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The following patch was copied from Debian.
Description: Fix CVE-2015-3202
Missing scrubbing of the environment before executing a mount or umount
of a filesystem.
Origin: upstream
Author: Miklos Szeredi <miklos@szeredi.hu>
Last-Update: 2015-05-19
---
lib/mount_util.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
--- a/lib/mount_util.c
+++ b/lib/mount_util.c
@@ -95,10 +95,12 @@ static int add_mount(const char *prognam
goto out_restore;
}
if (res == 0) {
+ char *env = NULL;
+
sigprocmask(SIG_SETMASK, &oldmask, NULL);
setuid(geteuid());
- execl("/bin/mount", "/bin/mount", "--no-canonicalize", "-i",
- "-f", "-t", type, "-o", opts, fsname, mnt, NULL);
+ execle("/bin/mount", "/bin/mount", "--no-canonicalize", "-i",
+ "-f", "-t", type, "-o", opts, fsname, mnt, NULL, &env);
fprintf(stderr, "%s: failed to execute /bin/mount: %s\n",
progname, strerror(errno));
exit(1);
@@ -146,10 +148,17 @@ static int exec_umount(const char *progn
goto out_restore;
}
if (res == 0) {
+ char *env = NULL;
+
sigprocmask(SIG_SETMASK, &oldmask, NULL);
setuid(geteuid());
- execl("/bin/umount", "/bin/umount", "-i", rel_mnt,
- lazy ? "-l" : NULL, NULL);
+ if (lazy) {
+ execle("/bin/umount", "/bin/umount", "-i", rel_mnt,
+ "-l", NULL, &env);
+ } else {
+ execle("/bin/umount", "/bin/umount", "-i", rel_mnt,
+ NULL, &env);
+ }
fprintf(stderr, "%s: failed to execute /bin/umount: %s\n",
progname, strerror(errno));
exit(1);
@@ -205,10 +214,12 @@ static int remove_mount(const char *prog
goto out_restore;
}
if (res == 0) {
+ char *env = NULL;
+
sigprocmask(SIG_SETMASK, &oldmask, NULL);
setuid(geteuid());
- execl("/bin/umount", "/bin/umount", "--no-canonicalize", "-i",
- "--fake", mnt, NULL);
+ execle("/bin/umount", "/bin/umount", "--no-canonicalize", "-i",
+ "--fake", mnt, NULL, &env);
fprintf(stderr, "%s: failed to execute /bin/umount: %s\n",
progname, strerror(errno));
exit(1);
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