From 10975933da3d65f8833d4ce98dcc2ecc63a695d6 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Thu, 20 Nov 2014 16:08:59 +0100 Subject: [PATCH] init: fix read-write root mount If mount flags don't have MS_RDONLY, iso9660 returns EACCES without actually checking if it's an iso image. This tricks mount_block_root() into retrying with MS_RDONLY. This results in a read-only root despite the "rw" boot parameter if the actual filesystem was checked after iso9660. I believe the behavior of iso9660 is okay, while that of mount_block_root() is not. It should rather try all types without MS_RDONLY and only then retry with MS_RDONLY. This change also makes the code more robust against the case when EACCES is returned despite MS_RDONLY, which would've resulted in a lockup. Signed-off-by: Miklos Szeredi Signed-off-by: Al Viro --- init/do_mounts.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/init/do_mounts.c b/init/do_mounts.c index 9b3565c41502..eb410083e8e0 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -395,8 +395,6 @@ retry: case 0: goto out; case -EACCES: - flags |= MS_RDONLY; - goto retry; case -EINVAL: continue; } @@ -419,6 +417,10 @@ retry: #endif panic("VFS: Unable to mount root fs on %s", b); } + if (!(flags & MS_RDONLY)) { + flags |= MS_RDONLY; + goto retry; + } printk("List of all partitions:\n"); printk_all_partitions(); -- 2.30.2