The branch main has been updated by kib:
URL:
https://cgit.FreeBSD.org/src/commit/?id=2082565798041ceb9fb77137f00ea6b0ff50fe5e
commit 2082565798041ceb9fb77137f00ea6b0ff50fe5e
Author: Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2021-04-28 15:45:36 +0000
Commit: Konstantin Belousov <k...@freebsd.org>
CommitDate: 2021-04-30 14:43:45 +0000
O_PATH: disable kqfilter for fifos
Filter on fifos is real filter for the object, and not a filesystem
events filter like EVFILT_VNODE.
Reported by: markj using syzkaller
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
---
sys/kern/vfs_vnops.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index f715c9828d04..832c717a33b7 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -427,7 +427,10 @@ vn_open_vnode(struct vnode *vp, int fmode, struct ucred
*cred,
return (error);
}
if ((fmode & O_PATH) != 0) {
- error = VOP_ACCESS(vp, VREAD, cred, td);
+ if (vp->v_type == VFIFO)
+ error = EPIPE;
+ else
+ error = VOP_ACCESS(vp, VREAD, cred, td);
if (error == 0)
fp->f_flag |= FKQALLOWED;
return (0);
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