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x86: Remove arch-specific strncpy() implementation

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strncpy() has no remaining callers in the kernel[1]. Remove the
x86-32-specific inline assembly implementation and __HAVE_ARCH_STRNCPY
define, falling back to the generic version in lib/string.c.

Link: https://github.com/KSPP/linux/issues/90 [1]
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2026-03-23 01:17:59 +00:00
parent 7eda356658
commit dfe05fcca8
2 changed files with 0 additions and 22 deletions
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arch/x86/include/asm/string_32.h
-3
View File
@@ -9,9 +9,6 @@
#define __HAVE_ARCH_STRCPY
extern char *strcpy(char *dest, const char *src);
#define __HAVE_ARCH_STRNCPY
extern char *strncpy(char *dest, const char *src, size_t count);
#define __HAVE_ARCH_STRCAT
extern char *strcat(char *dest, const char *src);
arch/x86/lib/string_32.c
-19
View File
@@ -30,25 +30,6 @@ char *strcpy(char *dest, const char *src)
EXPORT_SYMBOL(strcpy);
#endif
#ifdef __HAVE_ARCH_STRNCPY
char *strncpy(char *dest, const char *src, size_t count)
{
int d0, d1, d2, d3;
asm volatile("1:\tdecl %2\n\t"
"js 2f\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"rep stosb\n"
"2:"
: "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)
: "0" (src), "1" (dest), "2" (count) : "memory");
return dest;
}
EXPORT_SYMBOL(strncpy);
#endif
#ifdef __HAVE_ARCH_STRCAT
char *strcat(char *dest, const char *src)
{