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guard against hard links to non-ordinary-files when reading tcb shadow

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This commit is contained in:
Rich Felker 2011-02-14 21:15:07 -05:00
parent ca1aa5bae9
commit 976f42d1f1
1 changed files with 4 additions and 2 deletions
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6
src/passwd/getspnam_r.c
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@ -1,5 +1,6 @@
#include <fcntl.h> #include <fcntl.h>
#include <unistd.h> #include <unistd.h>
#include <sys/stat.h>
#include "pwf.h" #include "pwf.h"
/* This implementation support Openwall-style TCB passwords in place of /* This implementation support Openwall-style TCB passwords in place of
@ -34,8 +35,9 @@ int getspnam_r(const char *name, struct spwd *sp, char *buf, size_t size, struct
fd = open(path, O_RDONLY|O_NOFOLLOW|O_NONBLOCK); fd = open(path, O_RDONLY|O_NOFOLLOW|O_NONBLOCK);
if (fd >= 0) { if (fd >= 0) {
f = fdopen(fd, "rb"); struct stat st = { 0 };
if (!f) { errno = EINVAL;
if (fstat(fd, &st) || !S_ISREG(st.st_mode) || !(f = fdopen(fd, "rb"))) {
close(fd); close(fd);
return errno; return errno;
} }