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| author | Andy Lutomirski <luto@amacapital.net> | 2015-02-27 01:40:39 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-05 00:50:53 +0300 |
| commit | 1e3fbb8a1d814f35e2e689cf87714d38d9f3564d (patch) | |
| tree | a16fcdfd5d18f59b9ddec985e78c45101444ad96 /arch/x86/include/asm/desc.h | |
| parent | d441c1f2b73ec742c2e55be804ebc6fee130c77f (diff) | |
| download | linux-1e3fbb8a1d814f35e2e689cf87714d38d9f3564d.tar.xz | |
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>
Link: http://lkml.kernel.org/r/4710be56d76ef994ddf59087aad98c000fbab9a4.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/desc.h')
0 files changed, 0 insertions, 0 deletions