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| author | Pawan Gupta <[email protected]> | 2025-05-05 21:35:12 +0000 |
|---|---|---|
| committer | Dave Hansen <[email protected]> | 2025-05-06 15:18:59 +0000 |
| commit | 073fdbe02c69c43fb7c0d547ec265c7747d4a646 (patch) | |
| tree | 453bb3e1a7c95014cea041fd2f1779594171db80 /net/unix/af_unix.c | |
| parent | x86/bpf: Add IBHF call at end of classic BPF (diff) | |
| download | kernel-073fdbe02c69c43fb7c0d547ec265c7747d4a646.tar.gz kernel-073fdbe02c69c43fb7c0d547ec265c7747d4a646.zip | |
x86/bhi: Do not set BHI_DIS_S in 32-bit mode
With the possibility of intra-mode BHI via cBPF, complete mitigation for
BHI is to use IBHF (history fence) instruction with BHI_DIS_S set. Since
this new instruction is only available in 64-bit mode, setting BHI_DIS_S in
32-bit mode is only a partial mitigation.
Do not set BHI_DIS_S in 32-bit mode so as to avoid reporting misleading
mitigated status. With this change IBHF won't be used in 32-bit mode, also
remove the CONFIG_X86_64 check from emit_spectre_bhb_barrier().
Suggested-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Pawan Gupta <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Alexandre Chartre <[email protected]>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions