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authorSteven Rostedt (Google) <rostedt@goodmis.org>2024-05-02 23:08:24 +0300
committerSteven Rostedt (Google) <rostedt@goodmis.org>2024-05-04 11:25:37 +0300
commit6599bd5517be66c8344f869f3ca3a91bc10f2b9e (patch)
treeb846a8c55856a055072ac758e536ca22be8aab6d /fs/tracefs
parentbaa23a8d4360d981a49913841a726edede5cdd54 (diff)
downloadlinux-6599bd5517be66c8344f869f3ca3a91bc10f2b9e.tar.xz
tracefs: Still use mount point as default permissions for instances
If the instances directory's permissions were never change, then have it and its children use the mount point permissions as the default. Currently, the permissions of instance directories are determined by the instance directory's permissions itself. But if the tracefs file system is remounted and changes the permissions, the instance directory and its children should use the new permission. But because both the instance directory and its children use the instance directory's inode for permissions, it misses the update. To demonstrate this: # cd /sys/kernel/tracing/ # mkdir instances/foo # ls -ld instances/foo drwxr-x--- 5 root root 0 May 1 19:07 instances/foo # ls -ld instances drwxr-x--- 3 root root 0 May 1 18:57 instances # ls -ld current_tracer -rw-r----- 1 root root 0 May 1 18:57 current_tracer # mount -o remount,gid=1002 . # ls -ld instances drwxr-x--- 3 root root 0 May 1 18:57 instances # ls -ld instances/foo/ drwxr-x--- 5 root root 0 May 1 19:07 instances/foo/ # ls -ld current_tracer -rw-r----- 1 root lkp 0 May 1 18:57 current_tracer Notice that changing the group id to that of "lkp" did not affect the instances directory nor its children. It should have been: # ls -ld current_tracer -rw-r----- 1 root root 0 May 1 19:19 current_tracer # ls -ld instances/foo/ drwxr-x--- 5 root root 0 May 1 19:25 instances/foo/ # ls -ld instances drwxr-x--- 3 root root 0 May 1 19:19 instances # mount -o remount,gid=1002 . # ls -ld current_tracer -rw-r----- 1 root lkp 0 May 1 19:19 current_tracer # ls -ld instances drwxr-x--- 3 root lkp 0 May 1 19:19 instances # ls -ld instances/foo/ drwxr-x--- 5 root lkp 0 May 1 19:25 instances/foo/ Where all files were updated by the remount gid update. Link: https://lore.kernel.org/linux-trace-kernel/20240502200905.686838327@goodmis.org Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Fixes: 8186fff7ab649 ("tracefs/eventfs: Use root and instance inodes as default ownership") Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'fs/tracefs')
-rw-r--r--fs/tracefs/inode.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index 52aa14bd2994..417c840e6403 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -180,16 +180,39 @@ static void set_tracefs_inode_owner(struct inode *inode)
{
struct tracefs_inode *ti = get_tracefs(inode);
struct inode *root_inode = ti->private;
+ kuid_t uid;
+ kgid_t gid;
+
+ uid = root_inode->i_uid;
+ gid = root_inode->i_gid;
+
+ /*
+ * If the root is not the mount point, then check the root's
+ * permissions. If it was never set, then default to the
+ * mount point.
+ */
+ if (root_inode != d_inode(root_inode->i_sb->s_root)) {
+ struct tracefs_inode *rti;
+
+ rti = get_tracefs(root_inode);
+ root_inode = d_inode(root_inode->i_sb->s_root);
+
+ if (!(rti->flags & TRACEFS_UID_PERM_SET))
+ uid = root_inode->i_uid;
+
+ if (!(rti->flags & TRACEFS_GID_PERM_SET))
+ gid = root_inode->i_gid;
+ }
/*
* If this inode has never been referenced, then update
* the permissions to the superblock.
*/
if (!(ti->flags & TRACEFS_UID_PERM_SET))
- inode->i_uid = root_inode->i_uid;
+ inode->i_uid = uid;
if (!(ti->flags & TRACEFS_GID_PERM_SET))
- inode->i_gid = root_inode->i_gid;
+ inode->i_gid = gid;
}
static int tracefs_permission(struct mnt_idmap *idmap,