May 2019 - Linux-stable-mirror

[BACKPORT] xen/pvh: correctly setup the PV EFI interface for dom0

by Roger Pau Monne

commit 72813bfbf0276a97c82af038efb5f02dcdd9e310 upstream This involves initializing the boot params EFI related fields and the efi global variable. Without this fix a PVH dom0 doesn't detect when booted from EFI, and thus doesn't support accessing any of the EFI related data. Reported-by: PGNet Dev <pgnet.dev(a)gmail.com> Signed-off-by: Roger Pau Monné <roger.pau(a)citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky(a)oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky(a)oracle.com> Cc: stable(a)vger.kernel.org # 4.19+ --- arch/x86/xen/efi.c | 12 ++++++------ arch/x86/xen/enlighten_pv.c | 2 +- arch/x86/xen/enlighten_pvh.c | 4 ++++ arch/x86/xen/xen-ops.h | 4 ++-- 4 files changed, 13 insertions(+), 9 deletions(-) diff --git a/arch/x86/xen/efi.c b/arch/x86/xen/efi.c index 1804b27f9632..30edb9bc58e2 100644 --- a/arch/x86/xen/efi.c +++ b/arch/x86/xen/efi.c @@ -170,7 +170,7 @@ static enum efi_secureboot_mode xen_efi_get_secureboot(void) return efi_secureboot_mode_unknown; } -void __init xen_efi_init(void) +void __init xen_efi_init(struct boot_params *boot_params) { efi_system_table_t *efi_systab_xen; @@ -179,12 +179,12 @@ void __init xen_efi_init(void) if (efi_systab_xen == NULL) return; - strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen", - sizeof(boot_params.efi_info.efi_loader_signature)); - boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen); - boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); + strncpy((char *)&boot_params->efi_info.efi_loader_signature, "Xen", + sizeof(boot_params->efi_info.efi_loader_signature)); + boot_params->efi_info.efi_systab = (__u32)__pa(efi_systab_xen); + boot_params->efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); - boot_params.secure_boot = xen_efi_get_secureboot(); + boot_params->secure_boot = xen_efi_get_secureboot(); set_bit(EFI_BOOT, &efi.flags); set_bit(EFI_PARAVIRT, &efi.flags); diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 782f98b332f0..0f8da4aebe7b 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1399,7 +1399,7 @@ asmlinkage __visible void __init xen_start_kernel(void) /* We need this for printk timestamps */ xen_setup_runstate_info(0); - xen_efi_init(); + xen_efi_init(&boot_params); /* Start the world */ #ifdef CONFIG_X86_32 diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c index dab07827d25e..f04d22bcf08d 100644 --- a/arch/x86/xen/enlighten_pvh.c +++ b/arch/x86/xen/enlighten_pvh.c @@ -14,6 +14,8 @@ #include <xen/interface/memory.h> #include <xen/interface/hvm/start_info.h> +#include "xen-ops.h" + /* * PVH variables. * @@ -79,6 +81,8 @@ static void __init init_pvh_bootparams(void) pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */ x86_init.acpi.get_root_pointer = pvh_get_root_pointer; + + xen_efi_init(&pvh_bootparams); } /* diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 0e60bd918695..2f111f47ba98 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -122,9 +122,9 @@ static inline void __init xen_init_vga(const struct dom0_vga_console_info *info, void __init xen_init_apic(void); #ifdef CONFIG_XEN_EFI -extern void xen_efi_init(void); +extern void xen_efi_init(struct boot_params *boot_params); #else -static inline void __init xen_efi_init(void) +static inline void __init xen_efi_init(struct boot_params *boot_params) { } #endif -- 2.20.1 (Apple Git-117)

