diff options
| author | Andy Lutomirski <[email protected]> | 2019-11-20 10:10:49 +0100 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2019-11-21 19:37:44 +0100 |
| commit | a1a338e5b6fe9e0a39c57c232dc96c198bb53e47 (patch) | |
| tree | 1895708bea9167003a38d7eb4a4431b4dc5edb00 /scripts/gcc-plugins/cyc_complexity_plugin.c | |
| parent | 82cb8a0b1d8d07817b5d59f7fa1438e1fceafab2 (diff) | |
x86/entry/32: Unwind the ESPFIX stack earlier on exception entry
Right now, we do some fancy parts of the exception entry path while SS
might have a nonzero base: we fill in regs->ss and regs->sp, and we
consider switching to the kernel stack. This results in regs->ss and
regs->sp referring to a non-flat stack and it may result in
overflowing the entry stack. The former issue means that we can try to
call iret_exc on a non-flat stack, which doesn't work.
Tested with selftests/x86/sigreturn_32.
Fixes: 45d7b255747c ("x86/entry/32: Enter the kernel via trampoline stack")
Signed-off-by: Andy Lutomirski <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Diffstat (limited to 'scripts/gcc-plugins/cyc_complexity_plugin.c')
0 files changed, 0 insertions, 0 deletions