A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 19:21:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

fuse: Restrict allow_other to the superblock's namespace or a descendant

Browse source 
Unprivileged users are normally restricted from mounting with the
allow_other option by system policy, but this could be bypassed for a mount
done with user namespace root permissions. In such cases allow_other should
not allow users outside the userns to access the mount as doing so would
give the unprivileged user the ability to manipulate processes it would
otherwise be unable to manipulate. Restrict allow_other to apply to users
in the same userns used at mount or a descendant of that namespace. Also
export current_in_userns() for use by fuse when built as a module.

Reviewed-by: Serge Hallyn <[email protected]>
Signed-off-by: Seth Forshee <[email protected]>
Signed-off-by: Dongsu Park <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
This commit is contained in:
Seth Forshee 2017-12-22 15:32:33 +01:00 • committed by Miklos Szeredi
commit 73f03c2b4b
2 changed files with 2 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/fuse/dir.c
View file

@ -1030,7 +1030,7 @@ int fuse_allow_current_process(struct fuse_conn *fc)
const struct cred *cred;
if (fc->allow_other)
return 1;
return current_in_userns(fc->user_ns);
cred = current_cred();
if (uid_eq(cred->euid, fc->user_id) &&