diff options
| author | Peter Collingbourne <pcc@google.com> | 2020-11-21 01:59:02 -0800 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-11-25 16:53:19 +0000 |
| commit | 49b3cf035edc5d7deb3ad1bf6805ce456ababc5b (patch) | |
| tree | 274247e95ef4c456f3ef4e8530929054138bfb1c /arch/arm64/kernel/vmlinux.lds.S | |
| parent | 739003c6428387432d42b9b80be185cde93978aa (diff) | |
kasan: arm64: set TCR_EL1.TBID1 when enabled
On hardware supporting pointer authentication, we previously ended up
enabling TBI on instruction accesses when tag-based ASAN was enabled,
but this was costing us 8 bits of PAC entropy, which was unnecessary
since tag-based ASAN does not require TBI on instruction accesses. Get
them back by setting TCR_EL1.TBID1.
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://linux-review.googlesource.com/id/I3dded7824be2e70ea64df0aabab9598d5aebfcc4
Link: https://lore.kernel.org/r/20f64e26fc8a1309caa446fffcb1b4e2fe9e229f.1605952129.git.pcc@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/vmlinux.lds.S')
0 files changed, 0 insertions, 0 deletions