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LibC: Add explicit_bzero()

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This is a variant of bzero() that is guaranteed to not get optimized
away by the compiler. Useful for clearing out sensitive data.
This commit is contained in:
Andreas Kling 2021-01-09 20:04:18 +01:00
parent 4a83a37f79
commit 9a842ec419
2 changed files with 8 additions and 0 deletions
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7
Libraries/LibC/string.cpp
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@ -476,4 +476,11 @@ size_t strxfrm(char* dest, const char* src, size_t n)
dest[i] = '\0'; dest[i] = '\0';
return i; return i;
} }
void explicit_bzero(void* ptr, size_t size)
{
memset(ptr, 0, size);
asm volatile("" ::
: "memory");
}
} }

1
Libraries/LibC/string.h
View file

@ -44,6 +44,7 @@ void* memchr(const void*, int c, size_t);
const void* memmem(const void* haystack, size_t, const void* needle, size_t); const void* memmem(const void* haystack, size_t, const void* needle, size_t);
void* memset(void*, int, size_t); void* memset(void*, int, size_t);
void explicit_bzero(void*, size_t) __attribute__((nonnull(1)));
__attribute__((malloc)) char* strdup(const char*); __attribute__((malloc)) char* strdup(const char*);
__attribute__((malloc)) char* strndup(const char*, size_t); __attribute__((malloc)) char* strndup(const char*, size_t);