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| author |   Andy Lutomirski <luto@kernel.org> | 2019-11-24 08:50:03 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-11-25 09:36:47 +0100 |
| commit | 4a13b0e3e10996b9aa0b45a764ecfe49f6fcd360 (patch) | |
| tree | b7f1190c4712e52a4eeb867c98286f15da644845 /tools/testing/selftests | |
| parent | x86/pti/32: Calculate the various PTI cpu_entry_area sizes correctly, make the CPU_ENTRY_AREA_PAGES assert precise (diff) | |
| download | linux-dev-4a13b0e3e10996b9aa0b45a764ecfe49f6fcd360.tar.xz linux-dev-4a13b0e3e10996b9aa0b45a764ecfe49f6fcd360.zip | |
x86/entry/32: Fix FIXUP_ESPFIX_STACK with user CR3
UNWIND_ESPFIX_STACK needs to read the GDT, and the GDT mapping that
can be accessed via %fs is not mapped in the user pagetables. Use
SGDT to find the cpu_entry_area mapping and read the espfix offset
from that instead.
Reported-and-tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/testing/selftests')
0 files changed, 0 insertions, 0 deletions