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fuse: warn if fuse_access is called when idmapped mounts are allowed

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It is not possible with the current fuse code, but let's protect ourselves
from regressions in the future.

Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Alexander Mikhalitsyn 2024-09-03 17:16:24 +02:00 committed by Miklos Szeredi
parent 5b8ca5a54c
commit 6d14b18596
1 changed files with 8 additions and 0 deletions
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8
fs/fuse/dir.c
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@ -1474,6 +1474,14 @@ static int fuse_access(struct inode *inode, int mask)
BUG_ON(mask & MAY_NOT_BLOCK);
/*
* We should not send FUSE_ACCESS to the userspace
* when idmapped mounts are enabled as for this case
* we have fc->default_permissions = 1 and access
* permission checks are done on the kernel side.
*/
WARN_ON_ONCE(!(fm->sb->s_iflags & SB_I_NOIDMAP));
if (fm->fc->no_access)
return 0;