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authorRichard Guy Briggs <rgb@redhat.com>2019-01-23 13:35:00 -0500
committerPaul Moore <paul@paul-moore.com>2019-01-30 20:51:47 -0500
commit57d4657716aca81ef4d7ec23e8123d26e3d28954 (patch)
tree61af3d955d7a01767f7d1e6ede67ca6096cc8a07 /kernel/audit.c
parent05c7a9cb2727cd3c3d8e767f48e5cd18486a8d16 (diff)
audit: ignore fcaps on umount
Don't fetch fcaps when umount2 is called to avoid a process hang while it waits for the missing resource to (possibly never) re-appear. Note the comment above user_path_mountpoint_at(): * A umount is a special case for path walking. We're not actually interested * in the inode in this situation, and ESTALE errors can be a problem. We * simply want track down the dentry and vfsmount attached at the mountpoint * and avoid revalidating the last component. This can happen on ceph, cifs, 9p, lustre, fuse (gluster) or NFS. Please see the github issue tracker https://github.com/linux-audit/audit-kernel/issues/100 Signed-off-by: Richard Guy Briggs <rgb@redhat.com> [PM: merge fuzz in audit_log_fcaps()] Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 3f3f1888cac7..b7177a8def2e 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2082,6 +2082,10 @@ void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
{
+ if (name->fcap_ver == -1) {
+ audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?");
+ return;
+ }
audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d",
@@ -2114,7 +2118,7 @@ static inline int audit_copy_fcaps(struct audit_names *name,
/* Copy inode data into an audit_names. */
void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
- struct inode *inode)
+ struct inode *inode, unsigned int flags)
{
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
@@ -2123,6 +2127,10 @@ void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
security_inode_getsecid(inode, &name->osid);
+ if (flags & AUDIT_INODE_NOEVAL) {
+ name->fcap_ver = -1;
+ return;
+ }
audit_copy_fcaps(name, dentry);
}

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