/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.15/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.15/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.15/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.15/x86-debug-use-ud2-for-warn.patch
queue-4.15/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.15/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.15/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.15/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.15/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.15/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.15/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.15/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
nospec: Move array_index_nospec() parameter checking into separate macro
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 8fa80c503b484ddc1abbd10c7cb2ab81f3824a50 Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon(a)arm.com>
Date: Mon, 5 Feb 2018 14:16:06 +0000
Subject: nospec: Move array_index_nospec() parameter checking into separate macro
From: Will Deacon <will.deacon(a)arm.com>
commit 8fa80c503b484ddc1abbd10c7cb2ab81f3824a50 upstream.
For architectures providing their own implementation of
array_index_mask_nospec() in asm/barrier.h, attempting to use WARN_ONCE() to
complain about out-of-range parameters using WARN_ON() results in a mess
of mutually-dependent include files.
Rather than unpick the dependencies, simply have the core code in nospec.h
perform the checking for us.
Signed-off-by: Will Deacon <will.deacon(a)arm.com>
Acked-by: Thomas Gleixner <tglx(a)linutronix.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Link: http://lkml.kernel.org/r/1517840166-15399-1-git-send-email-will.deacon@arm.…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
include/linux/nospec.h | 36 +++++++++++++++++++++---------------
1 file changed, 21 insertions(+), 15 deletions(-)
--- a/include/linux/nospec.h
+++ b/include/linux/nospec.h
@@ -20,20 +20,6 @@ static inline unsigned long array_index_
unsigned long size)
{
/*
- * Warn developers about inappropriate array_index_nospec() usage.
- *
- * Even if the CPU speculates past the WARN_ONCE branch, the
- * sign bit of @index is taken into account when generating the
- * mask.
- *
- * This warning is compiled out when the compiler can infer that
- * @index and @size are less than LONG_MAX.
- */
- if (WARN_ONCE(index > LONG_MAX || size > LONG_MAX,
- "array_index_nospec() limited to range of [0, LONG_MAX]\n"))
- return 0;
-
- /*
* Always calculate and emit the mask even if the compiler
* thinks the mask is not needed. The compiler does not take
* into account the value of @index under speculation.
@@ -44,6 +30,26 @@ static inline unsigned long array_index_
#endif
/*
+ * Warn developers about inappropriate array_index_nospec() usage.
+ *
+ * Even if the CPU speculates past the WARN_ONCE branch, the
+ * sign bit of @index is taken into account when generating the
+ * mask.
+ *
+ * This warning is compiled out when the compiler can infer that
+ * @index and @size are less than LONG_MAX.
+ */
+#define array_index_mask_nospec_check(index, size) \
+({ \
+ if (WARN_ONCE(index > LONG_MAX || size > LONG_MAX, \
+ "array_index_nospec() limited to range of [0, LONG_MAX]\n")) \
+ _mask = 0; \
+ else \
+ _mask = array_index_mask_nospec(index, size); \
+ _mask; \
+})
+
+/*
* array_index_nospec - sanitize an array index after a bounds check
*
* For a code sequence like:
@@ -61,7 +67,7 @@ static inline unsigned long array_index_
({ \
typeof(index) _i = (index); \
typeof(size) _s = (size); \
- unsigned long _mask = array_index_mask_nospec(_i, _s); \
+ unsigned long _mask = array_index_mask_nospec_check(_i, _s); \
\
BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \
BUILD_BUG_ON(sizeof(_s) > sizeof(long)); \
Patches currently in stable-queue which might be from will.deacon(a)arm.com are
queue-4.15/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.15/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
This is a note to let you know that I've just added the patch titled
gfs2: Fixes to "Implement iomap for block_map"
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
gfs2-fixes-to-implement-iomap-for-block_map.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 49edd5bf429c405b3a7f75503845d9f66a47dd4b Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba(a)redhat.com>
Date: Tue, 6 Feb 2018 07:20:55 -0700
Subject: gfs2: Fixes to "Implement iomap for block_map"
From: Andreas Gruenbacher <agruenba(a)redhat.com>
commit 49edd5bf429c405b3a7f75503845d9f66a47dd4b upstream.
