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Mimic gzip chown(gid), chmod(), chown(uid) Behavior

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Avoids a race condition in which we unintentionally open up permissions to
the wrong group.
This commit is contained in:
W. Felix Handte
2023-01-17 16:37:30 -08:00
parent 1e3eba65a6
commit 0d2d460223
5 changed files with 18 additions and 4 deletions
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16
programs/util.c
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@ -249,11 +249,23 @@ int UTIL_setFileStat(const char *filename, const stat_t *statbuf)
/* set access and modification times */
res += UTIL_utime(filename, statbuf);
/* Mimic gzip's behavior:
*
* "Change the group first, then the permissions, then the owner.
* That way, the permissions will be correct on systems that allow
* users to give away files, without introducing a security hole.
* Security depends on permissions not containing the setuid or
* setgid bits." */
#if !defined(_WIN32)
res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
res += chown(filename, -1, statbuf->st_gid); /* Apply group ownership */
#endif
res += UTIL_chmod(filename, &curStatBuf, statbuf->st_mode & 07777); /* Copy file permissions */
res += UTIL_chmod(filename, &curStatBuf, statbuf->st_mode & 0777); /* Copy file permissions */
#if !defined(_WIN32)
res += chown(filename, statbuf->st_uid, -1); /* Apply user ownership */
#endif
errno = 0;
UTIL_TRACE_RET(-res);