Messages in this thread Patch in this message | | | Date | Wed, 29 Apr 2009 15:07:17 -0700 | From | Greg KH <> | Subject | [patch 18/58] security/smack: fix oops when setting a size 0 SMACK64 xattr |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Etienne Basset <etienne.basset@numericable.fr>
upstream commit: 4303154e86597885bc3cbc178a48ccbc8213875f
this patch fix an oops in smack when setting a size 0 SMACK64 xattr eg attr -S -s SMACK64 -V '' somefile This oops because smk_import_entry treats a 0 length as SMK_MAXLEN
Signed-off-by: Etienne Basset <etienne.basset@numericable.fr> Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- security/smack/smack_lsm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -604,6 +604,8 @@ static int smack_inode_setxattr(struct d strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { if (!capable(CAP_MAC_ADMIN)) rc = -EPERM; + if (size == 0) + rc = -EINVAL; } else rc = cap_inode_setxattr(dentry, name, value, size, flags); @@ -1360,7 +1362,7 @@ static int smack_inode_setsecurity(struc struct socket *sock; int rc = 0; - if (value == NULL || size > SMK_LABELLEN) + if (value == NULL || size > SMK_LABELLEN || size == 0) return -EACCES; sp = smk_import(value, size);
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