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author | Eric W. Biederman <ebiederm@xmission.com> | 2012-12-14 08:50:54 -0800 |
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committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-12-14 18:36:26 -0800 |
commit | aa6d054e5ce94720797ca260392a74dbced56412 (patch) | |
tree | 4e7093d4e288238f0514187e87b13738504a21df /scripts/mod | |
parent | 5e4a08476b50fa39210fca82e03325cc46b9c235 (diff) | |
download | linux-aa6d054e5ce94720797ca260392a74dbced56412.tar.bz2 |
userns: Add a more complete capability subset test to commit_creds
When unsharing a user namespace we reduce our credentials to just what
can be done in that user namespace. This is a subset of the credentials
we previously had. Teach commit_creds to recognize this is a subset
of the credentials we have had before and don't clear the dumpability flag.
This allows an unprivileged program to do:
unshare(CLONE_NEWUSER);
fd = open("/proc/self/uid_map", O_RDWR);
Where previously opening the uid_map writable would fail because
the the task had been made non-dumpable.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'scripts/mod')
0 files changed, 0 insertions, 0 deletions