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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: David 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: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2017-06-13 15:28:47 -07:00 committed by Ralf Baechle
parent f381bf6d82
commit 669c409222
1 changed files with 20 additions and 2 deletions
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22
arch/mips/kernel/ptrace.c
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@ -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]);