3 years, 10 months

3
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0 0

[PATCH 4.4 00/70] 4.4.165-stable review

by Greg Kroah-Hartman

This is the start of the stable review cycle for the 4.4.165 release. There are 70 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know. Responses should be made by Wed Nov 28 10:50:16 UTC 2018. Anything received after that time might be too late. The whole patch series can be found in one patch at: https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.4.165-rc… or in the git tree and branch at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y and the diffstat can be found below. thanks, greg k-h ------------- Pseudo-Shortlog of commits: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Linux 4.4.165-rc1 Eric Biggers <ebiggers(a)google.com> HID: uhid: forbid UHID_CREATE under KERNEL_DS or elevated privileges Al Viro <viro(a)zeniv.linux.org.uk> new helper: uaccess_kernel() Hans de Goede <hdegoede(a)redhat.com> ACPI / platform: Add SMB0001 HID to forbidden_id_list Gustavo A. R. Silva <gustavo(a)embeddedor.com> drivers/misc/sgi-gru: fix Spectre v1 vulnerability Mattias Jacobsson <2pi(a)mok.nu> USB: misc: appledisplay: add 20" Apple Cinema Display Nathan Chancellor <natechancellor(a)gmail.com> misc: atmel-ssc: Fix section annotation on atmel_ssc_get_driver_data Emmanuel Pescosta <emmanuelpescosta099(a)gmail.com> usb: quirks: Add delay-init quirk for Corsair K70 LUX RGB Kai-Heng Feng <kai.heng.feng(a)canonical.com> USB: quirks: Add no-lpm quirk for Raydium touchscreens Maarten Jacobs <maarten256(a)outlook.com> usb: cdc-acm: add entry for Hiro (Conexant) modem Dan Carpenter <dan.carpenter(a)oracle.com> uio: Fix an Oops on load Sakari Ailus <sakari.ailus(a)linux.intel.com> media: v4l: event: Add subscription to list before calling "add" operation Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Revert "Bluetooth: h5: Fix missing dependency on BT_HCIUART_SERDEV" Hans Verkuil <hverkuil(a)xs4all.nl> Revert "media: videobuf2-core: don't call memop 'finish' when queueing" Lu Fengqi <lufq.fnst(a)cn.fujitsu.com> btrfs: fix pinned underflow after transaction aborted Andreas Gruenbacher <agruenba(a)redhat.com> gfs2: Put bitmap buffers in put_super YueHaibing <yuehaibing(a)huawei.com> SUNRPC: drop pointless static qualifier in xdr_get_next_encode_buffer() Minchan Kim <minchan(a)kernel.org> zram: close udev startup race condition as default groups Vignesh R <vigneshr(a)ti.com> i2c: omap: Enable for ARCH_K3 Jeremy Linton <jeremy.linton(a)arm.com> lib/raid6: Fix arm64 test build Geert Uytterhoeven <geert(a)linux-m68k.org> hwmon: (ibmpowernv) Remove bogus __init annotations Taehee Yoo <ap420073(a)gmail.com> netfilter: xt_IDLETIMER: add sysfs filename checking routine Jozsef Kadlecsik <kadlec(a)blackhole.kfki.hu> netfilter: ipset: Correct rcu_dereference() call in ip_set_put_comment() Justin M. Forbes <jforbes(a)fedoraproject.org> s390/mm: Fix ERROR: "__node_distance" undefined! Eric Westbrook <eric(a)westbrook.io> netfilter: ipset: actually allow allowable CIDR 0 in hash:net,port,net Vasily Gorbik <gor(a)linux.ibm.com> s390/vdso: add missing FORCE to build targets Nathan Chancellor <natechancellor(a)gmail.com> arm64: percpu: Initialize ret in the default case Paul Gortmaker <paul.gortmaker(a)windriver.com> platform/x86: acerhdf: Add BIOS entry for Gateway LT31 v1.3307 Marek Szyprowski <m.szyprowski(a)samsung.com> clk: samsung: exynos5420: Enable PERIS clocks for suspend Chengguang Xu <cgxu519(a)gmx.com> fs/exofs: fix potential memory leak in mount option parsing Richard Weinberger <richard(a)nod.at> um: Give start_idle_thread() a return code Ernesto A. Fernández <ernesto.mnd.fernandez(a)gmail.com> hfsplus: prevent btree data loss on root split Ernesto A. Fernández <ernesto.mnd.fernandez(a)gmail.com> hfs: prevent btree data loss on root split Jann Horn <jannh(a)google.com> reiserfs: propagate errors from fill_with_dentries() properly Matthias Kaehlcke <mka(a)chromium.org> x86/build: Use cc-option to validate stack alignment parameter Matthias Kaehlcke <mka(a)chromium.org> x86/build: Fix stack alignment for CLang Michael Davidson <md(a)google.com> x86/boot: #undef memcpy() et al in string.c Matthias Kaehlcke <mka(a)chromium.org> x86/build: Specify stack alignment for clang Matthias Kaehlcke <mka(a)chromium.org> x86/build: Use __cc-option for boot code compiler options Matthias Kaehlcke <mka(a)chromium.org> kbuild: Add __cc-option macro Matthias Kaehlcke <mka(a)chromium.org> x86/mm/kaslr: Use the _ASM_MUL macro for multiplication to work around Clang incompatibility Michael Davidson <md(a)google.com> crypto, x86: aesni - fix token pasting for clang Matthias Kaehlcke <mka(a)chromium.org> x86/kbuild: Use cc-option to enable -falign-{jumps/loops} Matthias Kaehlcke <mka(a)chromium.org> arm64: Disable asm-operand-width warning for clang Stefan Agner <stefan(a)agner.ch> kbuild: allow to use GCC toolchain not in Clang