diff options
| author | Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2024-09-25 15:25:38 -0700 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2024-10-08 15:16:28 -0700 |
| commit | 2e2e5143d4868163d6756c8c6a4d28cbfa5245e5 (patch) | |
| tree | d95b4beb2e7f5662dad93cfa0a864f139ee052ed /ipc | |
| parent | d5fd042bf4cfb557981d65628e1779a492cd8cfa (diff) | |
x86/entry_32: Do not clobber user EFLAGS.ZF
Opportunistic SYSEXIT executes VERW to clear CPU buffers after user EFLAGS
are restored. This can clobber user EFLAGS.ZF.
Move CLEAR_CPU_BUFFERS before the user EFLAGS are restored. This ensures
that the user EFLAGS.ZF is not clobbered.
Closes: https://lore.kernel.org/lkml/yVXwe8gvgmPADpRB6lXlicS2fcHoV5OHHxyuFbB_MEleRPD7-KhGe5VtORejtPe-KCkT8Uhcg5d7-IBw4Ojb4H7z5LQxoZylSmJ8KNL3A8o=@protonmail.com/
Fixes: a0e2dab44d22 ("x86/entry_32: Add VERW just before userspace transition")
Reported-by: Jari Ruusu <jariruusu@protonmail.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240925-fix-dosemu-vm86-v7-1-1de0daca2d42%40linux.intel.com
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions