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parisc/ptrace: run seccomp after ptrace 

Close the hole where ptrace can change a syscall out from under seccomp.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
This commit is contained in:
Kees Cook 2016-06-02 13:15:52 -07:00
parent 2ac3c8d18e
commit 375f018304
1 changed files with 5 additions and 4 deletions
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9
arch/parisc/kernel/ptrace.c
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@ -311,10 +311,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
long do_syscall_trace_enter(struct pt_regs *regs)
{
/* Do the secure computing check first. */
if (secure_computing(NULL) == -1)
return -1;
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
tracehook_report_syscall_entry(regs)) {
/*
@ -325,6 +321,11 @@ long do_syscall_trace_enter(struct pt_regs *regs)
regs->gr[20] = -1UL;
goto out;
}
/* Do the secure computing check after ptrace. */
if (secure_computing(NULL) == -1)
return -1;
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->gr[20]);