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| author | Eric W. Biederman <ebiederm@xmission.com> | 2013-03-15 01:03:33 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2013-03-17 17:16:16 -0700 |
| commit | 92f28d973cce45ef5823209aab3138eb45d8b349 (patch) | |
| tree | 069609531cff66b163ac17f29a8a1ce957d020ef /net/core | |
| parent | a937536b868b8369b98967929045f1df54234323 (diff) | |
| download | linux-92f28d973cce45ef5823209aab3138eb45d8b349.tar.gz linux-92f28d973cce45ef5823209aab3138eb45d8b349.tar.bz2 linux-92f28d973cce45ef5823209aab3138eb45d8b349.zip | |
scm: Require CAP_SYS_ADMIN over the current pidns to spoof pids.
Don't allow spoofing pids over unix domain sockets in the corner
cases where a user has created a user namespace but has not yet
created a pid namespace.
Cc: stable@vger.kernel.org
Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/scm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/core/scm.c b/net/core/scm.c index 905dcc6ad1e3..2dc6cdaaae8a 100644 --- a/net/core/scm.c +++ b/net/core/scm.c @@ -24,6 +24,7 @@ #include <linux/interrupt.h> #include <linux/netdevice.h> #include <linux/security.h> +#include <linux/pid_namespace.h> #include <linux/pid.h> #include <linux/nsproxy.h> #include <linux/slab.h> @@ -52,7 +53,8 @@ static __inline__ int scm_check_creds(struct ucred *creds) if (!uid_valid(uid) || !gid_valid(gid)) return -EINVAL; - if ((creds->pid == task_tgid_vnr(current) || nsown_capable(CAP_SYS_ADMIN)) && + if ((creds->pid == task_tgid_vnr(current) || + ns_capable(current->nsproxy->pid_ns->user_ns, CAP_SYS_ADMIN)) && ((uid_eq(uid, cred->uid) || uid_eq(uid, cred->euid) || uid_eq(uid, cred->suid)) || nsown_capable(CAP_SETUID)) && ((gid_eq(gid, cred->gid) || gid_eq(gid, cred->egid) || |