search path Stefan Agner <stefan(a)agner.ch> kbuild: set no-integrated-as before incl. arch Makefile Sodagudi Prasad <psodagud(a)codeaurora.org> kbuild: clang: disable unused variable warnings only when constant Nick Desaulniers <nick.desaulniers(a)gmail.com> kbuild: clang: remove crufty HOSTCFLAGS David Lin <dtwlin(a)google.com> kbuild: clang: fix build failures with sparse check Masahiro Yamada <yamada.masahiro(a)socionext.com> kbuild: move cc-option and cc-disable-warning after incl. arch Makefile Chris Fries <cfries(a)google.com> kbuild: Set KBUILD_CFLAGS before incl. arch Makefile Nick Desaulniers <ndesaulniers(a)google.com> kbuild: fix linker feature test macros when cross compiling with Clang Ard Biesheuvel <ard.biesheuvel(a)linaro.org> efi/libstub/arm64: Set -fpie when building the EFI stub Ard Biesheuvel <ard.biesheuvel(a)linaro.org> efi/libstub/arm64: Force 'hidden' visibility for section markers Ard Biesheuvel <ard.biesheuvel(a)linaro.org> crypto: arm64/sha - avoid non-standard inline asm tricks Matthias Kaehlcke <mka(a)chromium.org> kbuild: clang: Disable 'address-of-packed-member' warning Arnd Bergmann <arnd(a)arndb.de> modules: mark __inittest/__exittest as __maybe_unused Vinícius Tinti <viniciustinti(a)gmail.com> kbuild: Add support to generate LLVM assembly files Behan Webster <behanw(a)converseincode.com> kbuild: use -Oz instead of -Os when using clang Mark Charlebois <charlebm(a)gmail.com> kbuild, LLVMLinux: Add -Werror to cc-option to support clang Masahiro Yamada <yamada.masahiro(a)socionext.com> kbuild: drop -Wno-unknown-warning-option from clang options Jeroen Hofstee <jeroen(a)myspectrum.nl> kbuild: fix asm-offset generation to work with clang Masahiro Yamada <yamada.masahiro(a)socionext.com> kbuild: consolidate redundant sed script ASM offset generation Matthias Kaehlcke <mka(a)chromium.org> kbuild: Consolidate header generation from ASM offset information Michael Davidson <md(a)google.com> kbuild: clang: add -no-integrated-as to KBUILD_[AC]FLAGS Behan Webster <behanw(a)converseincode.com> kbuild: Add better clang cross build support David Ahern <dsahern(a)gmail.com> ipv6: Fix PMTU updates for UDP/raw sockets in presence of VRF Siva Reddy Kallam <siva.kallam(a)broadcom.com> tg3: Add PHY reset for 5717/5719/5720 in change ring and flow control paths Eric Dumazet <edumazet(a)google.com> net-gro: reset skb->pkt_type in napi_reuse_skb() Sabrina Dubroca <sd(a)queasysnail.net> ip_tunnel: don't force DF when MTU is locked 배석진 <soukjin.bae(a)samsung.com> flow_dissector: do not dissect l4 ports for fragments ------------- Diffstat: .gitignore | 1 + Kbuild | 25 --------------- Makefile | 41 ++++++++++++++++-------- arch/arm64/Makefile | 4 +++ arch/arm64/crypto/sha1-ce-core.S | 6 ++-- arch/arm64/crypto/sha1-ce-glue.c | 11 ++----- arch/arm64/crypto/sha2-ce-core.S | 6 ++-- arch/arm64/crypto/sha2-ce-glue.c | 13 +++----- arch/arm64/include/asm/percpu.h | 3 ++ arch/ia64/kernel/Makefile | 26 ++-------------- arch/s390/kernel/vdso32/Makefile | 6 ++-- arch/s390/kernel/vdso64/Makefile | 6 ++-- arch/s390/numa/numa.c | 1 + arch/um/os-Linux/skas/process.c | 5 +++ arch/x86/Makefile | 39 +++++++++++++++++------ arch/x86/boot/compressed/aslr.c | 3 +- arch/x86/boot/string.c | 9 ++++++ arch/x86/crypto/aes_ctrby8_avx-x86_64.S | 7 ++--- arch/x86/include/asm/asm.h | 1 + drivers/acpi/acpi_platform.c | 1 + drivers/block/zram/zram_drv.c | 26 ++++------------ drivers/bluetooth/Kconfig | 1 - drivers/clk/samsung/clk-exynos5420.c | 1 + drivers/firmware/efi/libstub/Makefile | 2 +- drivers/firmware/efi/libstub/arm64-stub.c | 10 +++++- drivers/hid/uhid.c | 13 ++++++++ drivers/hwmon/ibmpowernv.c | 7 ++--- drivers/i2c/busses/Kconfig | 2 +- drivers/media/v4l2-core/v4l2-event.c | 43 ++++++++++++++------------ drivers/media/v4l2-core/videobuf2-core.c | 9 ++---- drivers/misc/atmel-ssc.c | 2 +- drivers/misc/sgi-gru/grukdump.c | 4 +++ drivers/net/ethernet/broadcom/tg3.c | 18 +++++++++-- drivers/platform/x86/acerhdf.c | 1 + drivers/uio/uio.c | 7 +++-- drivers/usb/class/cdc-acm.c | 3 ++ drivers/usb/core/quirks.c | 8 +++++ drivers/usb/misc/appledisplay.c | 1 + fs/btrfs/disk-io.c | 19 +++++++++--- fs/exofs/super.c | 5 ++- fs/gfs2/rgrp.c | 3 +- fs/hfs/brec.c | 4 +++ fs/hfsplus/brec.c | 4 +++ fs/reiserfs/xattr.c | 7 +++++ include/linux/kbuild.h | 6 ++-- include/linux/module.h | 4 +-- include/linux/netfilter/ipset/ip_set_comment.h | 4 +-- include/linux/uaccess.h | 3 ++ lib/raid6/test/Makefile | 4 +-- net/core/dev.c | 4 +++ net/core/flow_dissector.c | 4 +-- net/ipv4/ip_tunnel_core.c | 2 +- net/ipv6/route.c | 8 +++-- net/netfilter/ipset/ip_set_hash_netportnet.c | 8 ++--- net/netfilter/xt_IDLETIMER.c | 20 ++++++++++++ net/sunrpc/xdr.c | 2 +- scripts/Kbuild.include | 18 +++++++---- scripts/Makefile.build | 8 +++++ scripts/Makefile.extrawarn | 1 - scripts/Makefile.lib | 31 +++++++++++++++++++ scripts/mod/Makefile | 28 ++--------------- 61 files changed, 349 insertions(+), 220 deletions(-)

