Commit db349509 authored by Al Viro's avatar Al Viro
Browse files

[PATCH] AUDIT_FD_PAIR



Provide an audit record of the descriptor pair returned by pipe() and
socketpair().  Rewritten from the original posted to linux-audit by
John D. Ramsdell <ramsdell@mitre.org>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 6a01b07f
......@@ -16,6 +16,7 @@
#include <linux/uio.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/audit.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
......@@ -985,6 +986,10 @@ int do_pipe(int *fd)
goto err_fdr;
fdw = error;
error = audit_fd_pair(fdr, fdw);
if (error < 0)
goto err_fdw;
fd_install(fdr, fr);
fd_install(fdw, fw);
fd[0] = fdr;
......@@ -992,6 +997,8 @@ int do_pipe(int *fd)
return 0;
err_fdw:
put_unused_fd(fdw);
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
......
......@@ -89,6 +89,7 @@
#define AUDIT_MQ_NOTIFY 1314 /* POSIX MQ notify record type */
#define AUDIT_MQ_GETSETATTR 1315 /* POSIX MQ get/set attribute record type */
#define AUDIT_KERNEL_OTHER 1316 /* For use by 3rd party modules */
#define AUDIT_FD_PAIR 1317 /* audit record for pipe/socketpair */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
......@@ -387,6 +388,7 @@ extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode
extern int audit_bprm(struct linux_binprm *bprm);
extern int audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
extern int __audit_fd_pair(int fd1, int fd2);
extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
extern int audit_set_macxattr(const char *name);
extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
......@@ -401,6 +403,12 @@ static inline int audit_ipc_obj(struct kern_ipc_perm *ipcp)
return __audit_ipc_obj(ipcp);
return 0;
}
static inline int audit_fd_pair(int fd1, int fd2)
{
if (unlikely(!audit_dummy_context()))
return __audit_fd_pair(fd1, fd2);
return 0;
}
static inline int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
{
if (unlikely(!audit_dummy_context()))
......@@ -459,6 +467,7 @@ extern int audit_n_rules;
#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
#define audit_bprm(p) ({ 0; })
#define audit_socketcall(n,a) ({ 0; })
#define audit_fd_pair(n,a) ({ 0; })
#define audit_sockaddr(len, addr) ({ 0; })
#define audit_avc_path(dentry, mnt) ({ 0; })
#define audit_set_macxattr(n) do { ; } while (0)
......
......@@ -170,6 +170,11 @@ struct audit_aux_data_sockaddr {
char a[0];
};
struct audit_aux_data_fd_pair {
struct audit_aux_data d;
int fd[2];
};
struct audit_aux_data_path {
struct audit_aux_data d;
struct dentry *dentry;
......@@ -961,6 +966,11 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_d_path(ab, "path=", axi->dentry, axi->mnt);
break; }
case AUDIT_FD_PAIR: {
struct audit_aux_data_fd_pair *axs = (void *)aux;
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
break; }
}
audit_log_end(ab);
}
......@@ -1814,6 +1824,36 @@ int audit_socketcall(int nargs, unsigned long *args)
return 0;
}
/**
* __audit_fd_pair - record audit data for pipe and socketpair
* @fd1: the first file descriptor
* @fd2: the second file descriptor
*
* Returns 0 for success or NULL context or < 0 on error.
*/
int __audit_fd_pair(int fd1, int fd2)
{
struct audit_context *context = current->audit_context;
struct audit_aux_data_fd_pair *ax;
if (likely(!context)) {
return 0;
}
ax = kmalloc(sizeof(*ax), GFP_KERNEL);
if (!ax) {
return -ENOMEM;
}
ax->fd[0] = fd1;
ax->fd[1] = fd2;
ax->d.type = AUDIT_FD_PAIR;
ax->d.next = context->aux;
context->aux = (void *)ax;
return 0;
}
/**
* audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
* @len: data length in user space
......
......@@ -1194,6 +1194,7 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
{
struct socket *sock1, *sock2;
int fd1, fd2, err;
struct file *newfile1, *newfile2;
/*
* Obtain the first socket and check if the underlying protocol
......@@ -1212,18 +1213,37 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
if (err < 0)
goto out_release_both;
fd1 = fd2 = -1;
fd1 = sock_alloc_fd(&newfile1);
if (unlikely(fd1 < 0))
goto out_release_both;
err = sock_map_fd(sock1);
if (err < 0)
fd2 = sock_alloc_fd(&newfile2);
if (unlikely(fd2 < 0)) {
put_filp(newfile1);
put_unused_fd(fd1);
goto out_release_both;
fd1 = err;
}
err = sock_map_fd(sock2);
if (err < 0)
goto out_close_1;
fd2 = err;
err = sock_attach_fd(sock1, newfile1);
if (unlikely(err < 0)) {
goto out_fd2;
}
err = sock_attach_fd(sock2, newfile2);
if (unlikely(err < 0)) {
fput(newfile1);
goto out_fd1;
}
err = audit_fd_pair(fd1, fd2);
if (err < 0) {
fput(newfile1);
fput(newfile2);
goto out_fd;
}
fd_install(fd1, newfile1);
fd_install(fd2, newfile2);
/* fd1 and fd2 may be already another descriptors.
* Not kernel problem.
*/
......@@ -1238,17 +1258,23 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
sys_close(fd1);
return err;
out_close_1:
sock_release(sock2);
sys_close(fd1);
return err;
out_release_both:
sock_release(sock2);
out_release_1:
sock_release(sock1);
out:
return err;
out_fd2:
put_filp(newfile1);
sock_release(sock1);
out_fd1:
put_filp(newfile2);
sock_release(sock2);
out_fd:
put_unused_fd(fd1);
put_unused_fd(fd2);
goto out;
}
/*
......
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