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audit: ignore fcaps on umount

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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>
This commit is contained in:
Richard Guy Briggs
2019-01-23 13:35:00 -05:00
committed by Paul Moore
parent 05c7a9cb27
commit 57d4657716
7 changed files with 29 additions and 11 deletions
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2
kernel/audit.h
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@@ -215,7 +215,7 @@ extern void audit_log_session_info(struct audit_buffer *ab);
extern void audit_copy_inode(struct audit_names *name,
const struct dentry *dentry,
struct inode *inode);
struct inode *inode, unsigned int flags);
extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
kernel_cap_t *cap);
extern void audit_log_name(struct audit_context *context,