[AUDIT] Don't allow ptrace to fool auditing, log arch of audited syscalls.
We were calling ptrace_notify() after auditing the syscall and arguments,
but the debugger could have _changed_ them before the syscall was actually
invoked. Reorder the calls to fix that.
While we're touching ever call to audit_syscall_entry(), we also make it
take an extra argument: the architecture of the syscall which was made,
because some architectures allow more than one type of syscall.
Also add an explicit success/failure flag to audit_syscall_exit(), for
the benefit of architectures which return that in a condition register
rather than only returning a single register.
Change type of syscall return value to 'long' not 'int'.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 00e87ff..77e9259 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -123,7 +123,7 @@
int major; /* syscall number */
unsigned long argv[4]; /* syscall arguments */
int return_valid; /* return code is valid */
- int return_code;/* syscall return code */
+ long return_code;/* syscall return code */
int auditable; /* 1 if record should be written */
int name_count;
struct audit_names names[AUDIT_NAMES];
@@ -135,6 +135,7 @@
uid_t uid, euid, suid, fsuid;
gid_t gid, egid, sgid, fsgid;
unsigned long personality;
+ int arch;
#if AUDIT_DEBUG
int put_count;
@@ -348,6 +349,10 @@
case AUDIT_PERS:
result = (tsk->personality == value);
break;
+ case AUDIT_ARCH:
+ if (ctx)
+ result = (ctx->arch == value);
+ break;
case AUDIT_EXIT:
if (ctx && ctx->return_valid)
@@ -355,7 +360,7 @@
break;
case AUDIT_SUCCESS:
if (ctx && ctx->return_valid)
- result = (ctx->return_code >= 0);
+ result = (ctx->return_valid == AUDITSC_SUCCESS);
break;
case AUDIT_DEVMAJOR:
if (ctx) {
@@ -648,8 +653,11 @@
audit_log_format(ab, "syscall=%d", context->major);
if (context->personality != PER_LINUX)
audit_log_format(ab, " per=%lx", context->personality);
+ audit_log_format(ab, " arch=%x", context->arch);
if (context->return_valid)
- audit_log_format(ab, " exit=%d", context->return_code);
+ audit_log_format(ab, " success=%s exit=%ld",
+ (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
+ context->return_code);
audit_log_format(ab,
" a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
" pid=%d loginuid=%d uid=%d gid=%d"
@@ -773,7 +781,7 @@
* then the record will be written at syscall exit time (otherwise, it
* will only be written if another part of the kernel requests that it
* be written). */
-void audit_syscall_entry(struct task_struct *tsk, int major,
+void audit_syscall_entry(struct task_struct *tsk, int arch, int major,
unsigned long a1, unsigned long a2,
unsigned long a3, unsigned long a4)
{
@@ -827,6 +835,7 @@
if (!audit_enabled)
return;
+ context->arch = arch;
context->major = major;
context->argv[0] = a1;
context->argv[1] = a2;
@@ -850,13 +859,13 @@
* filtering, or because some other part of the kernel write an audit
* message), then write out the syscall information. In call cases,
* free the names stored from getname(). */
-void audit_syscall_exit(struct task_struct *tsk, int return_code)
+void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code)
{
struct audit_context *context;
get_task_struct(tsk);
task_lock(tsk);
- context = audit_get_context(tsk, 1, return_code);
+ context = audit_get_context(tsk, valid, return_code);
task_unlock(tsk);
/* Not having a context here is ok, since the parent may have
@@ -869,6 +878,7 @@
context->in_syscall = 0;
context->auditable = 0;
+
if (context->previous) {
struct audit_context *new_context = context->previous;
context->previous = NULL;
