diff options
Diffstat (limited to 'net/compat.c')
| -rw-r--r-- | net/compat.c | 943 |
1 files changed, 943 insertions, 0 deletions
diff --git a/net/compat.c b/net/compat.c new file mode 100644 index 000000000..2778a236e --- /dev/null +++ b/net/compat.c @@ -0,0 +1,943 @@ +/* + * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. + * + * Copyright (C) 2000 VA Linux Co + * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> + * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 2000 Hewlett-Packard Co. + * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> + * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs + */ + +#include <linux/kernel.h> +#include <linux/gfp.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/file.h> +#include <linux/icmpv6.h> +#include <linux/socket.h> +#include <linux/syscalls.h> +#include <linux/filter.h> +#include <linux/compat.h> +#include <linux/security.h> +#include <linux/audit.h> +#include <linux/export.h> + +#include <net/scm.h> +#include <net/sock.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <linux/uaccess.h> +#include <net/compat.h> + +int get_compat_msghdr(struct msghdr *kmsg, + struct compat_msghdr __user *umsg, + struct sockaddr __user **save_addr, + struct iovec **iov) +{ + struct compat_msghdr msg; + ssize_t err; + + if (copy_from_user(&msg, umsg, sizeof(*umsg))) + return -EFAULT; + + kmsg->msg_flags = msg.msg_flags; + kmsg->msg_namelen = msg.msg_namelen; + + if (!msg.msg_name) + kmsg->msg_namelen = 0; + + if (kmsg->msg_namelen < 0) + return -EINVAL; + + if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) + kmsg->msg_namelen = sizeof(struct sockaddr_storage); + + kmsg->msg_control = compat_ptr(msg.msg_control); + kmsg->msg_controllen = msg.msg_controllen; + + if (save_addr) + *save_addr = compat_ptr(msg.msg_name); + + if (msg.msg_name && kmsg->msg_namelen) { + if (!save_addr) { + err = move_addr_to_kernel(compat_ptr(msg.msg_name), + kmsg->msg_namelen, + kmsg->msg_name); + if (err < 0) + return err; + } + } else { + kmsg->msg_name = NULL; + kmsg->msg_namelen = 0; + } + + if (msg.msg_iovlen > UIO_MAXIOV) + return -EMSGSIZE; + + kmsg->msg_iocb = NULL; + + return compat_import_iovec(save_addr ? READ : WRITE, + compat_ptr(msg.msg_iov), msg.msg_iovlen, + UIO_FASTIOV, iov, &kmsg->msg_iter); +} + +/* Bleech... */ +#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) + +#define CMSG_COMPAT_DATA(cmsg) \ + ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr))) +#define CMSG_COMPAT_SPACE(len) \ + (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len)) +#define CMSG_COMPAT_LEN(len) \ + (sizeof(struct compat_cmsghdr) + (len)) + +#define CMSG_COMPAT_FIRSTHDR(msg) \ + (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ + (struct compat_cmsghdr __user *)((msg)->msg_control) : \ + (struct compat_cmsghdr __user *)NULL) + +#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ + ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ + (ucmlen) <= (unsigned long) \ + ((mhdr)->msg_controllen - \ + ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) + +static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, + struct compat_cmsghdr __user *cmsg, int cmsg_len) +{ + char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); + if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > + msg->msg_controllen) + return NULL; + return (struct compat_cmsghdr __user *)ptr; +} + +/* There is a lot of hair here because the alignment rules (and + * thus placement) of cmsg headers and length are different for + * 32-bit apps. -DaveM + */ +int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, + unsigned char *stackbuf, int stackbuf_size) +{ + struct compat_cmsghdr __user *ucmsg; + struct cmsghdr *kcmsg, *kcmsg_base; + compat_size_t ucmlen; + __kernel_size_t kcmlen, tmp; + int err = -EFAULT; + + BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))); + + kcmlen = 0; + kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; + ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); + while (ucmsg != NULL) { + if (get_user(ucmlen, &ucmsg->cmsg_len)) + return -EFAULT; + + /* Catch bogons. */ + if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) + return -EINVAL; + + tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); + tmp = CMSG_ALIGN(tmp); + kcmlen += tmp; + ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); + } + if (kcmlen == 0) + return -EINVAL; + + /* The kcmlen holds the 64-bit version of the control length. + * It may not be modified as we do not stick it into the kmsg + * until we have successfully copied over all of the data + * from the user. + */ + if (kcmlen > stackbuf_size) + kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); + if (kcmsg == NULL) + return -ENOMEM; + + /* Now copy them over neatly. */ + memset(kcmsg, 0, kcmlen); + ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); + while (ucmsg != NULL) { + if (__get_user(ucmlen, &ucmsg->cmsg_len)) + goto Efault; + if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) + goto Einval; + tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); + if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) + goto Einval; + kcmsg->cmsg_len = tmp; + tmp = CMSG_ALIGN(tmp); + if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || + __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || + copy_from_user(CMSG_DATA(kcmsg), + CMSG_COMPAT_DATA(ucmsg), + (ucmlen - sizeof(*ucmsg)))) + goto Efault; + + /* Advance. */ + kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); + ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); + } + + /* + * check the length of messages copied in is the same as the + * what we get from the first loop + */ + if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) + goto Einval; + + /* Ok, looks like we made it. Hook it up and return success. */ + kmsg->msg_control = kcmsg_base; + kmsg->msg_controllen = kcmlen; + return 0; + +Einval: + err = -EINVAL; +Efault: + if (kcmsg_base != (struct cmsghdr *)stackbuf) + sock_kfree_s(sk, kcmsg_base, kcmlen); + return err; +} + +int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) +{ + struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; + struct compat_cmsghdr cmhdr; + struct compat_timeval ctv; + struct compat_timespec cts[3]; + int cmlen; + + if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { + kmsg->msg_flags |= MSG_CTRUNC; + return 0; /* XXX: return error? check spec. */ + } + + if (!COMPAT_USE_64BIT_TIME) { + if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { + struct timeval *tv = (struct timeval *)data; + ctv.tv_sec = tv->tv_sec; + ctv.tv_usec = tv->tv_usec; + data = &ctv; + len = sizeof(ctv); + } + if (level == SOL_SOCKET && + (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) { + int count = type == SCM_TIMESTAMPNS ? 1 : 3; + int i; + struct timespec *ts = (struct timespec *)data; + for (i = 0; i < count; i++) { + cts[i].tv_sec = ts[i].tv_sec; + cts[i].tv_nsec = ts[i].tv_nsec; + } + data = &cts; + len = sizeof(cts[0]) * count; + } + } + + cmlen = CMSG_COMPAT_LEN(len); + if (kmsg->msg_controllen < cmlen) { + kmsg->msg_flags |= MSG_CTRUNC; + cmlen = kmsg->msg_controllen; + } + cmhdr.cmsg_level = level; + cmhdr.cmsg_type = type; + cmhdr.cmsg_len = cmlen; + + if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) + return -EFAULT; + if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) + return -EFAULT; + cmlen = CMSG_COMPAT_SPACE(len); + if (kmsg->msg_controllen < cmlen) + cmlen = kmsg->msg_controllen; + kmsg->msg_control += cmlen; + kmsg->msg_controllen -= cmlen; + return 0; +} + +void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) +{ + struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; + int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); + int fdnum = scm->fp->count; + struct file **fp = scm->fp->fp; + int __user *cmfptr; + int err = 0, i; + + if (fdnum < fdmax) + fdmax = fdnum; + + for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { + int new_fd; + err = security_file_receive(fp[i]); + if (err) + break; + err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags + ? O_CLOEXEC : 0); + if (err < 0) + break; + new_fd = err; + err = put_user(new_fd, cmfptr); + if (err) { + put_unused_fd(new_fd); + break; + } + /* Bump the usage count and install the file. */ + __receive_sock(fp[i]); + fd_install(new_fd, get_file(fp[i])); + } + + if (i > 0) { + int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); + err = put_user(SOL_SOCKET, &cm->cmsg_level); + if (!err) + err = put_user(SCM_RIGHTS, &cm->cmsg_type); + if (!err) + err = put_user(cmlen, &cm->cmsg_len); + if (!err) { + cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); + kmsg->msg_control += cmlen; + kmsg->msg_controllen -= cmlen; + } + } + if (i < fdnum) + kmsg->msg_flags |= MSG_CTRUNC; + + /* + * All of the files that fit in the message have had their + * usage counts incremented, so we just free the list. + */ + __scm_destroy(scm); +} + +/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ +struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) +{ + struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; + struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); + struct compat_sock_fprog f32; + struct sock_fprog f; + + if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) + return NULL; + memset(&f, 0, sizeof(f)); + f.len = f32.len; + f.filter = compat_ptr(f32.filter); + if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) + return NULL; + + return kfprog; +} +EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); + +static int do_set_attach_filter(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct sock_fprog __user *kfprog; + + kfprog = get_compat_bpf_fprog(optval); + if (!kfprog) + return -EFAULT; + + return sock_setsockopt(sock, level, optname, (char __user *)kfprog, + sizeof(struct sock_fprog)); +} + +static int do_set_sock_timeout(struct socket *sock, int level, + int optname, char __user *optval, unsigned int optlen) +{ + struct compat_timeval __user *up = (struct compat_timeval __user *)optval; + struct timeval ktime; + mm_segment_t old_fs; + int err; + + if (optlen < sizeof(*up)) + return -EINVAL; + if (!access_ok(VERIFY_READ, up, sizeof(*up)) || + __get_user(ktime.tv_sec, &up->tv_sec) || + __get_user(ktime.tv_usec, &up->tv_usec)) + return -EFAULT; + old_fs = get_fs(); + set_fs(KERNEL_DS); + err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime)); + set_fs(old_fs); + + return err; +} + +static int compat_sock_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned int optlen) +{ + if (optname == SO_ATTACH_FILTER || + optname == SO_ATTACH_REUSEPORT_CBPF) + return do_set_attach_filter(sock, level, optname, + optval, optlen); + if (!COMPAT_USE_64BIT_TIME && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) + return do_set_sock_timeout(sock, level, optname, optval, optlen); + + return sock_setsockopt(sock, level, optname, optval, optlen); +} + +static int __compat_sys_setsockopt(int fd, int level, int optname, + char __user *optval, unsigned int optlen) +{ + int err; + struct socket *sock = sockfd_lookup(fd, &err); + + if (sock) { + err = security_socket_setsockopt(sock, level, optname); + if (err) { + sockfd_put(sock); + return err; + } + + if (level == SOL_SOCKET) + err = compat_sock_setsockopt(sock, level, + optname, optval, optlen); + else if (sock->ops->compat_setsockopt) + err = sock->ops->compat_setsockopt(sock, level, + optname, optval, optlen); + else + err = sock->ops->setsockopt(sock, level, + optname, optval, optlen); + sockfd_put(sock); + } + return err; +} + +COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, + char __user *, optval, unsigned int, optlen) +{ + return __compat_sys_setsockopt(fd, level, optname, optval, optlen); +} + +static int do_get_sock_timeout(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct compat_timeval __user *up; + struct timeval ktime; + mm_segment_t old_fs; + int len, err; + + up = (struct compat_timeval __user *) optval; + if (get_user(len, optlen)) + return -EFAULT; + if (len < sizeof(*up)) + return -EINVAL; + len = sizeof(ktime); + old_fs = get_fs(); + set_fs(KERNEL_DS); + err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); + set_fs(old_fs); + + if (!err) { + if (put_user(sizeof(*up), optlen) || + !access_ok(VERIFY_WRITE, up, sizeof(*up)) || + __put_user(ktime.tv_sec, &up->tv_sec) || + __put_user(ktime.tv_usec, &up->tv_usec)) + err = -EFAULT; + } + return err; +} + +static int compat_sock_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + if (!COMPAT_USE_64BIT_TIME && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) + return do_get_sock_timeout(sock, level, optname, optval, optlen); + return sock_getsockopt(sock, level, optname, optval, optlen); +} + +int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) +{ + struct compat_timeval __user *ctv; + int err; + struct timeval tv; + + if (COMPAT_USE_64BIT_TIME) + return sock_get_timestamp(sk, userstamp); + + ctv = (struct compat_timeval __user *) userstamp; + err = -ENOENT; + sock_enable_timestamp(sk, SOCK_TIMESTAMP); + tv = ktime_to_timeval(sock_read_timestamp(sk)); + + if (tv.tv_sec == -1) + return err; + if (tv.tv_sec == 0) { + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); + tv = ktime_to_timeval(kt); + } + err = 0; + if (put_user(tv.tv_sec, &ctv->tv_sec) || + put_user(tv.tv_usec, &ctv->tv_usec)) + err = -EFAULT; + return err; +} +EXPORT_SYMBOL(compat_sock_get_timestamp); + +int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) +{ + struct compat_timespec __user *ctv; + int err; + struct timespec ts; + + if (COMPAT_USE_64BIT_TIME) + return sock_get_timestampns (sk, userstamp); + + ctv = (struct compat_timespec __user *) userstamp; + err = -ENOENT; + sock_enable_timestamp(sk, SOCK_TIMESTAMP); + ts = ktime_to_timespec(sock_read_timestamp(sk)); + if (ts.tv_sec == -1) + return err; + if (ts.tv_sec == 0) { + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); + ts = ktime_to_timespec(kt); + } + err = 0; + if (put_user(ts.tv_sec, &ctv->tv_sec) || + put_user(ts.tv_nsec, &ctv->tv_nsec)) + err = -EFAULT; + return err; +} +EXPORT_SYMBOL(compat_sock_get_timestampns); + +static int __compat_sys_getsockopt(int fd, int level, int optname, + char __user *optval, + int __user *optlen) +{ + int err; + struct socket *sock = sockfd_lookup(fd, &err); + + if (sock) { + err = security_socket_getsockopt(sock, level, optname); + if (err) { + sockfd_put(sock); + return err; + } + + if (level == SOL_SOCKET) + err = compat_sock_getsockopt(sock, level, + optname, optval, optlen); + else if (sock->ops->compat_getsockopt) + err = sock->ops->compat_getsockopt(sock, level, + optname, optval, optlen); + else + err = sock->ops->getsockopt(sock, level, + optname, optval, optlen); + sockfd_put(sock); + } + return err; +} + +COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, + char __user *, optval, int __user *, optlen) +{ + return __compat_sys_getsockopt(fd, level, optname, optval, optlen); +} + +struct compat_group_req { + __u32 gr_interface; + struct __kernel_sockaddr_storage gr_group + __aligned(4); +} __packed; + +struct compat_group_source_req { + __u32 gsr_interface; + struct __kernel_sockaddr_storage gsr_group + __aligned(4); + struct __kernel_sockaddr_storage gsr_source + __aligned(4); +} __packed; + +struct compat_group_filter { + __u32 gf_interface; + struct __kernel_sockaddr_storage gf_group + __aligned(4); + __u32 gf_fmode; + __u32 gf_numsrc; + struct __kernel_sockaddr_storage gf_slist[1] + __aligned(4); +} __packed; + +#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ + sizeof(struct __kernel_sockaddr_storage)) + + +int compat_mc_setsockopt(struct sock *sock, int level, int optname, + char __user *optval, unsigned int optlen, + int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int)) +{ + char __user *koptval = optval; + int koptlen = optlen; + + switch (optname) { + case MCAST_JOIN_GROUP: + case MCAST_LEAVE_GROUP: + { + struct compat_group_req __user *gr32 = (void *)optval; + struct group_req __user *kgr = + compat_alloc_user_space(sizeof(struct group_req)); + u32 interface; + + if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) || + !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) || + __get_user(interface, &gr32->gr_interface) || + __put_user(interface, &kgr->gr_interface) || + copy_in_user(&kgr->gr_group, &gr32->gr_group, + sizeof(kgr->gr_group))) + return -EFAULT; + koptval = (char __user *)kgr; + koptlen = sizeof(struct group_req); + break; + } + case MCAST_JOIN_SOURCE_GROUP: + case MCAST_LEAVE_SOURCE_GROUP: + case MCAST_BLOCK_SOURCE: + case MCAST_UNBLOCK_SOURCE: + { + struct compat_group_source_req __user *gsr32 = (void *)optval; + struct group_source_req __user *kgsr = compat_alloc_user_space( + sizeof(struct group_source_req)); + u32 interface; + + if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) || + !access_ok(VERIFY_WRITE, kgsr, + sizeof(struct group_source_req)) || + __get_user(interface, &gsr32->gsr_interface) || + __put_user(interface, &kgsr->gsr_interface) || + copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group, + sizeof(kgsr->gsr_group)) || + copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source, + sizeof(kgsr->gsr_source))) + return -EFAULT; + koptval = (char __user *)kgsr; + koptlen = sizeof(struct group_source_req); + break; + } + case MCAST_MSFILTER: + { + struct compat_group_filter __user *gf32 = (void *)optval; + struct group_filter __user *kgf; + u32 interface, fmode, numsrc; + + if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || + __get_user(interface, &gf32->gf_interface) || + __get_user(fmode, &gf32->gf_fmode) || + __get_user(numsrc, &gf32->gf_numsrc)) + return -EFAULT; + koptlen = optlen + sizeof(struct group_filter) - + sizeof(struct compat_group_filter); + if (koptlen < GROUP_FILTER_SIZE(numsrc)) + return -EINVAL; + kgf = compat_alloc_user_space(koptlen); + if (!access_ok(VERIFY_WRITE, kgf, koptlen) || + __put_user(interface, &kgf->gf_interface) || + __put_user(fmode, &kgf->gf_fmode) || + __put_user(numsrc, &kgf->gf_numsrc) || + copy_in_user(&kgf->gf_group, &gf32->gf_group, + sizeof(kgf->gf_group)) || + (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, + numsrc * sizeof(kgf->gf_slist[0])))) + return -EFAULT; + koptval = (char __user *)kgf; + break; + } + + default: + break; + } + return setsockopt(sock, level, optname, koptval, koptlen); +} +EXPORT_SYMBOL(compat_mc_setsockopt); + +int compat_mc_getsockopt(struct sock *sock, int level, int optname, + char __user *optval, int __user *optlen, + int (*getsockopt)(struct sock *, int, int, char __user *, int __user *)) +{ + struct compat_group_filter __user *gf32 = (void *)optval; + struct group_filter __user *kgf; + int __user *koptlen; + u32 interface, fmode, numsrc; + int klen, ulen, err; + + if (optname != MCAST_MSFILTER) + return getsockopt(sock, level, optname, optval, optlen); + + koptlen = compat_alloc_user_space(sizeof(*koptlen)); + if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) || + __get_user(ulen, optlen)) + return -EFAULT; + + /* adjust len for pad */ + klen = ulen + sizeof(*kgf) - sizeof(*gf32); + + if (klen < GROUP_FILTER_SIZE(0)) + return -EINVAL; + + if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) || + __put_user(klen, koptlen)) + return -EFAULT; + + /* have to allow space for previous compat_alloc_user_space, too */ + kgf = compat_alloc_user_space(klen+sizeof(*optlen)); + + if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || + __get_user(interface, &gf32->gf_interface) || + __get_user(fmode, &gf32->gf_fmode) || + __get_user(numsrc, &gf32->gf_numsrc) || + __put_user(interface, &kgf->gf_interface) || + __put_user(fmode, &kgf->gf_fmode) || + __put_user(numsrc, &kgf->gf_numsrc) || + copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group))) + return -EFAULT; + + err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen); + if (err) + return err; + + if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) || + __get_user(klen, koptlen)) + return -EFAULT; + + ulen = klen - (sizeof(*kgf)-sizeof(*gf32)); + + if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) || + __put_user(ulen, optlen)) + return -EFAULT; + + if (!access_ok(VERIFY_READ, kgf, klen) || + !access_ok(VERIFY_WRITE, gf32, ulen) || + __get_user(interface, &kgf->gf_interface) || + __get_user(fmode, &kgf->gf_fmode) || + __get_user(numsrc, &kgf->gf_numsrc) || + __put_user(interface, &gf32->gf_interface) || + __put_user(fmode, &gf32->gf_fmode) || + __put_user(numsrc, &gf32->gf_numsrc)) + return -EFAULT; + if (numsrc) { + int copylen; + + klen -= GROUP_FILTER_SIZE(0); + copylen = numsrc * sizeof(gf32->gf_slist[0]); + if (copylen > klen) + copylen = klen; + if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen)) + return -EFAULT; + } + return err; +} +EXPORT_SYMBOL(compat_mc_getsockopt); + + +/* Argument list sizes for compat_sys_socketcall */ +#define AL(x) ((x) * sizeof(u32)) +static unsigned char nas[21] = { + AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), + AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), + AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), + AL(4), AL(5), AL(4) +}; +#undef AL + +static inline long __compat_sys_sendmsg(int fd, + struct compat_msghdr __user *msg, + unsigned int flags) +{ + return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, + flags | MSG_CMSG_COMPAT, false); +} + +COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, + unsigned int, flags) +{ + return __compat_sys_sendmsg(fd, msg, flags); +} + +static inline long __compat_sys_sendmmsg(int fd, + struct compat_mmsghdr __user *mmsg, + unsigned int vlen, unsigned int flags) +{ + return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, + flags | MSG_CMSG_COMPAT, false); +} + +COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, + unsigned int, vlen, unsigned int, flags) +{ + return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); +} + +static inline long __compat_sys_recvmsg(int fd, + struct compat_msghdr __user *msg, + unsigned int flags) +{ + return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, + flags | MSG_CMSG_COMPAT, false); +} + +COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, + unsigned int, flags) +{ + return __compat_sys_recvmsg(fd, msg, flags); +} + +static inline long __compat_sys_recvfrom(int fd, void __user *buf, + compat_size_t len, unsigned int flags, + struct sockaddr __user *addr, + int __user *addrlen) +{ + return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, + addrlen); +} + +COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags) +{ + return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL); +} + +COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, + unsigned int, flags, struct sockaddr __user *, addr, + int __user *, addrlen) +{ + return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen); +} + +static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, + unsigned int vlen, unsigned int flags, + struct compat_timespec __user *timeout) +{ + int datagrams; + struct timespec ktspec; + + if (timeout == NULL) + return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, + flags | MSG_CMSG_COMPAT, NULL); + + if (compat_get_timespec(&ktspec, timeout)) + return -EFAULT; + + datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, + flags | MSG_CMSG_COMPAT, &ktspec); + if (datagrams > 0 && compat_put_timespec(&ktspec, timeout)) + datagrams = -EFAULT; + + return datagrams; +} + +COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, + unsigned int, vlen, unsigned int, flags, + struct compat_timespec __user *, timeout) +{ + return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout); +} + +COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) +{ + u32 a[AUDITSC_ARGS]; + unsigned int len; + u32 a0, a1; + int ret; + + if (call < SYS_SOCKET || call > SYS_SENDMMSG) + return -EINVAL; + len = nas[call]; + if (len > sizeof(a)) + return -EINVAL; + + if (copy_from_user(a, args, len)) + return -EFAULT; + + ret = audit_socketcall_compat(len / sizeof(a[0]), a); + if (ret) + return ret; + + a0 = a[0]; + a1 = a[1]; + + switch (call) { + case SYS_SOCKET: + ret = __sys_socket(a0, a1, a[2]); + break; + case SYS_BIND: + ret = __sys_bind(a0, compat_ptr(a1), a[2]); + break; + case SYS_CONNECT: + ret = __sys_connect(a0, compat_ptr(a1), a[2]); + break; + case SYS_LISTEN: + ret = __sys_listen(a0, a1); + break; + case SYS_ACCEPT: + ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); + break; + case SYS_GETSOCKNAME: + ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); + break; + case SYS_GETPEERNAME: + ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); + break; + case SYS_SOCKETPAIR: + ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); + break; + case SYS_SEND: + ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); + break; + case SYS_SENDTO: + ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], + compat_ptr(a[4]), a[5]); + break; + case SYS_RECV: + ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], + NULL, NULL); + break; + case SYS_RECVFROM: + ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], + compat_ptr(a[4]), + compat_ptr(a[5])); + break; + case SYS_SHUTDOWN: + ret = __sys_shutdown(a0, a1); + break; + case SYS_SETSOCKOPT: + ret = __compat_sys_setsockopt(a0, a1, a[2], + compat_ptr(a[3]), a[4]); + break; + case SYS_GETSOCKOPT: + ret = __compat_sys_getsockopt(a0, a1, a[2], + compat_ptr(a[3]), + compat_ptr(a[4])); + break; + case SYS_SENDMSG: + ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); + break; + case SYS_SENDMMSG: + ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); + break; + case SYS_RECVMSG: + ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); + break; + case SYS_RECVMMSG: + ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], + compat_ptr(a[4])); + break; + case SYS_ACCEPT4: + ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} |