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authorEtienne Basset <etienne.basset@numericable.fr>2009-04-16 23:58:42 +0200
committerJames Morris <jmorris@namei.org>2009-04-18 12:58:25 +1000
commitdefc433ba3bc587826bb467ce0e63452deafa65d (patch)
treefb11744178f227598b1b26e1c6f24041261c3b98 /security
parentaefe6475720bd5eb8aacbc881488f3aa65618562 (diff)
downloadlinux-defc433ba3bc587826bb467ce0e63452deafa65d.tar.gz
Smack: check for SMACK xattr validity in smack_inode_setxattr
the following patch moves checks for SMACK xattr validity from smack_inode_post_setxattr (which cannot return an error to the user) to smack_inode_setxattr (which can return an error). Signed-off-by: Etienne Basset <etienne.basset@numericable.fr> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/smack/smack_lsm.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 921514902ec..98b3195347a 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -609,8 +609,12 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
- /* a label cannot be void and cannot begin with '-' */
- if (size == 0 || (size > 0 && ((char *)value)[0] == '-'))
+ /*
+ * check label validity here so import wont fail on
+ * post_setxattr
+ */
+ if (size == 0 || size >= SMK_LABELLEN ||
+ smk_import(value, size) == NULL)
rc = -EINVAL;
} else
rc = cap_inode_setxattr(dentry, name, value, size, flags);
@@ -644,9 +648,6 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
if (strcmp(name, XATTR_NAME_SMACK))
return;
- if (size >= SMK_LABELLEN)
- return;
-
isp = dentry->d_inode->i_security;
/*