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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/compat.c | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/compat.c')
-rw-r--r-- | net/compat.c | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/net/compat.c b/net/compat.c new file mode 100644 index 000000000000..be5d936dc423 --- /dev/null +++ b/net/compat.c @@ -0,0 +1,605 @@ +/* + * 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/fs.h> +#include <linux/sched.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/netfilter_ipv4/ip_tables.h> +#include <linux/security.h> + +#include <net/scm.h> +#include <net/sock.h> +#include <asm/uaccess.h> +#include <net/compat.h> + +static inline int iov_from_user_compat_to_kern(struct iovec *kiov, + struct compat_iovec __user *uiov32, + int niov) +{ + int tot_len = 0; + + while(niov > 0) { + compat_uptr_t buf; + compat_size_t len; + + if(get_user(len, &uiov32->iov_len) || + get_user(buf, &uiov32->iov_base)) { + tot_len = -EFAULT; + break; + } + tot_len += len; + kiov->iov_base = compat_ptr(buf); + kiov->iov_len = (__kernel_size_t) len; + uiov32++; + kiov++; + niov--; + } + return tot_len; +} + +int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) +{ + compat_uptr_t tmp1, tmp2, tmp3; + + if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || + __get_user(tmp1, &umsg->msg_name) || + __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || + __get_user(tmp2, &umsg->msg_iov) || + __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || + __get_user(tmp3, &umsg->msg_control) || + __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || + __get_user(kmsg->msg_flags, &umsg->msg_flags)) + return -EFAULT; + kmsg->msg_name = compat_ptr(tmp1); + kmsg->msg_iov = compat_ptr(tmp2); + kmsg->msg_control = compat_ptr(tmp3); + return 0; +} + +/* I've named the args so it is easy to tell whose space the pointers are in. */ +int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, + char *kern_address, int mode) +{ + int tot_len; + + if(kern_msg->msg_namelen) { + if(mode==VERIFY_READ) { + int err = move_addr_to_kernel(kern_msg->msg_name, + kern_msg->msg_namelen, + kern_address); + if(err < 0) + return err; + } + kern_msg->msg_name = kern_address; + } else + kern_msg->msg_name = NULL; + + if(kern_msg->msg_iovlen > UIO_FASTIOV) { + kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec), + GFP_KERNEL); + if(!kern_iov) + return -ENOMEM; + } + + tot_len = iov_from_user_compat_to_kern(kern_iov, + (struct compat_iovec __user *)kern_msg->msg_iov, + kern_msg->msg_iovlen); + if(tot_len >= 0) + kern_msg->msg_iov = kern_iov; + else if(kern_msg->msg_iovlen > UIO_FASTIOV) + kfree(kern_iov); + + return tot_len; +} + +/* Bleech... */ +#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) + +#define CMSG_COMPAT_DATA(cmsg) \ + ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) +#define CMSG_COMPAT_SPACE(len) \ + (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) +#define CMSG_COMPAT_LEN(len) \ + (CMSG_COMPAT_ALIGN(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, + 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; + + 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 - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + + CMSG_ALIGN(sizeof(struct cmsghdr))); + 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 = kmalloc(kcmlen, GFP_KERNEL); + if(kcmsg == NULL) + return -ENOBUFS; + + /* Now copy them over neatly. */ + memset(kcmsg, 0, kcmlen); + ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); + while(ucmsg != NULL) { + __get_user(ucmlen, &ucmsg->cmsg_len); + tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + + CMSG_ALIGN(sizeof(struct cmsghdr))); + kcmsg->cmsg_len = tmp; + __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level); + __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type); + + /* Copy over the data. */ + if(copy_from_user(CMSG_DATA(kcmsg), + CMSG_COMPAT_DATA(ucmsg), + (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) + goto out_free_efault; + + /* Advance. */ + kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp)); + ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); + } + + /* Ok, looks like we made it. Hook it up and return success. */ + kmsg->msg_control = kcmsg_base; + kmsg->msg_controllen = kcmlen; + return 0; + +out_free_efault: + if(kcmsg_base != (struct cmsghdr *)stackbuf) + kfree(kcmsg_base); + return -EFAULT; +} + +int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) +{ + struct compat_timeval ctv; + struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; + struct compat_cmsghdr cmhdr; + int cmlen; + + if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { + kmsg->msg_flags |= MSG_CTRUNC; + return 0; /* XXX: return error? check spec. */ + } + + if (level == SOL_SOCKET && type == SO_TIMESTAMP) { + struct timeval *tv = (struct timeval *)data; + ctv.tv_sec = tv->tv_sec; + ctv.tv_usec = tv->tv_usec; + data = &ctv; + len = sizeof(struct compat_timeval); + } + + 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); + 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(); + 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. */ + get_file(fp[i]); + fd_install(new_fd, fp[i]); + } + + if (i > 0) { + int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); + if (!err) + 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); +} + +/* + * For now, we assume that the compatibility and native version + * of struct ipt_entry are the same - sfr. FIXME + */ +struct compat_ipt_replace { + char name[IPT_TABLE_MAXNAMELEN]; + u32 valid_hooks; + u32 num_entries; + u32 size; + u32 hook_entry[NF_IP_NUMHOOKS]; + u32 underflow[NF_IP_NUMHOOKS]; + u32 