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| author |   Andy Lutomirski <luto@amacapital.net> | 2015-03-05 01:09:44 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-03-05 01:12:23 +0100 |
| commit | 956421fbb74c3a6261903f3836c0740187cf038b (patch) | |
| tree | 967092d812aed42305767c875bd7681bda57ca7e /arch/x86/Kconfig | |
| parent | Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent (diff) | |
| download | linux-dev-956421fbb74c3a6261903f3836c0740187cf038b.tar.xz linux-dev-956421fbb74c3a6261903f3836c0740187cf038b.zip | |
x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization
'ret_from_fork' checks TIF_IA32 to determine whether 'pt_regs' and
the related state make sense for 'ret_from_sys_call'. This is
entirely the wrong check. TS_COMPAT would make a little more
sense, but there's really no point in keeping this optimization
at all.
This fixes a return to the wrong user CS if we came from int
0x80 in a 64-bit task.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/4710be56d76ef994ddf59087aad98c000fbab9a4.1424989793.git.luto@amacapital.net
[ Backported from tip:x86/asm. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions