[PATCH 5.4 159/215] fs: add a vfs_fchmod helper

Greg Kroah-Hartman
2024-04-11T10:21:46Z

From: Christoph Hellwig <hch@lst.de>

[ Upstream commit 9e96c8c0e94eea2f69a9705f5d0f51928ea26c17 ]

Add a helper for struct file based chmode operations. To be used by
the initramfs code soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Stable-dep-of: 4624b346cf67 ("init: open /initrd.image with O_LARGEFILE")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/open.c | 9 +++++++--
include/linux/fs.h | 1 +
2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index 9213c15d8a8d6..484b300f3e026 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -570,14 +570,19 @@ static int chmod_common(const struct path *path, umode_t mode)
return error;
}

+int vfs_fchmod(struct file *file, umode_t mode)
+{
+ audit_file(file);
+ return chmod_common(&file->f_path, mode);
+}
+
int ksys_fchmod(unsigned int fd, umode_t mode)
{
struct fd f = fdget(fd);
int err = -EBADF;

if (f.file) {
- audit_file(f.file);
- err = chmod_common(&f.file->f_path, mode);
+ err = vfs_fchmod(f.file, mode);
fdput(f);
}
return err;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 03de5c7134564..5e122cb506d6e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1731,6 +1731,7 @@ int vfs_mkobj(struct dentry *, umode_t,
void *);

int vfs_fchown(struct file *file, uid_t user, gid_t group);
+int vfs_fchmod(struct file *file, umode_t mode);

extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

--
2.43.0