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author | Roland McGrath <roland@redhat.com> | 2008-06-23 20:41:12 -0700 |
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committer | Roland McGrath <roland@redhat.com> | 2008-07-23 17:43:36 -0700 |
commit | 15e8f348db372dec21229fda5d52ae6ee7e64666 (patch) | |
tree | 73afc044ef5b4e29a893e98afee2fe794938aeb3 /kernel/auditsc.c | |
parent | 20b7997e8abdf338dcc27fb4f1333c4973a7f113 (diff) | |
download | linux-15e8f348db372dec21229fda5d52ae6ee7e64666.tar.bz2 |
x86_64: remove bogus optimization in sysret_signal
This short-circuit path in sysret_signal looks wrong to me.
AFAICT, in practice the branch is never taken--and if it were,
it would go wrong. To wit, try loading a module whose init
function does set_thread_flag(TIF_IRET), and see insmod crash
(presumably with a wrong user stack pointer).
This is because the FIXUP_TOP_OF_STACK work hasn't been done yet
when we jump around the call to ptregscall_common and get to
int_with_check--where it expects the user RSP,SS,CS and EFLAGS to
have been stored by FIXUP_TOP_OF_STACK.
I don't think it's normally possible to get to sysret_signal with no
_TIF_DO_NOTIFY_MASK bits set anyway, so these two instructions are
already superfluous. If it ever did happen, it is harmless to call
do_notify_resume with nothing for it to do.
Signed-off-by: Roland McGrath <roland@redhat.com>
Diffstat (limited to 'kernel/auditsc.c')
0 files changed, 0 insertions, 0 deletions