This has no functional change. Just create and export inode_sgid_strip
api for the subsequent patch. This function is used to strip inode's
S_ISGID mode when init a new inode.
Reviewed-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
---
fs/inode.c | 37 +++++++++++++++++++++++++++++++++----
include/linux/fs.h | 2 ++
2 files changed, 35 insertions(+), 4 deletions(-)
diff --git a/fs/inode.c b/fs/inode.c
index 9d9b422504d1..78e7ef567e04 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2246,10 +2246,8 @@ void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
/* 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(i_gid_into_mnt(mnt_userns, dir)) &&
- !capable_wrt_inode_uidgid(mnt_userns, dir, CAP_FSETID))
- mode &= ~S_ISGID;
+ else
+ mode = inode_sgid_strip(mnt_userns, dir, mode);
} else
inode_fsgid_set(inode, mnt_userns);
inode->i_mode = mode;
@@ -2405,3 +2403,34 @@ struct timespec64 current_time(struct inode *inode)
return timestamp_truncate(now, inode);
}
EXPORT_SYMBOL(current_time);
+
+/**
+ * inode_sgid_strip - handle the sgid bit for non-directories
+ * @mnt_userns: User namespace of the mount the inode was created from
+ * @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 inode_sgid_strip(struct user_namespace *mnt_userns,
+ const struct inode *dir, umode_t mode)
+{
+ if (S_ISDIR(mode) || !dir || !(dir->i_mode & S_ISGID))
+ return mode;
+ if ((mode & (S_ISGID | S_IXGRP)) != (S_ISGID | S_IXGRP))
+ return mode;
+ if (in_group_p(i_gid_into_mnt(mnt_userns, dir)))
+ return mode;
+ if (capable_wrt_inode_uidgid(mnt_userns, dir, CAP_FSETID))
+ return mode;
+
+ mode &= ~S_ISGID;
+ return mode;
+}
+EXPORT_SYMBOL(inode_sgid_strip);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bbde95387a23..532de76c9b91 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1897,6 +1897,8 @@ extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
const struct inode *dir, umode_t mode);
extern bool may_open_dev(const struct path *path);
+umode_t inode_sgid_strip(struct user_namespace *mnt_userns,
+ const struct inode *dir, umode_t mode);
/*
* This is the "filldir" function type, used by readdir() to let
--
2.27.0
