diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2019-11-20 15:02:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-29 10:09:58 +0100 |
| commit | e74c494a20df1fbd096d3fa60e39bc3f06863bd6 (patch) | |
| tree | 26af2149053870bce870c8965b18957d952cf79a /tools | |
| parent | 778226c41e6a146f13bd6bd09390a9dd3f946f32 (diff) | |
x86/entry/32: Fix NMI vs ESPFIX
commit 895429076512e9d1cf5428181076299c90713159 upstream.
When the NMI lands on an ESPFIX_SS, we are on the entry stack and must
swizzle, otherwise we'll run do_nmi() on the entry stack, which is
BAD.
Also, similar to the normal exception path, we need to correct the
ESPFIX magic before leaving the entry stack, otherwise pt_regs will
present a non-flat stack pointer.
Tested by running sigreturn_32 concurrent with perf-record.
Fixes: e5862d0515ad ("x86/entry/32: Leave the kernel via trampoline stack")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions