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From: Ludwig Nussel <ludwig.nussel@suse.de>
Date: Thu, 20 Sep 2007 12:57:20 +0000 (+0200)
Subject: mount: doesn't drop privileges properly when calling helpers
X-Git-Url: http://git.kernel.org/?p=utils%2Futil-linux-ng%2Futil-linux-ng.git;a=commitdiff_plain;h=ebbeb2c7ac1b00b6083905957837a271e80b187e
mount: doesn't drop privileges properly when calling helpers
{,u}mount calls setuid() and setgid() in the wrong order and doesn't checking
the return value of set{u,g}id(() when running helpers like mount.nfs.
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Signed-off-by: Karel Zak <kzak@redhat.com>
---
diff --git a/mount/mount.c b/mount/mount.c
index 40699f3..5bc2b30 100644
--- a/mount/mount.c
+++ b/mount/mount.c
@@ -634,8 +634,12 @@ check_special_mountprog(const char *spec, const char *node, const char *type, in
char *oo, *mountargs[10];
int i = 0;
- setuid(getuid());
- setgid(getgid());
+ if(setgid(getgid()) < 0)
+ die(EX_FAIL, _("mount: cannot set group id: %s"), strerror(errno));
+
+ if(setuid(getuid()) < 0)
+ die(EX_FAIL, _("mount: cannot set user id: %s"), strerror(errno));
+
oo = fix_opts_string (flags, extra_opts, NULL);
mountargs[i++] = mountprog; /* 1 */
mountargs[i++] = (char *) spec; /* 2 */
diff --git a/mount/umount.c b/mount/umount.c
index b3100c9..3221619 100644
--- a/mount/umount.c
+++ b/mount/umount.c
@@ -102,8 +102,12 @@ check_special_umountprog(const char *spec, const char *node,
char *umountargs[8];
int i = 0;
- setuid(getuid());
- setgid(getgid());
+ if(setgid(getgid()) < 0)
+ die(EX_FAIL, _("umount: cannot set group id: %s"), strerror(errno));
+
+ if(setuid(getuid()) < 0)
+ die(EX_FAIL, _("umount: cannot set user id: %s"), strerror(errno));
+
umountargs[i++] = umountprog;
umountargs[i++] = xstrdup(node);
if (nomtab)
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