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From c6b962ba0e84d84cb8434aae62108b537de04c2c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Bollo?= <jose.bollo@open.eurogiciel.org>
Date: Thu, 3 Apr 2014 13:48:41 +0200
Subject: [PATCH 28/54] SMACK: Fix handling value==NULL in post setxattr
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The function `smack_inode_post_setxattr` is called each
time that a setxattr is done, for any value of name.
The kernel allow to put value==NULL when size==0
to set an empty attribute value. The systematic
call to smk_import_entry was causing the dereference
of a NULL pointer hence a KERNEL PANIC!
The problem can be produced easily by issuing the
command `setfattr -n user.data file` under bash prompt
when SMACK is active.
Moving the call to smk_import_entry as proposed by this
patch is correcting the behaviour because the function
smack_inode_post_setxattr is called for the SMACK's
attributes only if the function smack_inode_setxattr validated
the value and its size (what will not be the case when size==0).
It also has a benefical effect to not fill the smack hash
with garbage values coming from any extended attribute
write.
Change-Id: Iaf0039c2be9bccb6cee11c24a3b44d209101fe47
Signed-off-by: José Bollo <jose.bollo@open.eurogiciel.org>
---
security/smack/smack_lsm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index b47fd5f..e6c0a57 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -960,18 +960,20 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
return;
}
- skp = smk_import_entry(value, size);
if (strcmp(name, XATTR_NAME_SMACK) == 0) {
+ skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_inode = skp->smk_known;
else
isp->smk_inode = smack_known_invalid.smk_known;
} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
+ skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_task = skp;
else
isp->smk_task = &smack_known_invalid;
} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
+ skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_mmap = skp;
else
--
2.1.4
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