[1/2] fs: add mode_strip_sgid() helper

Commit Message

Mahmoud Adam Jan. 24, 2024, 1 p.m. UTC

From: Yang Xu <[e-mail]>

commit 2b3416ceff5e6bd4922f6d1c61fb68113dd82302 upstream.

[remove userns argument of helper for 5.4.y backport]

Add a dedicated helper to handle the setgid bit when creating a new file
in a setgid directory. This is a preparatory patch for moving setgid
stripping into the vfs. The patch contains no functional changes.

Currently the setgid stripping logic is open-coded directly in
inode_init_owner() and the individual filesystems are responsible for
handling setgid inheritance. Since this has proven to be brittle as
evidenced by old issues we uncovered over the last months (see [1] to
[3] below) we will try to move this logic into the vfs.

Link: e014f37db1a2 ("xfs: use setattr_copy to set vfs inode attributes") [1]
Link: 01ea173e103e ("xfs: fix up non-directory creation in SGID directories") [2]
Link: fd84bfdddd16 ("ceph: fix up non-directory creation in SGID directories") [3]
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Darrick J. Wong <[e-mail]>
Reviewed-by: Christian Brauner (Microsoft) <[e-mail]>
Reviewed-and-Tested-by: Jeff Layton <[e-mail]>
Signed-off-by: Yang Xu <[e-mail]>
Signed-off-by: Christian Brauner (Microsoft) <[e-mail]>
Signed-off-by: Amir Goldstein <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
[commit 347750e1b69cef62966fbc5bd7dc579b4c00688a upstream
	backported from 5.10.y, resolved context conflicts]
Signed-off-by: Mahmoud Adam <[e-mail]>
---
 fs/inode.c         | 34 ++++++++++++++++++++++++++++++----
 include/linux/fs.h |  1 +
 2 files changed, 31 insertions(+), 4 deletions(-)

Patch

diff --git a/fs/inode.c b/fs/inode.c
index f7c8c0fe11d4..2995130e0cdc 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2100,10 +2100,8 @@  void inode_init_owner(struct inode *inode, const struct inode *dir,
 		/* Directories are special, and always inherit S_ISGID */
 		if (S_ISDIR(mode))
 			mode |= S_ISGID;
-		else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
-			 !in_group_p(inode->i_gid) &&
-			 !capable_wrt_inode_uidgid(dir, CAP_FSETID))
-			mode &= ~S_ISGID;
+		else
+			mode = mode_strip_sgid(dir, mode);
 	} else
 		inode->i_gid = current_fsgid();
 	inode->i_mode = mode;
@@ -2359,3 +2357,31 @@  int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
 	return 0;
 }
 EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);
+
+/**
+ * mode_strip_sgid - handle the sgid bit for non-directories
+ * @dir: parent directory inode
+ * @mode: mode of the file to be created in @dir
+ *
+ * If the @mode of the new file has both the S_ISGID and S_IXGRP bit
+ * raised and @dir has the S_ISGID bit raised ensure that the caller is
+ * either in the group of the parent directory or they have CAP_FSETID
+ * in their user namespace and are privileged over the parent directory.
+ * In all other cases, strip the S_ISGID bit from @mode.
+ *
+ * Return: the new mode to use for the file
+ */
+umode_t mode_strip_sgid(const struct inode *dir, umode_t mode)
+{
+	if ((mode & (S_ISGID | S_IXGRP)) != (S_ISGID | S_IXGRP))
+		return mode;
+	if (S_ISDIR(mode) || !dir || !(dir->i_mode & S_ISGID))
+		return mode;
+	if (in_group_p(dir->i_gid))
+		return mode;
+	if (capable_wrt_inode_uidgid(dir, CAP_FSETID))
+		return mode;
+
+	return mode & ~S_ISGID;
+}
+EXPORT_SYMBOL(mode_strip_sgid);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index fbbd7ef7f653..d9b97ccd65e5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1743,6 +1743,7 @@  extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
 			umode_t mode);
 extern bool may_open_dev(const struct path *path);
+umode_t mode_strip_sgid(const struct inode *dir, umode_t mode);
 /*
  * VFS FS_IOC_FIEMAP helper definitions.
  */