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| author |  Borislav Petkov (AMD) <bp@alien8.de>
| 2023-05-15 16:07:26 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de>
| 2023-05-17 12:14:21 +0200 |
| commit | f220125b999b2c9694149c6bda2798d8096f47ed (patch) | |
| tree | 7cee09cfdcadf0a27866192d98be136f3a388130 /arch/x86/kernel/vmlinux.lds.S | |
| parent | x86/cpu: Remove X86_FEATURE_NAMES (diff) | |
| download | linux-f220125b999b2c9694149c6bda2798d8096f47ed.tar.gz linux-f220125b999b2c9694149c6bda2798d8096f47ed.tar.bz2 linux-f220125b999b2c9694149c6bda2798d8096f47ed.zip | |
x86/retbleed: Add __x86_return_thunk alignment checks
Add a linker assertion and compute the 0xcc padding dynamically so that
__x86_return_thunk is always cacheline-aligned. Leave the SYM_START()
macro in as the untraining doesn't need ENDBR annotations anyway.
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lore.kernel.org/r/20230515140726.28689-1-bp@alien8.de
Diffstat (limited to 'arch/x86/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 25f155205770..03c885d3640f 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -508,4 +508,8 @@ INIT_PER_CPU(irq_stack_backing_store); "fixed_percpu_data is not at start of per-cpu area"); #endif +#ifdef CONFIG_RETHUNK +. = ASSERT((__x86_return_thunk & 0x3f) == 0, "__x86_return_thunk not cacheline-aligned"); +#endif + #endif /* CONFIG_X86_64 */ |