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ptrace: do not audit capability check when outputing /proc/pid/stat

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Reading /proc/pid/stat of another process checks if one has ptrace permissions
on that process.  If one does have permissions it outputs some data about the
process which might have security and attack implications.  If the current
task does not have ptrace permissions the read still works, but those fields
are filled with inocuous (0) values.  Since this check and a subsequent denial
is not a violation of the security policy we should not audit such denials.

This can be quite useful to removing ptrace broadly across a system without
flooding the logs when ps is run or something which harmlessly walks proc.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
This commit is contained in:
Eric Paris
2012-01-03 12:25:15 -05:00
parent f1c84dae0e
commit 69f594a389
4 changed files with 15 additions and 6 deletions
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12
kernel/ptrace.c
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@ -161,6 +161,14 @@ int ptrace_check_attach(struct task_struct *child, bool ignore_state)
return ret;
}
static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
{
if (mode & PTRACE_MODE_NOAUDIT)
return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
else
return has_ns_capability(current, ns, CAP_SYS_PTRACE);
}
int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
const struct cred *cred = current_cred(), *tcred;
@ -187,7 +195,7 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
cred->gid == tcred->sgid &&
cred->gid == tcred->gid))
goto ok;
if (ns_capable(tcred->user->user_ns, CAP_SYS_PTRACE))
if (ptrace_has_cap(tcred->user->user_ns, mode))
goto ok;
rcu_read_unlock();
return -EPERM;
@ -196,7 +204,7 @@ ok:
smp_rmb();
if (task->mm)
dumpable = get_dumpable(task->mm);
if (!dumpable && !ns_capable(task_user_ns(task), CAP_SYS_PTRACE))
if (!dumpable && !ptrace_has_cap(task_user_ns(task), mode))
return -EPERM;
return security_ptrace_access_check(task, mode);