It turns out that commit 3974320ca6 "Implement iomap for block_map"
introduced a few bugs that trigger occasional failures with xfstest
generic/476:
In gfs2_iomap_begin, we jump to do_alloc when we determine that we are
beyond the end of the allocated metadata (height > ip->i_height).
There, we can end up calling hole_size with a metapath that doesn't
match the current metadata tree, which doesn't make sense. After
untangling the code at do_alloc, fix this by checking if the block we
are looking for is within the range of allocated metadata.
In addition, add a BUG() in case gfs2_iomap_begin is accidentally called
for reading stuffed files: this is handled separately. Make sure we
don't truncate iomap->length for reads beyond the end of the file; in
that case, the entire range counts as a hole.
Finally, revert to taking a bitmap write lock when doing allocations.
It's unclear why that change didn't lead to any failures during testing.
Signed-off-by: Andreas Gruenbacher <agruenba(a)redhat.com>
Signed-off-by: Bob Peterson <rpeterso(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
fs/gfs2/bmap.c | 43 +++++++++++++++++++++++--------------------
1 file changed, 23 insertions(+), 20 deletions(-)
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -736,7 +736,7 @@ int gfs2_iomap_begin(struct inode *inode
__be64 *ptr;
sector_t lblock;
sector_t lend;
- int ret;
+ int ret = 0;
int eob;
unsigned int len;
struct buffer_head *bh;
@@ -748,12 +748,14 @@ int gfs2_iomap_begin(struct inode *inode
goto out;
}
- if ((flags & IOMAP_REPORT) && gfs2_is_stuffed(ip)) {
- gfs2_stuffed_iomap(inode, iomap);
- if (pos >= iomap->length)
- return -ENOENT;
- ret = 0;
- goto out;
+ if (gfs2_is_stuffed(ip)) {
+ if (flags & IOMAP_REPORT) {
+ gfs2_stuffed_iomap(inode, iomap);
+ if (pos >= iomap->length)
+ ret = -ENOENT;
+ goto out;
+ }
+ BUG_ON(!(flags & IOMAP_WRITE));
}
lblock = pos >> inode->i_blkbits;
@@ -764,7 +766,7 @@ int gfs2_iomap_begin(struct inode *inode
iomap->type = IOMAP_HOLE;
iomap->length = (u64)(lend - lblock) << inode->i_blkbits;
iomap->flags = IOMAP_F_MERGED;
- bmap_lock(ip, 0);
+ bmap_lock(ip, flags & IOMAP_WRITE);
/*
* Directory data blocks have a struct gfs2_meta_header header, so the
@@ -807,27 +809,28 @@ int gfs2_iomap_begin(struct inode *inode
iomap->flags |= IOMAP_F_BOUNDARY;
iomap->length = (u64)len << inode->i_blkbits;
- ret = 0;
-
out_release:
release_metapath(&mp);
- bmap_unlock(ip, 0);
+ bmap_unlock(ip, flags & IOMAP_WRITE);
out:
trace_gfs2_iomap_end(ip, iomap, ret);
return ret;
do_alloc:
- if (!(flags & IOMAP_WRITE)) {
- if (pos >= i_size_read(inode)) {
+ if (flags & IOMAP_WRITE) {
+ ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+ } else if (flags & IOMAP_REPORT) {
+ loff_t size = i_size_read(inode);
+ if (pos >= size)
ret = -ENOENT;
- goto out_release;
- }
- ret = 0;
- iomap->length = hole_size(inode, lblock, &mp);
- goto out_release;
+ else if (height <= ip->i_height)
+ iomap->length = hole_size(inode, lblock, &mp);
+ else
+ iomap->length = size - pos;
+ } else {
+ if (height <= ip->i_height)
+ iomap->length = hole_size(inode, lblock, &mp);
}
-
- ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
goto out_release;
}
Patches currently in stable-queue which might be from agruenba(a)redhat.com are
queue-4.15/gfs2-fixes-to-implement-iomap-for-block_map.patch
This is a note to let you know that I've just added the patch titled
x86/speculation: Add <asm/msr-index.h> dependency
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-speculation-add-asm-msr-index.h-dependency.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From ea00f301285ea2f07393678cd2b6057878320c9d Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz(a)infradead.org>
Date: Tue, 13 Feb 2018 14:28:19 +0100
Subject: x86/speculation: Add <asm/msr-index.h> dependency
From: Peter Zijlstra <peterz(a)infradead.org>
commit ea00f301285ea2f07393678cd2b6057878320c9d upstream.
