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author | Seth Forshee <seth.forshee@canonical.com> | 2015-09-23 15:16:04 -0500 |
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committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-24 10:40:31 -0500 |
commit | d07b846f6200454c50d791796edb82660192513d (patch) | |
tree | 0addc4233c4e08fc7ca69511761bbd2c7402c1de /net | |
parent | cc50a07a247e17db76b1f0b0ca06652556e04fa3 (diff) | |
download | linux-d07b846f6200454c50d791796edb82660192513d.tar.bz2 |
fs: Limit file caps to the user namespace of the super block
Capability sets attached to files must be ignored except in the
user namespaces where the mounter is privileged, i.e. s_user_ns
and its descendants. Otherwise a vector exists for gaining
privileges in namespaces where a user is not already privileged.
Add a new helper function, current_in_user_ns(), to test whether a user
namespace is the same as or a descendant of another namespace.
Use this helper to determine whether a file's capability set
should be applied to the caps constructed during exec.
--EWB Replaced in_userns with the simpler current_in_userns.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions