6.13-stable review patch. If anyone has any objections, please let me know.
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From: Christian Brauner brauner@kernel.org
[ Upstream commit 0ff053b98a0f039e52c2bd8d0cb38f2831edfaf5 ]
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.o... Fixes: a08557d19ef41 ("ovl: specify layers via file descriptors") Reviewed-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/autofs/autofs_i.h | 2 ++ fs/fsopen.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h index 77c7991d89aac..23cea74f9933b 100644 --- a/fs/autofs/autofs_i.h +++ b/fs/autofs/autofs_i.h @@ -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)) diff --git a/fs/fsopen.c b/fs/fsopen.c index 094a7f510edfe..1aaf4cb2afb29 100644 --- a/fs/fsopen.c +++ b/fs/fsopen.c @@ -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;