diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2023-01-12 20:43:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-01-13 11:48:17 +0100 |
| commit | 69d4c0d3218692ffa56b0e1b9c76c50c699d7044 (patch) | |
| tree | 632f322958ef60af5237ba029b2b82e5b4595c5d /mm/kasan/kasan.h | |
| parent | 365bd03ff63fb7433a49c453472cf54830b677bf (diff) | |
entry, kasan, x86: Disallow overriding mem*() functions
KASAN cannot just hijack the mem*() functions, it needs to emit
__asan_mem*() variants if it wants instrumentation (other sanitizers
already do this).
vmlinux.o: warning: objtool: sync_regs+0x24: call to memcpy() leaves .noinstr.text section
vmlinux.o: warning: objtool: vc_switch_off_ist+0xbe: call to memcpy() leaves .noinstr.text section
vmlinux.o: warning: objtool: fixup_bad_iret+0x36: call to memset() leaves .noinstr.text section
vmlinux.o: warning: objtool: __sev_get_ghcb+0xa0: call to memcpy() leaves .noinstr.text section
vmlinux.o: warning: objtool: __sev_put_ghcb+0x35: call to memcpy() leaves .noinstr.text section
Remove the weak aliases to ensure nobody hijacks these functions and
add them to the noinstr section.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195542.028523143@infradead.org
Diffstat (limited to 'mm/kasan/kasan.h')
| -rw-r--r-- | mm/kasan/kasan.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index ea8cf1310b1e..71c15438afcf 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -618,6 +618,10 @@ void __asan_set_shadow_f3(const void *addr, size_t size); void __asan_set_shadow_f5(const void *addr, size_t size); void __asan_set_shadow_f8(const void *addr, size_t size); +void *__asan_memset(void *addr, int c, size_t len); +void *__asan_memmove(void *dest, const void *src, size_t len); +void *__asan_memcpy(void *dest, const void *src, size_t len); + void __hwasan_load1_noabort(unsigned long addr); void __hwasan_store1_noabort(unsigned long addr); void __hwasan_load2_noabort(unsigned long addr); |