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audit: move audit_aux_data_execve contents into audit_context union

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audit_bprm() was being called to add an AUDIT_EXECVE record to the audit
context every time search_binary_handler() was recursively called.  Only one
reference is necessary, so just update it.  Move the the contents of
audit_aux_data_execve into the union in audit_context, removing dependence on a
kmalloc along the way.

Reported-by: Oleg Nesterov <onestero@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Richard Guy Briggs 2013-10-30 17:56:13 -04:00 committed by Eric Paris
parent 9462dc5981
commit d9cfea91e9
3 changed files with 18 additions and 31 deletions
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4
include/linux/audit.h
View File

@ -209,7 +209,7 @@ static inline int audit_get_sessionid(struct task_struct *tsk)
extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
extern int __audit_bprm(struct linux_binprm *bprm);
extern void __audit_bprm(struct linux_binprm *bprm);
extern int __audit_socketcall(int nargs, unsigned long *args);
extern int __audit_sockaddr(int len, void *addr);
extern void __audit_fd_pair(int fd1, int fd2);
@ -241,7 +241,7 @@ static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid
static inline int audit_bprm(struct linux_binprm *bprm)
{
if (unlikely(!audit_dummy_context()))
return __audit_bprm(bprm);
__audit_bprm(bprm);
return 0;
}
static inline int audit_socketcall(int nargs, unsigned long *args)

4
kernel/audit.h
View File

@ -197,6 +197,10 @@ struct audit_context {
int fd;
int flags;
} mmap;
struct {
int argc;
struct mm_struct *mm;
} execve;
};
int fds[2];

41
kernel/auditsc.c
View File

@ -95,12 +95,6 @@ struct audit_aux_data {
/* Number of target pids per aux struct. */
#define AUDIT_AUX_PIDS 16
struct audit_aux_data_execve {
struct audit_aux_data d;
int argc;
struct mm_struct *mm;
};
struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
@ -1144,20 +1138,19 @@ static int audit_log_single_execve_arg(struct audit_context *context,
}
static void audit_log_execve_info(struct audit_context *context,
struct audit_buffer **ab,
struct audit_aux_data_execve *axi)
struct audit_buffer **ab)
{
int i, len;
size_t len_sent = 0;
const char __user *p;
char *buf;
if (axi->mm != current->mm)
if (context->execve.mm != current->mm)
return; /* execve failed, no additional info */
p = (const char __user *)axi->mm->arg_start;
p = (const char __user *)current->mm->arg_start;
audit_log_format(*ab, "argc=%d", axi->argc);
audit_log_format(*ab, "argc=%d", context->execve.argc);
/*
* we need some kernel buffer to hold the userspace args. Just
@ -1171,7 +1164,7 @@ static void audit_log_execve_info(struct audit_context *context,
return;
}
for (i = 0; i < axi->argc; i++) {
for (i = 0; i < context->execve.argc; i++) {
len = audit_log_single_execve_arg(context, ab, i,
&len_sent, p, buf);
if (len <= 0)
@ -1274,6 +1267,9 @@ static void show_special(struct audit_context *context, int *call_panic)
audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
context->mmap.flags);
break; }
case AUDIT_EXECVE: {
audit_log_execve_info(context, &ab);
break; }
}
audit_log_end(ab);
}
@ -1320,11 +1316,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
switch (aux->type) {
case AUDIT_EXECVE: {
struct audit_aux_data_execve *axi = (void *)aux;
audit_log_execve_info(context, &ab, axi);
break; }
case AUDIT_BPRM_FCAPS: {
struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
audit_log_format(ab, "fver=%x", axs->fcap_ver);
@ -2147,21 +2138,13 @@ void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mo
context->ipc.has_perm = 1;
}
int __audit_bprm(struct linux_binprm *bprm)
void __audit_bprm(struct linux_binprm *bprm)
{
struct audit_aux_data_execve *ax;
struct audit_context *context = current->audit_context;
ax = kmalloc(sizeof(*ax), GFP_KERNEL);
if (!ax)
return -ENOMEM;
ax->argc = bprm->argc;
ax->mm = bprm->mm;
ax->d.type = AUDIT_EXECVE;
ax->d.next = context->aux;
context->aux = (void *)ax;
return 0;
context->type = AUDIT_EXECVE;
context->execve.argc = bprm->argc;
context->execve.mm = bprm->mm;
}