3 years, 11 months

9
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[PATCH] x86/mpx: fix recursive munmap() corruption

by Dave Hansen

This is a bit of a mess, to put it mildly. But, it's a bug that seems to have gone unticked up to now, probably because nobody uses MPX. The other alternative to this fix is to just deprecate MPX, even in -stable kernels. MPX has the arch_unmap() hook inside of munmap() because MPX uses bounds tables that protect other areas of memory. When memory is unmapped, there is also a need to unmap the MPX bounds tables. Barring this, unused bounds tables can eat 80% of the address space. But, the recursive do_munmap() that gets called vi arch_unmap() wreaks havoc with __do_munmap()'s state. It can result in freeing populated page tables, accessing bogus VMA state, double-freed VMAs and more. To fix this, call arch_unmap() before __do_unmap() has a chance to do anything meaningful. Also, remove the 'vma' argument and force the MPX code to do its own, independent VMA lookup. For the common success case this is functionally identical to what was there before. For the munmap() failure case, it's possible that some MPX tables will be zapped for memory that continues to be in use. But, this is an extraordinarily unlikely scenario and the harm would be that MPX provides no protection since the bounds table got reset (zeroed). I can't imagine anyone doing this: ptr = mmap(); // use ptr ret = munmap(ptr); if (ret) // oh, there was an error, I'll // keep using ptr. Because if you're doing munmap(), you are *done* with the memory. There's probably no good data in there _anyway_. This passes the original reproducer from Richard Biener as well as the existing mpx selftests/. ==== The long story: munmap() has a couple of pieces: 1. Find the affected VMA(s) 2. Split the start/end one(s) if neceesary 3. Pull the VMAs out of the rbtree 4. Actually zap the memory via unmap_region(), including freeing page tables (or queueing them to be freed). 5. Fixup some of the accounting (like fput()) and actually free the VMA itself. I decided to put the arch_unmap() call right afer #3. This was *just* before mmap_sem looked like it might get downgraded (it won't in this context), but it looked right. It wasn't. Richard Biener reported a test that shows this in dmesg: [1216548.787498] BUG: Bad rss-counter state mm:0000000017ce560b idx:1 val:551 [1216548.787500] BUG: non-zero pgtables_bytes on freeing mm: 24576 What triggered this was the recursive do_munmap() called via arch_unmap(). It was freeing page tables that has not been properly zapped. But, the problem was bigger than this. For one, arch_unmap() can free VMAs. But, the calling __do_munmap() has variables that *point* to VMAs and obviously can't handle them just getting freed while the pointer is still valid. I tried a couple of things here. First, I tried to fix the page table freeing problem in isolation, but I then found the VMA issue. I also tried having the MPX code return a flag if it modified the rbtree which would force __do_munmap() to re-walk to restart. That spiralled out of control in complexity pretty fast. Just moving arch_unmap() and accepting that the bonkers failure case might eat some bounds tables seems like the simplest viable fix. Reported-by: Richard Biener <rguenther(a)suse.de> Cc: Michal Hocko <mhocko(a)suse.com> Cc: Vlastimil Babka <vbabka(a)suse.cz> Cc: Andy Lutomirski <luto(a)amacapital.net> Cc: x86(a)kernel.org Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: linux-kernel(a)vger.kernel.org Cc: linux-mm(a)kvack.org Cc: stable(a)vger.kernel.org --- b/arch/x86/include/asm/mmu_context.h | 6 +++--- b/arch/x86/include/asm/mpx.h | 5 ++--- b/arch/x86/mm/mpx.c | 10 ++++++---- b/include/asm-generic/mm_hooks.h | 1 - b/mm/mmap.c | 15 ++++++++------- 5 files changed, 19 insertions(+), 18 deletions(-) diff -puN mm/mmap.c~mpx-rss-pass-no-vma mm/mmap.c --- a/mm/mmap.c~mpx-rss-pass-no-vma 2019-04-01 06:56:53.409411123 -0700 +++ b/mm/mmap.c 2019-04-01 06:56:53.423411123 -0700 @@ -2731,9 +2731,17 @@ int __do_munmap(struct mm_struct *mm, un return -EINVAL; len = PAGE_ALIGN(len); + end = start + len; if (len == 0) return -EINVAL; + /* + * arch_unmap() might do unmaps itself. It must be called + * and finish any rbtree manipulation before this code + * runs and also starts to manipulate the rbtree. + */ + arch_unmap(mm, start, end); + /* Find the first overlapping VMA */ vma = find_vma(mm, start); if (!vma) @@ -2742,7 +2750,6 @@ int __do_munmap(struct mm_struct *mm, un /* we have start < vma->vm_end */ /* if it doesn't overlap, we have nothing.. */ - end = start + len; if (vma->vm_start >= end) return 0; @@ -2812,12 +2819,6 @@ int __do_munmap(struct mm_struct *mm, un /* Detach vmas from rbtree */ detach_vmas_to_be_unmapped(mm, vma, prev, end); - /* - * mpx unmap needs to be called with mmap_sem held for write. - * It is safe to call it before unmap_region(). - */ - arch_unmap(mm, vma, start, end); - if (downgrade) downgrade_write(&mm->mmap_sem); diff -puN arch/x86/include/asm/mmu_context.h~mpx-rss-pass-no-vma arch/x86/include/asm/mmu_context.h --- a/arch/x86/include/asm/mmu_context.h~mpx-rss-pass-no-vma 2019-04-01 06:56:53.412411123 -0700 +++ b/arch/x86/include/asm/mmu_context.h 2019-04-01 06:56:53.423411123 -0700 @@ -277,8 +277,8 @@ static inline void arch_bprm_mm_init(str mpx_mm_init(mm); } -static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long start, unsigned long end) +static inline void arch_unmap(struct mm_struct *mm, unsigned long start, + unsigned long end) { /* * mpx_notify_unmap() goes and reads a rarely-hot @@ -298,7 +298,7 @@ static inline void arch_unmap(struct mm_ * consistently wrong. */ if (unlikely(cpu_feature_enabled(X86_FEATURE_MPX))) - mpx_notify_unmap(mm, vma, start, end); + mpx_notify_unmap(mm, start, end); } /* diff -puN include/asm-generic/mm_hooks.h~mpx-rss-pass-no-vma include/asm-generic/mm_hooks.h --- a/include/asm-generic/mm_hooks.h~mpx-rss-pass-no-vma 2019-04-01 06:56:53.414411123 -0700 +++ b/include/asm-generic/mm_hooks.h 2019-04-01 06:56:53.423411123 -0700 @@ -18,7 +18,6 @@ static inline void arch_exit_mmap(struct } static inline void arch_unmap(struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long start, unsigned long end) { } diff -puN arch/x86/mm/mpx.c~mpx-rss-pass-no-vma arch/x86/mm/mpx.c --- a/arch/x86/mm/mpx.c~mpx-rss-pass-no-vma 2019-04-01 06:56:53.416411123 -0700 +++ b/arch/x86/mm/mpx.c 2019-04-01 06:56:53.423411123 -0700 @@ -881,9 +881,10 @@ static int mpx_unmap_tables(struct mm_st * the virtual address region start...end have already been split if * necessary, and the 'vma' is the first vma in this range (start -> end). */ -void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long start, unsigned long end) +void mpx_notify_unmap(struct mm_struct *mm, unsigned long start, + unsigned long end) { + struct vm_area_struct *vma; int ret; /* @@ -902,11 +903,12 @@ void mpx_notify_unmap(struct mm_struct * * which should not occur normally. Being strict about it here * helps ensure that we do not have an exploitable stack overflow. */ - do { + vma = find_vma(mm, start); + while (vma && vma->vm_start < end) { if (vma->vm_flags & VM_MPX) return; vma = vma->vm_next; - } while (vma && vma->vm_start < end); + } ret = mpx_unmap_tables(mm, start, end); if (ret) diff -puN arch/x86/include/asm/mpx.h~mpx-rss-pass-no-vma arch/x86/include/asm/mpx.h --- a/arch/x86/include/asm/mpx.h~mpx-rss-pass-no-vma 2019-04-01 06:56:53.418411123 -0700 +++ b/arch/x86/include/asm/mpx.h 2019-04-01 06:56:53.424411123 -0700 @@ -78,8 +78,8 @@ static inline void mpx_mm_init(struct mm */ mm->context.bd_addr = MPX_INVALID_BOUNDS_DIR; } -void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long start, unsigned long end); +void mpx_notify_unmap(struct mm_struct *mm, unsigned long start, + unsigned long end); unsigned long mpx_unmapped_area_check(unsigned long addr, unsigned long len, unsigned long flags); @@ -100,7 +100,6 @@ static inline void mpx_mm_init(struct mm { } static inline void mpx_notify_unmap(struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long start, unsigned long end) { } _

