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x86/tdx: Replace deprecated strncpy() with strtomem_pad()

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strncpy() works perfectly here in all cases, however, it is deprecated and
as such we should prefer more robust and less ambiguous string APIs:

    https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings

Let's use strtomem_pad() as this matches the functionality of strncpy()
and is _not_ deprecated.

Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://github.com/KSPP/linux/issues/90
Link: https://lore.kernel.org/r/20231003-strncpy-arch-x86-coco-tdx-tdx-c-v2-1-0bd21174a217@google.com
This commit is contained in:
Justin Stitt 2023-10-03 21:54:59 +00:00 • committed by Ingo Molnar
parent 802e87cc46
commit c9babd5d95
1 changed files with 1 additions and 1 deletions
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2
arch/x86/coco/tdx/tdx.c
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@ -119,7 +119,7 @@ static void __noreturn tdx_panic(const char *msg)
} message;
/* VMM assumes '\0' in byte 65, if the message took all 64 bytes */
strncpy(message.str, msg, 64);
strtomem_pad(message.str, msg, '\0');
args.r8 = message.r8;
args.r9 = message.r9;