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authorEric Paris <eparis@redhat.com>2012-01-03 14:23:05 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-17 16:16:55 -0500
commit85e7bac33b8d5edafc4e219c7dfdb3d48e0b4e31 (patch)
tree6a1f178de829d2219a65a8563e12f2c8029d4b13
parent16c174bd95cb07c9d0ad3fcd8c70f9cea7214c9d (diff)
seccomp: audit abnormal end to a process due to seccomp
The audit system likes to collect information about processes that end abnormally (SIGSEGV) as this may me useful intrusion detection information. This patch adds audit support to collect information when seccomp forces a task to exit because of misbehavior in a similar way. Signed-off-by: Eric Paris <eparis@redhat.com>
-rw-r--r--include/linux/audit.h8
-rw-r--r--kernel/auditsc.c50
-rw-r--r--kernel/seccomp.c2
3 files changed, 39 insertions, 21 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 426ab9f4dd8..6e1c533f9b4 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -430,6 +430,7 @@ extern void audit_putname(const char *name);
extern void __audit_inode(const char *name, const struct dentry *dentry);
extern void __audit_inode_child(const struct dentry *dentry,
const struct inode *parent);
+extern void __audit_seccomp(unsigned long syscall);
extern void __audit_ptrace(struct task_struct *t);
static inline int audit_dummy_context(void)
@@ -453,6 +454,12 @@ static inline void audit_inode_child(const struct dentry *dentry,
}
void audit_core_dumps(long signr);
+static inline void audit_seccomp(unsigned long syscall)
+{
+ if (unlikely(!audit_dummy_context()))
+ __audit_seccomp(syscall);
+}
+
static inline void audit_ptrace(struct task_struct *t)
{
if (unlikely(!audit_dummy_context()))
@@ -558,6 +565,7 @@ extern int audit_signals;
#define audit_inode(n,d) do { (void)(d); } while (0)
#define audit_inode_child(i,p) do { ; } while (0)
#define audit_core_dumps(i) do { ; } while (0)
+#define audit_seccomp(i) do { ; } while (0)
#define auditsc_get_stamp(c,t,s) (0)
#define audit_get_loginuid(t) (-1)
#define audit_get_sessionid(t) (-1)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 7c495147c3d..e9bcb93800d 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2529,6 +2529,25 @@ void __audit_mmap_fd(int fd, int flags)
context->type = AUDIT_MMAP;
}
+static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
+{
+ uid_t auid, uid;
+ gid_t gid;
+ unsigned int sessionid;
+
+ auid = audit_get_loginuid(current);
+ sessionid = audit_get_sessionid(current);
+ current_uid_gid(&uid, &gid);
+
+ audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
+ auid, uid, gid, sessionid);
+ audit_log_task_context(ab);
+ audit_log_format(ab, " pid=%d comm=", current->pid);
+ audit_log_untrustedstring(ab, current->comm);
+ audit_log_format(ab, " reason=");
+ audit_log_string(ab, reason);
+ audit_log_format(ab, " sig=%ld", signr);
+}
/**
* audit_core_dumps - record information about processes that end abnormally
* @signr: signal value
@@ -2539,10 +2558,6 @@ void __audit_mmap_fd(int fd, int flags)
void audit_core_dumps(long signr)
{
struct audit_buffer *ab;
- u32 sid;
- uid_t auid = audit_get_loginuid(current), uid;
- gid_t gid;
- unsigned int sessionid = audit_get_sessionid(current);
if (!audit_enabled)
return;
@@ -2551,24 +2566,17 @@ void audit_core_dumps(long signr)
return;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
- current_uid_gid(&uid, &gid);
- audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
- auid, uid, gid, sessionid);
- security_task_getsecid(current, &sid);
- if (sid) {
- char *ctx = NULL;
- u32 len;
+ audit_log_abend(ab, "memory violation", signr);
+ audit_log_end(ab);
+}
- if (security_secid_to_secctx(sid, &ctx, &len))
- audit_log_format(ab, " ssid=%u", sid);
- else {
- audit_log_format(ab, " subj=%s", ctx);
- security_release_secctx(ctx, len);
- }
- }
- audit_log_format(ab, " pid=%d comm=", current->pid);
- audit_log_untrustedstring(ab, current->comm);
- audit_log_format(ab, " sig=%ld", signr);
+void __audit_seccomp(unsigned long syscall)
+{
+ struct audit_buffer *ab;
+
+ ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+ audit_log_abend(ab, "seccomp", SIGKILL);
+ audit_log_format(ab, " syscall=%ld", syscall);
audit_log_end(ab);
}
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 57d4b13b631..e8d76c5895e 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -6,6 +6,7 @@
* This defines a simple but solid secure-computing mode.
*/
+#include <linux/audit.h>
#include <linux/seccomp.h>
#include <linux/sched.h>
#include <linux/compat.h>
@@ -54,6 +55,7 @@ void __secure_computing(int this_syscall)
#ifdef SECCOMP_DEBUG
dump_stack();
#endif
+ audit_seccomp(this_syscall);
do_exit(SIGKILL);
}