4 years

7
13
0 0

[PATCH] drm: avoid spurious EBUSY due to nonblocking atomic modesets

by Daniel Vetter

When doing an atomic modeset with ALLOW_MODESET drivers are allowed to pull in arbitrary other resources, including CRTCs (e.g. when reconfiguring global resources). But in nonblocking mode userspace has then no idea this happened, which can lead to spurious EBUSY calls, both: - when that other CRTC is currently busy doing a page_flip the ALLOW_MODESET commit can fail with an EBUSY - on the other CRTC a normal atomic flip can fail with EBUSY because of the additional commit inserted by the kernel without userspace's knowledge For blocking commits this isn't a problem, because everyone else will just block until all the CRTC are reconfigured. Only thing userspace can notice is the dropped frames without any reason for why frames got dropped. Consensus is that we need new uapi to handle this properly, but no one has any idea what exactly the new uapi should look like. As a stop-gap plug this problem by demoting nonblocking commits which might cause issues by including CRTCs not in the original request to blocking commits. v2: Add comments and a WARN_ON to enforce this only when allowed - we don't want to silently convert page flips into blocking plane updates just because the driver is buggy. References: https://lists.freedesktop.org/archives/dri-devel/2018-July/182281.html Bugzilla: https://gitlab.freedesktop.org/wayland/weston/issues/24#note_9568 Cc: Daniel Stone <daniel(a)fooishbar.org> Cc: Pekka Paalanen <pekka.paalanen(a)collabora.co.uk> Cc: stable(a)vger.kernel.org Signed-off-by: Daniel Vetter <daniel.vetter(a)intel.com> --- drivers/gpu/drm/drm_atomic.c | 34 +++++++++++++++++++++++++++++++--- 1 file changed, 31 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index d5cefb1cb2a2..058512f14772 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -2018,15 +2018,43 @@ EXPORT_SYMBOL(drm_atomic_commit); int drm_atomic_nonblocking_commit(struct drm_atomic_state *state) { struct drm_mode_config *config = &state->dev->mode_config; - int ret; + unsigned requested_crtc = 0; + unsigned affected_crtc = 0; + struct drm_crtc *crtc; + struct drm_crtc_state *crtc_state; + bool nonblocking = true; + int ret, i; + + /* + * For commits that allow modesets drivers can add other CRTCs to the + * atomic commit, e.g. when they need to reallocate global resources. + * + * But when userspace also requests a nonblocking commit then userspace + * cannot know that the commit affects other CRTCs, which can result in + * spurious EBUSY failures. Until we have better uapi plug this by + * demoting such commits to blocking mode. + */ + for_each_new_crtc_in_state(state, crtc, crtc_state, i) + requested_crtc |= drm_crtc_mask(crtc); ret = drm_atomic_check_only(state); if (ret) return ret; - DRM_DEBUG_ATOMIC("committing %p nonblocking\n", state); + for_each_new_crtc_in_state(state, crtc, crtc_state, i) + affected_crtc |= drm_crtc_mask(crtc); + + if (affected_crtc != requested_crtc) { + /* adding other CRTC is only allowed for modeset commits */ + WARN_ON(state->allow_modeset); + + DRM_DEBUG_ATOMIC("demoting %p to blocking mode to avoid EBUSY\n", state); + nonblocking = false; + } else { + DRM_DEBUG_ATOMIC("committing %p nonblocking\n", state); + } - return config->funcs->atomic_commit(state->dev, state, true); + return config->funcs->atomic_commit(state->dev, state, nonblocking); } EXPORT_SYMBOL(drm_atomic_nonblocking_commit); -- 2.18.0

