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| author | Nadav Amit <[email protected]> | 2022-08-13 22:59:43 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2022-08-14 09:27:17 +0000 |
| commit | 8924779df820c53875abaeb10c648e9cb75b46d4 (patch) | |
| tree | 2018f44948641800482808fa1fd6724ef0e83de9 /drivers/acpi/cppc_acpi.c | |
| parent | x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments (diff) | |
| download | kernel-8924779df820c53875abaeb10c648e9cb75b46d4.tar.gz kernel-8924779df820c53875abaeb10c648e9cb75b46d4.zip | |
x86/kprobes: Fix JNG/JNLE emulation
When kprobes emulates JNG/JNLE instructions on x86 it uses the wrong
condition. For JNG (opcode: 0F 8E), according to Intel SDM, the jump is
performed if (ZF == 1 or SF != OF). However the kernel emulation
currently uses 'and' instead of 'or'.
As a result, setting a kprobe on JNG/JNLE might cause the kernel to
behave incorrectly whenever the kprobe is hit.
Fix by changing the 'and' to 'or'.
Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Signed-off-by: Nadav Amit <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
0 files changed, 0 insertions, 0 deletions