From c56716af8d27ca8dd6e45445ae1c0a05fd9753a6 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Wed, 18 Mar 2015 18:33:28 -0700 Subject: [PATCH] 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 Cc: Borislav Petkov Cc: Brad Spengler Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/33e5107085ce347a8303560302b15c2cadd62c4c.1426728647.git.luto@kernel.org Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index b71a7f86d68a..979963bb3977 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; } -- 2.20.1