Joe Konno reported a compile failure resulting from using an MSR
without inclusion of <asm/msr-index.h>, and while the current code builds
fine (by accident) this needs fixing for future patches.
Reported-by: Joe Konno <joe.konno(a)linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: arjan(a)linux.intel.com
Cc: bp(a)alien8.de
Cc: dan.j.williams(a)intel.com
Cc: dave.hansen(a)linux.intel.com
Cc: dwmw2(a)infradead.org
Cc: dwmw(a)amazon.co.uk
Cc: gregkh(a)linuxfoundation.org
Cc: hpa(a)zytor.com
Cc: jpoimboe(a)redhat.com
Cc: linux-tip-commits(a)vger.kernel.org
Cc: luto(a)kernel.org
Fixes: 20ffa1caecca ("x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support")
Link: http://lkml.kernel.org/r/20180213132819.GJ25201@hirez.programming.kicks-ass…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/nospec-branch.h | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -6,6 +6,7 @@
#include <asm/alternative.h>
#include <asm/alternative-asm.h>
#include <asm/cpufeatures.h>
+#include <asm/msr-index.h>
#ifdef __ASSEMBLY__
Patches currently in stable-queue which might be from peterz(a)infradead.org are
queue-4.14/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.14/x86-spectre-fix-an-error-message.patch
queue-4.14/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.14/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.14/x86-entry-64-remove-the-unused-icebp-macro.patch
queue-4.14/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.14/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.14/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.14/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.14/x86-cpu-rename-cpu_data.x86_mask-to-cpu_data.x86_stepping.patch
queue-4.14/selftests-x86-disable-tests-requiring-32-bit-support-on-pure-64-bit-systems.patch
queue-4.14/x86-debug-use-ud2-for-warn.patch
queue-4.14/x86-entry-64-fix-paranoid_entry-frame-pointer-warning.patch
queue-4.14/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
queue-4.14/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.14/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.14/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.14/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.14/selftests-x86-do-not-rely-on-int-0x80-in-single_step_syscall.c.patch
queue-4.14/selftests-x86-mpx-fix-incorrect-bounds-with-old-_sigfault.patch
queue-4.14/selftests-x86-fix-vdso-selftest-segfault-for-vsyscall-none.patch
queue-4.14/x86-debug-objtool-annotate-warn-related-ud2-as-reachable.patch
queue-4.14/objtool-fix-segfault-in-ignore_unreachable_insn.patch
queue-4.14/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.14/selftests-x86-pkeys-remove-unused-functions.patch
queue-4.14/selftests-x86-clean-up-and-document-sscanf-usage.patch
queue-4.14/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.14/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.14/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.14/selftests-x86-do-not-rely-on-int-0x80-in-test_mremap_vdso.c.patch
queue-4.14/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.14/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.14/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.14/x86-kexec-make-kexec-mostly-work-in-5-level-paging-mode.patch
queue-4.14/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.14/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.14/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.14/x86-mm-rename-flush_tlb_single-and-flush_tlb_one-to-__flush_tlb_one_.patch
queue-4.14/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch
This is a note to let you know that I've just added the patch titled
x86/spectre: Fix an error message
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-spectre-fix-an-error-message.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 9de29eac8d2189424d81c0d840cd0469aa3d41c8 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter(a)oracle.com>
Date: Wed, 14 Feb 2018 10:14:17 +0300
Subject: x86/spectre: Fix an error message
From: Dan Carpenter <dan.carpenter(a)oracle.com>
commit 9de29eac8d2189424d81c0d840cd0469aa3d41c8 upstream.
