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Commit d9cfea91 authored by Richard Guy Briggs's avatar Richard Guy Briggs Committed by Eric Paris
Browse files

audit: move audit_aux_data_execve contents into audit_context union 



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: default avatarOleg Nesterov <onestero@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: default avatarRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 9462dc59

include/linux/audit.h

+2 −2
Original line number Diff line number Diff line
@@ -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)

kernel/audit.h

+4 −0
Original line number Diff line number Diff line
@@ -197,6 +197,10 @@ struct audit_context { 
			int			fd;

			int			flags;

		} mmap;

		struct {

			int			argc;

			struct mm_struct	*mm;

		} execve;

	};

	int fds[2];

kernel/auditsc.c

+12 −29
Original line number Diff line number Diff line
@@ -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;

}