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mig_strncpy: ensure destination string is null terminated 

Message-ID: <xaqw66fuawxm5hzgjscfg2oyp6lxflm5tnbb7u253pw3gmdy4m@5z42mw2qz2l2>
This commit is contained in:
Flavio Cruz 2025-02-09 22:37:56 -05:00 committed by Samuel Thibault
parent 6bcd7bf100
commit da49165ea6
1 changed files with 9 additions and 1 deletions
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10
mach/mig_strncpy.c
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@ -6,6 +6,14 @@
vm_size_t vm_size_t
__mig_strncpy (char *dst, const char *src, vm_size_t len) __mig_strncpy (char *dst, const char *src, vm_size_t len)
{ {
return __stpncpy (dst, src, len) - dst; if (len == 0)
return 0;
char *end = __stpncpy (dst, src, len - 1);
vm_size_t ret = end - dst;
/* Null terminate the string. */
if (ret == len - 1)
*end = '\0';
return ret;
} }
weak_alias (__mig_strncpy, mig_strncpy) weak_alias (__mig_strncpy, mig_strncpy)