On Sat, Oct 10, 2020 at 04:41:09PM +0800, yangerkun wrote:
> ?? 2020/6/16 9:56, Sasha Levin ????:
> > This is a note to let you know that I've just added the patch titled
> >
> > spi: Fix controller unregister order
> >
> > to the 4.4-stable tree which can be found at:
[...]
> > --- a/drivers/spi/spi.c
> > +++ b/drivers/spi/spi.c
> > @@ -1922,11 +1922,12 @@ void spi_unregister_master(struct spi_master *master)
> > dev_err(&master->dev, "queue remove failed\n");
> > }
> > + device_for_each_child(&master->dev, NULL, __unregister);
> > +
>
> This is a wrong patch. We should move this line before
> spi_destroy_queue, but we didn't. 4.9 stable exists this
> problem too.
Hi Sasha, Hi Greg,
below please find a patch for the 4.9-stable tree to fix the backporting
issue reported above.
Thanks!
-- >8 --
Subject: [PATCH] spi: Fix controller unregister order harder
Commit c7e41e1caa71 sought to backport upstream commit 84855678add8 to
the 4.9-stable tree but erroneously inserted a line at the wrong place.
Fix it.
Fixes: c7e41e1caa71 ("spi: Fix controller unregister order")
Reported-by: yangerkun <yangerkun(a)huawei.com>
Signed-off-by: Lukas Wunner <lukas(a)wunner.de>
---
drivers/spi/spi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index c7c9ca3178ad..e0632ee1723b 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2070,13 +2070,13 @@ static int __unregister(struct device *dev, void *null)
*/
void spi_unregister_master(struct spi_master *master)
{
+ device_for_each_child(&master->dev, NULL, __unregister);
+
if (master->queued) {
if (spi_destroy_queue(master))
dev_err(&master->dev, "queue remove failed\n");
}
- device_for_each_child(&master->dev, NULL, __unregister);
-
mutex_lock(&board_lock);
list_del(&master->list);
mutex_unlock(&board_lock);
--
2.29.2
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 4e9a5ae8df5b3365183150f6df49e49dece80d8c
Gitweb: https://git.kernel.org/tip/4e9a5ae8df5b3365183150f6df49e49dece80d8c
Author: Masami Hiramatsu <mhiramat(a)kernel.org>
AuthorDate: Thu, 03 Dec 2020 13:50:37 +09:00
Committer: Borislav Petkov <bp(a)suse.de>
CommitterDate: Sun, 06 Dec 2020 09:58:13 +01:00
x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes
Since insn.prefixes.nbytes can be bigger than the size of
insn.prefixes.bytes[] when a prefix is repeated, the proper check must
be
insn.prefixes.bytes[i] != 0 and i < 4
instead of using insn.prefixes.nbytes.
Introduce a for_each_insn_prefix() macro for this purpose. Debugged by
Kees Cook <keescook(a)chromium.org>.
[ bp: Massage commit message, sync with the respective header in tools/
and drop "we". ]
Fixes: 2b1444983508 ("uprobes, mm, x86: Add the ability to install and remove uprobes breakpoints")
Reported-by: syzbot+9b64b619f10f19d19a7c(a)syzkaller.appspotmail.com
Signed-off-by: Masami Hiramatsu <mhiramat(a)kernel.org>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
Reviewed-by: Srikar Dronamraju <srikar(a)linux.vnet.ibm.com>
Cc: stable(a)vger.kernel.org
Link: https://lkml.kernel.org/r/160697103739.3146288.7437620795200799020.stgit@de…
---
arch/x86/include/asm/insn.h | 15 +++++++++++++++
arch/x86/kernel/uprobes.c | 10 ++++++----
tools/arch/x86/include/asm/insn.h | 15 +++++++++++++++
3 files changed, 36 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h
index 5c1ae3e..a8c3d28 100644
--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -201,6 +201,21 @@ static inline int insn_offset_immediate(struct insn *insn)
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
+/**
+ * for_each_insn_prefix() -- Iterate prefixes in the instruction
+ * @insn: Pointer to struct insn.
+ * @idx: Index storage.
+ * @prefix: Prefix byte.
+ *
+ * Iterate prefix bytes of given @insn. Each prefix byte is stored in @prefix
+ * and the index is stored in @idx (note that this @idx is just for a cursor,
+ * do not change it.)
+ * Since prefixes.nbytes can be bigger than 4 if some prefixes
+ * are repeated, it cannot be used for looping over the prefixes.
+ */
+#define for_each_insn_prefix(insn, idx, prefix) \
+ for (idx = 0; idx < ARRAY_SIZE(insn->prefixes.bytes) && (prefix = insn->prefixes.bytes[idx]) != 0; idx++)
+
#define POP_SS_OPCODE 0x1f
#define MOV_SREG_OPCODE 0x8e
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 3fdaa04..138bdb1 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -255,12 +255,13 @@ static volatile u32 good_2byte_insns[256 / 32] = {
static bool is_prefix_bad(struct insn *insn)
{
+ insn_byte_t p;
int i;
- for (i = 0; i < insn->prefixes.nbytes; i++) {
+ for_each_insn_prefix(insn, i, p) {
insn_attr_t attr;
- attr = inat_get_opcode_attribute(insn->prefixes.bytes[i]);
+ attr = inat_get_opcode_attribute(p);
switch (attr) {
case INAT_MAKE_PREFIX(INAT_PFX_ES):
case INAT_MAKE_PREFIX(INAT_PFX_CS):
@@ -715,6 +716,7 @@ static const struct uprobe_xol_ops push_xol_ops = {
static int branch_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
{
u8 opc1 = OPCODE1(insn);
+ insn_byte_t p;
int i;
switch (opc1) {
@@ -746,8 +748,8 @@ static int branch_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
* Intel and AMD behavior differ in 64-bit mode: Intel ignores 66 prefix.
* No one uses these insns, reject any branch insns with such prefix.
*/
- for (i = 0; i < insn->prefixes.nbytes; i++) {
- if (insn->prefixes.bytes[i] == 0x66)
+ for_each_insn_prefix(insn, i, p) {
+ if (p == 0x66)
return -ENOTSUPP;
}
diff --git a/tools/arch/x86/include/asm/insn.h b/tools/arch/x86/include/asm/insn.h
index 568854b..52c6262 100644
--- a/tools/arch/x86/include/asm/insn.h
+++ b/tools/arch/x86/include/asm/insn.h
@@ -201,6 +201,21 @@ static inline int insn_offset_immediate(struct insn *insn)
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
+/**
+ * for_each_insn_prefix() -- Iterate prefixes in the instruction
+ * @insn: Pointer to struct insn.
+ * @idx: Index storage.
+ * @prefix: Prefix byte.
+ *
+ * Iterate prefix bytes of given @insn. Each prefix byte is stored in @prefix
+ * and the index is stored in @idx (note that this @idx is just for a cursor,
+ * do not change it.)
+ * Since prefixes.nbytes can be bigger than 4 if some prefixes
+ * are repeated, it cannot be used for looping over the prefixes.
+ */
+#define for_each_insn_prefix(insn, idx, prefix) \
+ for (idx = 0; idx < ARRAY_SIZE(insn->prefixes.bytes) && (prefix = insn->prefixes.bytes[idx]) != 0; idx++)
+
#define POP_SS_OPCODE 0x1f
#define MOV_SREG_OPCODE 0x8e