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Commit 669c4092 authored by David Daney's avatar David Daney Committed by Ralf Baechle
Browse files

MIPS: Give __secure_computing() access to syscall arguments. 



KProbes of __seccomp_filter() are not very useful without access to
the syscall arguments.

Do what x86 does, and populate a struct seccomp_data to be passed to
__secure_computing().  This allows samples/bpf/tracex5 to extract a
sensible trace.

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16368/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent f381bf6d

arch/mips/kernel/ptrace.c

+20 −2
Original line number Diff line number Diff line
@@ -868,8 +868,26 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall) 
	    tracehook_report_syscall_entry(regs))

		return -1;



	if (secure_computing(NULL) == -1)

		return -1;

#ifdef CONFIG_SECCOMP

	if (unlikely(test_thread_flag(TIF_SECCOMP))) {

		int ret, i;

		struct seccomp_data sd;



		sd.nr = syscall;

		sd.arch = syscall_get_arch();

		for (i = 0; i < 6; i++) {

			unsigned long v, r;



			r = mips_get_syscall_arg(&v, current, regs, i);

			sd.args[i] = r ? 0 : v;

		}

		sd.instruction_pointer = KSTK_EIP(current);



		ret = __secure_computing(&sd);

		if (ret == -1)

			return ret;

	}

#endif



	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))

		trace_sys_enter(regs, regs->regs[2]);