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fuse: handle idmappings properly in ->write_iter()

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This is needed to properly clear suid/sgid.

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 17:16:23 +02:00 committed by Miklos Szeredi
parent 4be75ffe72
commit 5b8ca5a54c
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/file.c
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@ -1398,6 +1398,7 @@ static void fuse_dio_unlock(struct kiocb *iocb, bool exclusive)
static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct mnt_idmap *idmap = file_mnt_idmap(file);
struct address_space *mapping = file->f_mapping;
ssize_t written = 0;
struct inode *inode = mapping->host;
@ -1412,7 +1413,7 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
return err;
if (fc->handle_killpriv_v2 &&
setattr_should_drop_suidgid(&nop_mnt_idmap,
setattr_should_drop_suidgid(idmap,
file_inode(file))) {
goto writethrough;
}