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fs: support O_PATH fds with FSCONFIG_SET_FD

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Let FSCONFIG_SET_FD handle O_PATH file descriptors. This is particularly
useful in the context of overlayfs where layers can be specified via
file descriptors instead of paths. But userspace must currently use
non-O_PATH file desriptors which is often pointless especially if
the file descriptors have been created via open_tree(OPEN_TREE_CLONE).

Link: https://lore.kernel.org/r/20250210-work-overlayfs-v2-1-ed2a949b674b@kernel.org
Fixes: a08557d19e ("ovl: specify layers via file descriptors")
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-10 13:38:59 +01:00
parent 2cc0b7fd4b
commit 0ff053b98a
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GPG key ID: 91C61BC06578DCA2
2 changed files with 3 additions and 1 deletions
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2
fs/autofs/autofs_i.h
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@ -218,6 +218,8 @@ void autofs_clean_ino(struct autofs_info *);
static inline int autofs_check_pipe(struct file *pipe)
{
if (pipe->f_mode & FMODE_PATH)
return -EINVAL;
if (!(pipe->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
if (!S_ISFIFO(file_inode(pipe)->i_mode))

2
fs/fsopen.c
View file

@ -453,7 +453,7 @@ SYSCALL_DEFINE5(fsconfig,
case FSCONFIG_SET_FD:
param.type = fs_value_is_file;
ret = -EBADF;
param.file = fget(aux);
param.file = fget_raw(aux);
if (!param.file)
goto out_key;
param.dirfd = aux;