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Fix CVE-2011-4029: File permission change vulnerability.

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Use fchmod() to change permissions of the lock file instead
of chmod(), thus avoid the race that can be exploited to set
a symbolic link to any file or directory in the system.

Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
(cherry picked from commit b67581cf82)
This commit is contained in:
Matthieu Herrb 2011-10-17 22:27:35 +02:00 • committed by Julien Cristau
parent 1fec281b0d
commit e9ffc3a5f9
1 changed files with 1 additions and 1 deletions
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2
os/utils.c
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@ -306,7 +306,7 @@ LockServer(void)
FatalError("Could not create lock file in %s\n", tmp);
(void) sprintf(pid_str, "%10ld\n", (long)getpid());
(void) write(lfd, pid_str, 11);
(void) chmod(tmp, 0444);
(void) fchmod(lfd, 0444);
(void) close(lfd);
/*