diff options
| author |   Andy Lutomirski <luto@amacapital.net> | 2015-02-24 16:01:38 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-02-25 08:27:49 +0100 |
| commit | 08571f1ae327bfb631cb7171bde5ea605df626c6 (patch) | |
| tree | b480579dd9f05b86b6b004893d1e234acd534af5 /arch | |
| parent | x86/asm: Add support for the pcommit instruction (diff) | |
| download | linux-dev-08571f1ae327bfb631cb7171bde5ea605df626c6.tar.xz linux-dev-08571f1ae327bfb631cb7171bde5ea605df626c6.zip | |
x86/ptrace: Remove checks for TIF_IA32 when changing CS and SS
The ability for modified CS and/or SS to be useful has nothing
to do with TIF_IA32. Similarly, if there's an exploit involving
changing CS or SS, it's exploitable with or without a TIF_IA32
check.
So just delete the check.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Link: http://lkml.kernel.org/r/71c7ab36456855d11ae07edd4945a7dfe80f9915.1424822291.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/ptrace.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c index e510618b2e91..1e125817cf9f 100644 --- a/arch/x86/kernel/ptrace.c +++ b/arch/x86/kernel/ptrace.c @@ -364,18 +364,12 @@ static int set_segment_reg(struct task_struct *task, case offsetof(struct user_regs_struct,cs): if (unlikely(value == 0)) return -EIO; -#ifdef CONFIG_IA32_EMULATION - if (test_tsk_thread_flag(task, TIF_IA32)) - task_pt_regs(task)->cs = value; -#endif + task_pt_regs(task)->cs = value; break; case offsetof(struct user_regs_struct,ss): if (unlikely(value == 0)) return -EIO; -#ifdef CONFIG_IA32_EMULATION - if (test_tsk_thread_flag(task, TIF_IA32)) - task_pt_regs(task)->ss = value; -#endif + task_pt_regs(task)->ss = value; break; } |