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-rw-r--r--kernel/seccomp.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index ee376be..5af44b5 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -396,25 +396,29 @@ int __secure_computing(int this_syscall)
#ifdef CONFIG_SECCOMP_FILTER
case SECCOMP_MODE_FILTER: {
int data;
+ struct pt_regs *regs = task_pt_regs(current);
ret = seccomp_run_filters(this_syscall);
data = ret & SECCOMP_RET_DATA;
ret &= SECCOMP_RET_ACTION;
switch (ret) {
case SECCOMP_RET_ERRNO:
/* Set the low-order 16-bits as a errno. */
- syscall_set_return_value(current, task_pt_regs(current),
+ syscall_set_return_value(current, regs,
-data, 0);
goto skip;
case SECCOMP_RET_TRAP:
/* Show the handler the original registers. */
- syscall_rollback(current, task_pt_regs(current));
+ syscall_rollback(current, regs);
/* Let the filter pass back 16 bits of data. */
seccomp_send_sigsys(this_syscall, data);
goto skip;
case SECCOMP_RET_TRACE:
/* Skip these calls if there is no tracer. */
- if (!ptrace_event_enabled(current, PTRACE_EVENT_SECCOMP))
+ if (!ptrace_event_enabled(current, PTRACE_EVENT_SECCOMP)) {
+ syscall_set_return_value(current, regs,
+ -ENOSYS, 0);
goto skip;
+ }
/* Allow the BPF to provide the event message */
ptrace_event(PTRACE_EVENT_SECCOMP, data);
/*
@@ -425,6 +429,9 @@ int __secure_computing(int this_syscall)
*/
if (fatal_signal_pending(current))
break;
+ if (syscall_get_nr(current, regs) < 0)
+ goto skip; /* Explicit request to skip. */
+
return 0;
case SECCOMP_RET_ALLOW:
return 0;
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