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authorEric W. Biederman <ebiederm@xmission.com>2016-11-16 22:06:51 -0600
committerEric W. Biederman <ebiederm@xmission.com>2016-11-22 13:21:00 -0600
commitf84df2a6f268de584a201e8911384a2d244876e3 (patch)
tree09976911531fe57cff9299cd8687ae6d1c9b14ed /include
parent84d77d3f06e7e8dea057d10e8ec77ad71f721be3 (diff)
exec: Ensure mm->user_ns contains the execed files
When the user namespace support was merged the need to prevent ptrace from revealing the contents of an unreadable executable was overlooked. Correct this oversight by ensuring that the executed file or files are in mm->user_ns, by adjusting mm->user_ns. Use the new function privileged_wrt_inode_uidgid to see if the executable is a member of the user namespace, and as such if having CAP_SYS_PTRACE in the user namespace should allow tracing the executable. If not update mm->user_ns to the parent user namespace until an appropriate parent is found. Cc: stable@vger.kernel.org Reported-by: Jann Horn <jann@thejh.net> Fixes: 9e4a36ece652 ("userns: Fail exec for suid and sgid binaries with ids outside our user namespace.") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/capability.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h
index d6088e2a7668..6ffb67e10c06 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -240,6 +240,7 @@ static inline bool ns_capable_noaudit(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);
extern bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap);
extern bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns);