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dump_common_audit_data(): fix racy accesses to ->d_name 

commit d36a1dd9f7 upstream.

We are not guaranteed the locking environment that would prevent
dentry getting renamed right under us.  And it's possible for
old long name to be freed after rename, leading to UAF here.

Cc: stable@kernel.org # v2.6.2+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2021-01-05 14:43:46 -05:00 committed by Greg Kroah-Hartman
parent de581e4171
commit fda4bb55c4
1 changed files with 5 additions and 2 deletions
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7
security/lsm_audit.c
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@ -277,7 +277,9 @@ static void dump_common_audit_data(struct audit_buffer *ab,
struct inode *inode;
audit_log_format(ab, " name=");
spin_lock(&a->u.dentry->d_lock);
audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
spin_unlock(&a->u.dentry->d_lock);
inode = d_backing_inode(a->u.dentry);
if (inode) {
@ -295,8 +297,9 @@ static void dump_common_audit_data(struct audit_buffer *ab,
dentry = d_find_alias(inode);
if (dentry) {
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab,
dentry->d_name.name);
spin_lock(&dentry->d_lock);
audit_log_untrustedstring(ab, dentry->d_name.name);
spin_unlock(&dentry->d_lock);
dput(dentry);
}
audit_log_format(ab, " dev=");