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authorEric W. Biederman <ebiederm@xmission.com>2017-01-04 07:37:27 +0300
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 03:34:55 +0300
commit75422726b0f717d67db3283c2eb5bc14fa2619c5 (patch)
tree166111b615cc1e00e809eff6186146e09785c524 /fs
parent3895dbf8985f656675b5bde610723a29cbce3fa7 (diff)
downloadlinux-75422726b0f717d67db3283c2eb5bc14fa2619c5.tar.xz
libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
Add MS_KERNMOUNT to the flags that are passed. Use sget_userns and force &init_user_ns instead of calling sget so that even if called from a weird context the internal filesystem will be considered to be in the intial user namespace. Luis Ressel reported that the the failure to pass MS_KERNMOUNT into mount_pseudo broke his in development graphics driver that uses the generic drm infrastructure. I am not certain the deriver was bug free in it's usage of that infrastructure but since mount_pseudo_xattr can never be triggered by userspace it is clearer and less error prone, and less problematic for the code to be explicit. Reported-by: Luis Ressel <aranea@aixah.de> Tested-by: Luis Ressel <aranea@aixah.de> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/libfs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/libfs.c b/fs/libfs.c
index e973cd51f126..28d6f35feed6 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -245,7 +245,8 @@ struct dentry *mount_pseudo_xattr(struct file_system_type *fs_type, char *name,
struct inode *root;
struct qstr d_name = QSTR_INIT(name, strlen(name));
- s = sget(fs_type, NULL, set_anon_super, MS_NOUSER, NULL);
+ s = sget_userns(fs_type, NULL, set_anon_super, MS_KERNMOUNT|MS_NOUSER,
+ &init_user_ns, NULL);
if (IS_ERR(s))
return ERR_CAST(s);