diff options
| author | Andy Lutomirski <luto@kernel.org> | 2015-03-19 01:33:28 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-23 09:08:21 (GMT) |
| commit | c56716af8d27ca8dd6e45445ae1c0a05fd9753a6 (patch) | |
| tree | 13f14e508342aa82efacf711d52d639dfc4d58ae | |
| parent | d31bf07f71a5568b48c5ed448e4299050469f615 (diff) | |
| download | linux-c56716af8d27ca8dd6e45445ae1c0a05fd9753a6.tar.xz | |
x86/asm/entry, perf: Fix incorrect TIF_IA32 check in code_segment_base()
We want to check whether user code is in 32-bit mode, not
whether the task is nominally 32-bit.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/33e5107085ce347a8303560302b15c2cadd62c4c.1426728647.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index b71a7f8..979963b 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -2161,10 +2161,9 @@ static unsigned long code_segment_base(struct pt_regs *regs) if (user_mode(regs) && regs->cs != __USER_CS) return get_segment_base(regs->cs); #else - if (test_thread_flag(TIF_IA32)) { - if (user_mode(regs) && regs->cs != __USER32_CS) - return get_segment_base(regs->cs); - } + if (user_mode(regs) && !user_64bit_mode(regs) && + regs->cs != __USER32_CS) + return get_segment_base(regs->cs); #endif return 0; } |