num_counters; + compat_uptr_t counters; /* struct ipt_counters * */ + struct ipt_entry entries[0]; +}; + +static int do_netfilter_replace(int fd, int level, int optname, + char __user *optval, int optlen) +{ + struct compat_ipt_replace __user *urepl; + struct ipt_replace __user *repl_nat; + char name[IPT_TABLE_MAXNAMELEN]; + u32 origsize, tmp32, num_counters; + unsigned int repl_nat_size; + int ret; + int i; + compat_uptr_t ucntrs; + + urepl = (struct compat_ipt_replace __user *)optval; + if (get_user(origsize, &urepl->size)) + return -EFAULT; + + /* Hack: Causes ipchains to give correct error msg --RR */ + if (optlen != sizeof(*urepl) + origsize) + return -ENOPROTOOPT; + + /* XXX Assumes that size of ipt_entry is the same both in + * native and compat environments. + */ + repl_nat_size = sizeof(*repl_nat) + origsize; + repl_nat = compat_alloc_user_space(repl_nat_size); + + ret = -EFAULT; + if (put_user(origsize, &repl_nat->size)) + goto out; + + if (!access_ok(VERIFY_READ, urepl, optlen) || + !access_ok(VERIFY_WRITE, repl_nat, optlen)) + goto out; + + if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) || + __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name))) + goto out; + + if (__get_user(tmp32, &urepl->valid_hooks) || + __put_user(tmp32, &repl_nat->valid_hooks)) + goto out; + + if (__get_user(tmp32, &urepl->num_entries) || + __put_user(tmp32, &repl_nat->num_entries)) + goto out; + + if (__get_user(num_counters, &urepl->num_counters) || + __put_user(num_counters, &repl_nat->num_counters)) + goto out; + + if (__get_user(ucntrs, &urepl->counters) || + __put_user(compat_ptr(ucntrs), &repl_nat->counters)) + goto out; + + if (__copy_in_user(&repl_nat->entries[0], + &urepl->entries[0], + origsize)) + goto out; + + for (i = 0; i < NF_IP_NUMHOOKS; i++) { + if (__get_user(tmp32, &urepl->hook_entry[i]) || + __put_user(tmp32, &repl_nat->hook_entry[i]) || + __get_user(tmp32, &urepl->underflow[i]) || + __put_user(tmp32, &repl_nat->underflow[i])) + goto out; + } + + /* + * Since struct ipt_counters just contains two u_int64_t members + * we can just do the access_ok check here and pass the (converted) + * pointer into the standard syscall. We hope that the pointer is + * not misaligned ... + */ + if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs), + num_counters * sizeof(struct ipt_counters))) + goto out; + + + ret = sys_setsockopt(fd, level, optname, + (char __user *)repl_nat, repl_nat_size); + +out: + return ret; +} + +/* + * A struct sock_filter is architecture independent. + */ +struct compat_sock_fprog { + u16 len; + compat_uptr_t filter; /* struct sock_filter * */ +}; + +static int do_set_attach_filter(int fd, int level, int optname, + char __user *optval, int optlen) +{ + 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)); + compat_uptr_t ptr; + u16 len; + + if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || + !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || + __get_user(len, &fprog32->len) || + __get_user(ptr, &fprog32->filter) || + __put_user(len, &kfprog->len) || + __put_user(compat_ptr(ptr), &kfprog->filter)) + return -EFAULT; + + return sys_setsockopt(fd, level, optname, (char __user *)kfprog, + sizeof(struct sock_fprog)); +} + +static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, 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 = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime)); + set_fs(old_fs); + + return err; +} + +asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, + char __user *optval, int optlen) +{ + /* SO_SET_REPLACE seems to be the same in all levels */ + if (optname == IPT_SO_SET_REPLACE) + return do_netfilter_replace(fd, level, optname, + optval, optlen); + if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER) + return do_set_attach_filter(fd, level, optname, + optval, optlen); + if (level == SOL_SOCKET && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) + return do_set_sock_timeout(fd, level, optname, optval, optlen); + + return sys_setsockopt(fd, level, optname, optval, optlen); +} + +static int do_get_sock_timeout(int fd, 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 = sys_getsockopt(fd, 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; +} + +asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, + char __user *optval, int __user *optlen) +{ + if (level == SOL_SOCKET && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) + return do_get_sock_timeout(fd, level, optname, optval, optlen); + return sys_getsockopt(fd, level, optname, optval, optlen); +} + +/* Argument list sizes for compat_sys_socketcall */ +#define AL(x) ((x) * sizeof(u32)) +static unsigned char nas[18]={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)}; +#undef AL + +asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) +{ + return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); +} + +asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) +{ + return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); +} + +asmlinkage long compat_sys_socketcall(int call, u32 __user *args) +{ + int ret; + u32 a[6]; + u32 a0, a1; + + if (call < SYS_SOCKET || call > SYS_RECVMSG) + return -EINVAL; + if (copy_from_user(a, args, nas[call])) + return -EFAULT; + 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_accept(a0, compat_ptr(a1), compat_ptr(a[2])); + 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_send(a0, compat_ptr(a1), a[2], a[3]); + 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 = sys_recv(a0, compat_ptr(a1), a[2], a[3]); + break; + case SYS_RECVFROM: + ret = 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_RECVMSG: + ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} |