diff options
| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-09-26 10:52:32 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:32 +0200 |
| commit | a752d7194c4fb5a3e767c95542d04fc5decb1d52 (patch) | |
| tree | b63d56f85c10f5f26c67dc3e8cf4ac6366f4824b /arch/x86_64/kernel/ptrace.c | |
| parent | 8578bdf835d6d6ece6718858d351456367b8a5cf (diff) | |
[PATCH] fix is_at_popf() for compat tasks
When testing for the REX instruction prefix, first check
for 32-bit mode because in compat mode the REX prefix is an
increment instruction.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64/kernel/ptrace.c')
| -rw-r--r-- | arch/x86_64/kernel/ptrace.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c index d35ec1bc696..3a52c7bcfd1 100644 --- a/arch/x86_64/kernel/ptrace.c +++ b/arch/x86_64/kernel/ptrace.c @@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct *child, struct pt_regs *regs) case 0xf0: case 0xf2: case 0xf3: continue; - /* REX prefixes */ case 0x40 ... 0x4f: + if (regs->cs != __USER_CS) + /* 32-bit mode: register increment */ + return 0; + /* 64-bit mode: REX prefix */ continue; /* CHECKME: f0, f2, f3 */ |