The patch titled
x86_64: fix is_at_popf() for compat tasks
has been added to the -mm tree. Its filename is
x86_64-fix-is_at_popf-for-compat-tasks.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86_64: fix is_at_popf() for compat tasks
From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
When testing for the REX instruction prefix, first check for a 32-bit task
because in compat mode the REX prefix is an increment instruction.
Signed-off-by: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/kernel/ptrace.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/ptrace.c~x86_64-fix-is_at_popf-for-compat-tasks arch/x86_64/kernel/ptrace.c
--- a/arch/x86_64/kernel/ptrace.c~x86_64-fix-is_at_popf-for-compat-tasks
+++ a/arch/x86_64/kernel/ptrace.c
@@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct
case 0xf0: case 0xf2: case 0xf3:
continue;
- /* REX prefixes */
case 0x40 ... 0x4f:
+ if (is_compat_task())
+ /* register increment */
+ return 0;
+ /* REX prefix */
continue;
/* CHECKME: f0, f2, f3 */
_
Patches currently in -mm which might be from 76306.1226@xxxxxxxxxxxxxx are
x86_64-fix-is_at_popf-for-compat-tasks.patch
i386-print-stack-size-in-oops-messages.patch
sleazy-fpu-feature-i386-support.patch
i386-early-fault-handler.patch
i386-fix-recursive-faults-during-oops-when-current.patch
i386-show_registers-try-harder-to-print-failing.patch
spinlock_debug-dont-recompute-jiffies_per_loop.patch
-
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