If i == ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.
Signed-off-by: Dan Carpenter <dan.carpenter(a)oracle.com>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Borislav Petkov <bp(a)suse.de>
Cc: David Woodhouse <dwmw(a)amazon.co.uk>
Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Cc: KarimAllah Ahmed <karahmed(a)amazon.de>
Cc: Linus Torvalds <torvalds(a)linux-foundation.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: kernel-janitors(a)vger.kernel.org
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Link: http://lkml.kernel.org/r/20180214071416.GA26677@mwanda
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -174,7 +174,7 @@ static enum spectre_v2_mitigation_cmd __
}
if (i >= ARRAY_SIZE(mitigation_options)) {
- pr_err("unknown option (%s). Switching to AUTO select\n", mitigation_options[i].option);
+ pr_err("unknown option (%s). Switching to AUTO select\n", arg);
return SPECTRE_V2_CMD_AUTO;
}
}
Patches currently in stable-queue which might be from dan.carpenter(a)oracle.com are
queue-4.14/x86-spectre-fix-an-error-message.patch
This is a note to let you know that I've just added the patch titled
x86/speculation: Fix up array_index_nospec_mask() asm constraint
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
The filename of the patch is:
x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams(a)intel.com>
Date: Tue, 6 Feb 2018 18:22:40 -0800
Subject: x86/speculation: Fix up array_index_nospec_mask() asm constraint
From: Dan Williams <dan.j.williams(a)intel.com>
commit be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470 upstream.
Allow the compiler to handle @size as an immediate value or memory
directly rather than allocating a register.
Reported-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams(a)intel.com>
Cc: Andy Lutomirski <luto(a)kernel.org>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Link: http://lkml.kernel.org/r/151797010204.1289.1510000292250184993.stgit@dwilli…
Signed-off-by: Ingo Molnar <mingo(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/barrier.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -40,7 +40,7 @@ static inline unsigned long array_index_
asm ("cmp %1,%2; sbb %0,%0;"
:"=r" (mask)
- :"r"(size),"r" (index)
+ :"g"(size),"r" (index)
:"cc");
return mask;
}
Patches currently in stable-queue which might be from dan.j.williams(a)intel.com are
queue-4.14/x86-entry-64-interleave-xor-register-clearing-with-push-instructions.patch
queue-4.14/nospec-move-array_index_nospec-parameter-checking-into-separate-macro.patch
queue-4.14/x86-entry-64-merge-the-pop_c_regs-and-pop_extra_regs-macros-into-a-single-pop_regs-macro.patch
queue-4.14/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.14/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.14/x86-speculation-add-asm-msr-index.h-dependency.patch
queue-4.14/x86-entry-64-use-push_and_clean_regs-in-more-cases.patch
queue-4.14/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.14/x86-entry-64-clear-registers-for-exceptions-interrupts-to-reduce-speculation-attack-surface.patch
queue-4.14/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.14/x86-entry-64-merge-save_c_regs-and-save_extra_regs-remove-unused-extensions.patch
queue-4.14/x86-entry-64-indent-push_and_clear_regs-and-pop_regs-properly.patch
queue-4.14/x86-speculation-fix-up-array_index_nospec_mask-asm-constraint.patch
queue-4.14/x86-entry-64-clear-extra-registers-beyond-syscall-arguments-to-reduce-speculation-attack-surface.patch
queue-4.14/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.14/x86-mm-pti-fix-pti-comment-in-entry_syscall_64.patch
queue-4.14/x86-entry-64-get-rid-of-the-alloc_pt_gpregs_on_stack-and-save_and_clear_regs-macros.patch
queue-4.14/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.14/x86-entry-64-introduce-the-push_and_clean_regs-macro.patch
queue-4.14/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch
queue-4.14/x86-entry-64-compat-clear-registers-for-compat-syscalls-to-reduce-speculation-attack-surface.patch
queue-4.14/x86-entry-64-fix-cr3-restore-in-paranoid_exit.patch