git: b5e557fda373 - stable/13 - O_PATH: Allow to open symlink

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=b5e557fda3739992ff722c4eaeb535da31aa7ab9

commit b5e557fda3739992ff722c4eaeb535da31aa7ab9
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-04-07 03:23:25 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-23 11:14:10 +0000

    O_PATH: Allow to open symlink
    
    (cherry picked from commit f9b923af34a6749c7703b957742f33cc02a485a2)
---
 sys/kern/vfs_vnops.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 6339295b0556..bb9ee2cceb79 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -385,8 +385,10 @@ vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred,
 	accmode_t accmode;
 	int error;
 
-	if (vp->v_type == VLNK)
-		return (EMLINK);
+	if (vp->v_type == VLNK) {
+		if ((fmode & O_PATH) == 0 || (fmode & FEXEC) != 0)
+			return (EMLINK);
+	}
 	if (vp->v_type == VSOCK)
 		return (EOPNOTSUPP);
 	if (vp->v_type != VDIR && fmode & O_DIRECTORY)