4 years, 1 month

3
11
0 0

[PATCH] [Patch v2] usbtv: Fix refcounting mixup

by Oliver Neukum

The premature free in the error path is blocked by V4L refcounting, not USB refcounting. Thanks to Ben Hutchings for review. [v2] corrected attributions Signed-off-by: Oliver Neukum <oneukum(a)suse.com> Fixes: 50e704453553 ("media: usbtv: prevent double free in error case") CC: stable(a)vger.kernel.org Reported-by: Ben Hutchings <ben.hutchings(a)codethink.co.uk> --- drivers/media/usb/usbtv/usbtv-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/usbtv/usbtv-core.c b/drivers/media/usb/usbtv/usbtv-core.c index 5095c380b2c1..4a03c4d66314 100644 --- a/drivers/media/usb/usbtv/usbtv-core.c +++ b/drivers/media/usb/usbtv/usbtv-core.c @@ -113,7 +113,8 @@ static int usbtv_probe(struct usb_interface *intf, usbtv_audio_fail: /* we must not free at this point */ - usb_get_dev(usbtv->udev); + v4l2_device_get(&usbtv->v4l2_dev); + /* this will undo the v4l2_device_get() */ usbtv_video_free(usbtv); usbtv_video_fail: -- 2.13.6

4 years, 2 months

3
7
0 0

[PATCH 1/2] i2c: i801: Fix runtime PM

by Jarkko Nikula

Commit 9c8088c7988 ("i2c: i801: Don't restore config registers on runtime PM") nullified the runtime PM suspend/resume callback pointers while keeping the runtime PM enabled. This causes that device stays in D0 power state and sysfs /sys/bus/pci/devices/.../power/runtime_status shows "error" when runtime PM framework attempts to autosuspend the device. This is due PCI bus runtime PM which checks for driver runtime PM callbacks and returns with -ENOSYS if they are not set. Fix this by having a shared dummy runtime PM callback that returns with success. Fixes: a9c8088c7988 ("i2c: i801: Don't restore config registers on runtime PM") Reported-by: Mika Westerberg <mika.westerberg(a)linux.intel.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Jarkko Nikula <jarkko.nikula(a)linux.intel.com> --- drivers/i2c/busses/i2c-i801.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index aa726607645e..3747484c2669 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1731,7 +1731,20 @@ static int i801_resume(struct device *dev) } #endif -static SIMPLE_DEV_PM_OPS(i801_pm_ops, i801_suspend, i801_resume); +static int __maybe_unused i801_runtime_nop(struct device *dev) +{ + /* + * PCI core expects runtime PM suspend/resume callbacks return + * successfully before really suspending/resuming the device. + * Have a shared dummy callback that returns with success. + */ + return 0; +} + +static const struct dev_pm_ops i801_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(i801_suspend, i801_resume) + SET_RUNTIME_PM_OPS(i801_runtime_nop, i801_runtime_nop, NULL) +}; static struct pci_driver i801_driver = { .name = "i801_smbus", -- 2.18.0

4 years, 2 months

5
6
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[PATCH 4.9 00/22] 4.9.148-stable review

