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| 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 /tools/objtool | |
| 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 'tools/objtool')
| -rw-r--r-- | tools/objtool/check.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 9767babfd9ed..92554c5c80aa 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1074,6 +1074,9 @@ static const char *uaccess_safe_builtin[] = { "__asan_store16_noabort", "__kasan_check_read", "__kasan_check_write", + "__asan_memset", + "__asan_memmove", + "__asan_memcpy", /* KASAN in-line */ "__asan_report_load_n_noabort", "__asan_report_load1_noabort", |