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kernel: extend seccomp with a LOG action 

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 45007
owl
John Crispin 2015-03-26 10:58:03 +00:00
parent d95e0687aa
commit c67144cc05
1 changed files with 34 additions and 0 deletions
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34
target/linux/generic/patches-3.18/999-seccomp_log.patch Normal file
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@ -0,0 +1,34 @@
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -614,6 +614,7 @@
#ifdef CONFIG_SECCOMP_FILTER
static u32 __seccomp_phase1_filter(int this_syscall, struct seccomp_data *sd)
{
+ char name[sizeof(current->comm)];
u32 filter_ret, action;
int data;
@@ -644,6 +645,13 @@
case SECCOMP_RET_TRACE:
return filter_ret; /* Save the rest for phase 2. */
+ case SECCOMP_RET_LOG:
+ get_task_comm(name, current);
+ pr_err_ratelimited("seccomp: %s [%u] tried to call non-whitelisted syscall: %d\n", name, current->pid, this_syscall);
+ syscall_set_return_value(current, task_pt_regs(current),
+ -data, 0);
+ goto skip;
+
case SECCOMP_RET_ALLOW:
return SECCOMP_PHASE1_OK;
--- a/include/uapi/linux/seccomp.h
+++ b/include/uapi/linux/seccomp.h
@@ -28,6 +28,7 @@
#define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */
#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
+#define SECCOMP_RET_LOG 0x00070000U /* allow + logline */
#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
#define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */