diff options
| author | Micah Morton <mortonm@chromium.org> | 2019-01-23 01:42:09 +0300 |
|---|---|---|
| committer | James Morris <james.morris@microsoft.com> | 2019-01-25 22:22:43 +0300 |
| commit | 40852275a94afb3e836be9248399e036982d1a79 (patch) | |
| tree | 97db7b5d7dfae0ecd678b57bc861e60e949afe44 /include/linux/capability.h | |
| parent | 4b42564181d683d767b495d7041b1f229468042f (diff) | |
| download | linux-40852275a94afb3e836be9248399e036982d1a79.tar.xz | |
LSM: add SafeSetID module that gates setid calls
This change ensures that the set*uid family of syscalls in kernel/sys.c
(setreuid, setuid, setresuid, setfsuid) all call ns_capable_common with
the CAP_OPT_INSETID flag, so capability checks in the security_capable
hook can know whether they are being called from within a set*uid
syscall. This change is a no-op by itself, but is needed for the
proposed SafeSetID LSM.
Signed-off-by: Micah Morton <mortonm@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'include/linux/capability.h')
| -rw-r--r-- | include/linux/capability.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h index f640dcbc880c..c3f9a4d558a0 100644 --- a/include/linux/capability.h +++ b/include/linux/capability.h @@ -209,6 +209,7 @@ extern bool has_ns_capability_noaudit(struct task_struct *t, extern bool capable(int cap); extern bool ns_capable(struct user_namespace *ns, int cap); extern bool ns_capable_noaudit(struct user_namespace *ns, int cap); +extern bool ns_capable_setid(struct user_namespace *ns, int cap); #else static inline bool has_capability(struct task_struct *t, int cap) { @@ -240,6 +241,10 @@ static inline bool ns_capable_noaudit(struct user_namespace *ns, int cap) { return true; } +static inline bool ns_capable_setid(struct user_namespace *ns, int cap) +{ + return true; +} #endif /* CONFIG_MULTIUSER */ extern bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *inode); extern bool capable_wrt_inode_uidgid(const struct inode *inode, int cap); |