by Greg Kroah-Hartman

This is the start of the stable review cycle for the 4.9.148 release. There are 22 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know. Responses should be made by Sun Dec 30 11:31:00 UTC 2018. Anything received after that time might be too late. The whole patch series can be found in one patch at: https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.9.148-rc… or in the git tree and branch at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y and the diffstat can be found below. thanks, greg k-h ------------- Pseudo-Shortlog of commits: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Linux 4.9.148-rc1 Gustavo A. R. Silva <gustavo(a)embeddedor.com> drm/ioctl: Fix Spectre v1 vulnerabilities Ivan Delalande <colona(a)arista.com> proc/sysctl: don't return ENOMEM on lookup when a table is unregistering Sergey Senozhatsky <sergey.senozhatsky.work(a)gmail.com> panic: avoid deadlocks in re-entrant console drivers Richard Weinberger <richard(a)nod.at> ubifs: Handle re-linking of inodes correctly while recovery Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> x86/fpu: Disable bottom halves while loading FPU registers Colin Ian King <colin.king(a)canonical.com> x86/mtrr: Don't copy uninitialized gentry fields back to userspace Dexuan Cui <decui(a)microsoft.com> Drivers: hv: vmbus: Return -EINVAL for the sys files for unopened channels Christophe Leroy <christophe.leroy(a)c-s.fr> gpio: max7301: fix driver for use with CONFIG_VMAP_STACK Russell King <rmk+kernel(a)armlinux.org.uk> mmc: omap_hsmmc: fix DMA API warning Ulf Hansson <ulf.hansson(a)linaro.org> mmc: core: Use a minimum 1600ms timeout when enabling CACHE ctrl Ulf Hansson <ulf.hansson(a)linaro.org> mmc: core: Allow BKOPS and CACHE ctrl even if no HPI support Ulf Hansson <ulf.hansson(a)linaro.org> mmc: core: Reset HPI enabled state during re-init and in case of errors Jörgen Storvist <jorgen.storvist(a)gmail.com> USB: serial: option: add Telit LN940 series Jörgen Storvist <jorgen.storvist(a)gmail.com> USB: serial: option: add Fibocom NL668 series Jörgen Storvist <jorgen.storvist(a)gmail.com> USB: serial: option: add Simcom SIM7500/SIM7600 (MBIM mode) Tore Anderson <tore(a)fud.no> USB: serial: option: add HP lt4132 Jörgen Storvist <jorgen.storvist(a)gmail.com> USB: serial: option: add GosunCn ZTE WeLink ME3630 Mathias Nyman <mathias.nyman(a)linux.intel.com> xhci: Don't prevent USB2 bus suspend in state check intended for USB3 only Hui Peng <benquike(a)gmail.com> USB: hso: Fix OOB memory access in hso_probe/hso_get_config_data Bart Van Assche <bart.vanassche(a)wdc.com> ib_srpt: Fix a use-after-free in __srpt_close_all_ch() Mikulas Patocka <mpatocka(a)redhat.com> block: fix infinite loop if the device loses discard capability Jens Axboe <axboe(a)kernel.dk> block: break discard submissions into the user defined size ------------- Diffstat: Makefile | 4 ++-- arch/x86/kernel/cpu/mtrr/if.c | 2 ++ arch/x86/kernel/fpu/signal.c | 4 ++-- block/blk-lib.c | 22 ++++++++++++++++++--- drivers/gpio/gpio-max7301.c | 12 +++--------- drivers/gpu/drm/drm_ioctl.c | 10 ++++++++-- drivers/hv/vmbus_drv.c | 20 +++++++++++++++++++ drivers/infiniband/ulp/srpt/ib_srpt.c | 4 ++-- drivers/mmc/core/mmc.c | 24 ++++++++++++++--------- drivers/mmc/host/omap_hsmmc.c | 12 +++++++++++- drivers/net/usb/hso.c | 18 +++++++++++++++-- drivers/usb/host/xhci-hub.c | 3 ++- drivers/usb/serial/option.c | 16 ++++++++++++++- fs/proc/proc_sysctl.c | 13 ++++++------ fs/ubifs/replay.c | 37 +++++++++++++++++++++++++++++++++++ kernel/panic.c | 6 +++++- 16 files changed, 165 insertions(+), 42 deletions(-)

4 years, 4 months

6
28
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[PATCH] libata: Return correct rc status in sata_pmp_eh_recover_pm() pwhen ATA_DFLAG_DETACH is set

by Kai-Heng Feng

During system resume from suspend, this can be observed on ASM1062 PMP controller: <6>[12007.593358] ata10.01: SATA link down (SStatus 0 SControl 330) <6>[12007.593469] ata10.02: hard resetting link <6>[12007.908353] ata10.02: SATA link down (SStatus 0 SControl 330) <6>[12007.911149] ata10.00: configured for UDMA/133 <0>[12007.972508] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: sata_pmp_eh_recover+0xa2b/0xa40 <0>[12007.972508] <4>[12007.972515] CPU: 2 PID: 230 Comm: scsi_eh_9 Tainted: P OE 4.15.0-46-generic #49-Ubuntu <4>[12007.972517] Hardware name: System manufacturer System Product Name/A320M-C, BIOS 1001 12/10/2017 <4>[12007.972518] Call Trace: <4>[12007.972525] dump_stack+0x63/0x8b <4>[12007.972530] panic+0xe4/0x244 <4>[12007.972533] ? sata_pmp_eh_recover+0xa2b/0xa40 <4>[12007.972536] __stack_chk_fail+0x19/0x20 <4>[12007.972538] sata_pmp_eh_recover+0xa2b/0xa40 <4>[12007.972543] ? ahci_do_softreset+0x260/0x260 [libahci] <4>[12007.972545] ? ahci_do_hardreset+0x140/0x140 [libahci] <4>[12007.972547] ? ata_phys_link_offline+0x60/0x60 <4>[12007.972549] ? ahci_stop_engine+0xc0/0xc0 [libahci] <4>[12007.972552] sata_pmp_error_handler+0x22/0x30 <4>[12007.972554] ahci_error_handler+0x45/0x80 [libahci] <4>[12007.972556] ata_scsi_port_error_handler+0x29b/0x770 <4>[12007.972558] ? ata_scsi_cmd_error_handler+0x101/0x140 <4>[12007.972559] ata_scsi_error+0x95/0xd0 <4>[12007.972562] ? scsi_try_target_reset+0x90/0x90 <4>[12007.972563] scsi_error_handler+0xd0/0x5b0 <4>[12007.972566] kthread+0x121/0x140 <4>[12007.972567] ? scsi_eh_get_sense+0x200/0x200 <4>[12007.972569] ? kthread_create_worker_on_cpu+0x70/0x70 <4>[12007.972572] ret_from_fork+0x22/0x40 <0>[12007.972591] Kernel Offset: 0xcc00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Since sata_pmp_eh_recover_pmp() doens't set rc when ATA_DFLAG_DETACH is set, sata_pmp_eh_recover() continues to run. During retry it triggers the stack protector. Set correct rc in sata_pmp_eh_recover_pmp() to let sata_pmp_eh_recover() jump to pmp_fail directly. BugLink: https://bugs.launchpad.net/bugs/1821434 Cc: stable(a)vger.kernel.org Signed-off-by: Kai-Heng Feng <kai.heng.feng(a)canonical.com> --- drivers/ata/libata-pmp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c index 2ae1799f4992..51eeaea65833 100644 --- a/drivers/ata/libata-pmp.c +++ b/drivers/ata/libata-pmp.c @@ -764,6 +764,7 @@ static int sata_pmp_eh_recover_pmp(struct ata_port *ap, if (dev->flags & ATA_DFLAG_DETACH) { detach = 1; + rc = -ENODEV; goto fail; } -- 2.17.1

4 years, 7 months

3
3
0 0

[PATCH] loop: avoid EAGAIN, if offset or block_size are changed

by Jaegeuk Kim

This patch tries to avoid EAGAIN due to nrpages!=0 that was originally trying to drop stale pages resulting in wrong data access. Report: https://bugs.chromium.org/p/chromium/issues/detail?id=938958#c38 Cc: <stable(a)vger.kernel.org> Cc: Jens Axboe <axboe(a)kernel.dk> Cc: linux-block(a)vger.kernel.org Cc: Bart Van Assche <bvanassche(a)acm.org> Fixes: 5db470e229e2 ("loop: drop caches if offset or block_size are changed") Reported-by: Gwendal Grignou <gwendal(a)chromium.org> Reported-by: grygorii tertychnyi <gtertych(a)cisco.com> Signed-off-by: Jaegeuk Kim <jaegeuk(a)kernel.org> --- drivers/block/loop.c | 44 +++++++++++++++++--------------------------- 1 file changed, 17 insertions(+), 27 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 102d79575895..7c7d2d9c47d0 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1212,6 +1212,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) kuid_t uid = current_uid(); struct block_device *bdev; bool partscan = false; + bool drop_caches = false; err = mutex_lock_killable(&loop_ctl_mutex); if (err) @@ -1232,10 +1233,8 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) } if (lo->lo_offset != info->lo_offset || - lo->lo_sizelimit != info->lo_sizelimit) { - sync_blockdev(lo->lo_device); - kill_bdev(lo->lo_device); - } + lo->lo_sizelimit != info->lo_sizelimit) + drop_caches = true; /* I/O need to be drained during transfer transition */ blk_mq_freeze_queue(lo->lo_queue); @@ -1265,14 +1264,6 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) if (lo->lo_offset != info->lo_offset || lo->lo_sizelimit != info->lo_sizelimit) { - /* kill_bdev should have truncated all the pages */ - if (lo->lo_device->bd_inode->i_mapping->nrpages) { - err = -EAGAIN; - pr_warn("%s: loop%d (%s) has still dirty pages (nrpages=%lu)\n", - __func__, lo->lo_number, lo->lo_file_name, - lo->lo_device->bd_inode->i_mapping->nrpages); - goto out_unfreeze; - } if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit)) { err = -EFBIG; goto out_unfreeze; @@ -1317,6 +1308,12 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) bdev = lo->lo_device; partscan = true; } + + /* truncate stale pages cached by previous operations */ + if (!err && drop_caches) { + sync_blockdev(lo->lo_device); + kill_bdev(lo->lo_device); + } out_unlock: mutex_unlock(&loop_ctl_mutex); if (partscan) @@ -1498,6 +1495,7 @@ static int loop_set_dio(struct loop_device *lo, unsigned long arg) static int loop_set_block_size(struct loop_device *lo, unsigned long arg) { + bool drop_caches = false; int err = 0; if (lo->lo_state != Lo_bound) @@ -1506,23 +1504,10 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg) if (arg < 512 || arg > PAGE_SIZE || !is_power_of_2(arg)) return -EINVAL; - if (lo->lo_queue->limits.logical_block_size != arg) { - sync_blockdev(lo->lo_device); - kill_bdev(lo->lo_device); - } + if (lo->lo_queue->limits.logical_block_size != arg) + drop_caches = true; blk_mq_freeze_queue(lo->lo_queue); - - /* kill_bdev should have truncated all the pages */ - if (lo->lo_queue->limits.logical_block_size != arg && - lo->lo_device->bd_inode->i_mapping->nrpages) { - err = -EAGAIN; - pr_warn("%s: loop%d (%s) has still dirty pages (nrpages=%lu)\n", - __func__, lo->lo_number, lo->lo_file_name, - lo->lo_device->bd_inode->i_mapping->nrpages); - goto out_unfreeze; - } - blk_queue_logical_block_size(lo->lo_queue, arg); blk_queue_physical_block_size(lo->lo_queue, arg); blk_queue_io_min(lo->lo_queue, arg); @@ -1530,6 +1515,11 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg) out_unfreeze: blk_mq_unfreeze_queue(lo->lo_queue); + /* truncate stale pages cached by previous operations */ + if (drop_caches) { + sync_blockdev(lo->lo_device); + kill_bdev(lo->lo_device); + } return err; } -- 2.19.0.605.g01d371f741-goog

4 years, 8 months

6
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[PATCH] jffs2: Fix integer underflow in jffs2_rtime_compress

by Richard Weinberger

The rtime compressor assumes that at least two bytes are compressed. If we try to compress just one byte, the loop condition will wrap around and an out-of-bounds write happens. Cc: <stable(a)vger.kernel.org> Signed-off-by: Richard Weinberger <richard(a)nod.at> --- fs/jffs2/compr_rtime.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/jffs2/compr_rtime.c b/fs/jffs2/compr_rtime.c index 406d9cc84ba8..cbf700001fc9 100644 --- a/fs/jffs2/compr_rtime.c +++ b/fs/jffs2/compr_rtime.c @@ -39,6 +39,9 @@ static int jffs2_rtime_compress(unsigned char *data_in, memset(positions,0,sizeof(positions)); + if (*dstlen < 2) + return -1; + while (pos < (*sourcelen) && outpos <= (*dstlen)-2) { int backpos, runlen=0; unsigned char value; -- 2.20.0

4 years, 10 months

2
3
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Linux-stable-mirror May 2019