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author <dwmw2@shinybook.infradead.org>2005-04-29 16:08:28 +0100
committer <dwmw2@shinybook.infradead.org>2005-04-29 16:08:28 +0100
commit2fd6f58ba6efc82ea2c9c2630f7ff5ed9eeaf34a (patch)
tree87cf236a78ad242ae01f1b71c289131e6d1c0662 /kernel
parentea3834d9fb348fb1144ad3affea22df933eaf62e (diff)
downloadop-kernel-dev-2fd6f58ba6efc82ea2c9c2630f7ff5ed9eeaf34a.zip
op-kernel-dev-2fd6f58ba6efc82ea2c9c2630f7ff5ed9eeaf34a.tar.gz
[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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/auditsc.c22
1 files changed, 16 insertions, 6 deletions
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 @@ struct audit_context {
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 @@ struct audit_context {
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 @@ static int audit_filter_rules(struct task_struct *tsk,
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 @@ static int audit_filter_rules(struct task_struct *tsk,
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 @@ static void audit_log_exit(struct audit_context *context)
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 @@ static inline unsigned int audit_serial(void)
* 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 @@ void audit_syscall_entry(struct task_struct *tsk, int major,
if (!audit_enabled)
return;
+ context->arch = arch;
context->major = major;
context->argv[0] = a1;
context->argv[1] = a2;
@@ -850,13 +859,13 @@ void audit_syscall_entry(struct task_struct *tsk, int major,
* 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 @@ void audit_syscall_exit(struct task_struct *tsk, int return_code)
context->in_syscall = 0;
context->auditable = 0;
+
if (context->previous) {
struct audit_context *new_context = context->previous;
context->previous = NULL;
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