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8920e8f94c
When we copy 32bit ->msg_control contents to kernel, we walk the same userland data twice without sanity checks on the second pass. Second version of this patch: the original broke with 64-bit arches running 32-bit-compat-mode executables doing sendmsg() syscalls with unaligned CMSG data areas Another thing is that we use kmalloc() to allocate and sock_kfree_s() to free afterwards; less serious, but also needs fixing. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
605 lines
17 KiB
C
605 lines
17 KiB
C
/*
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* 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
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*
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* Copyright (C) 2000 VA Linux Co
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* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
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* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 2000 Hewlett-Packard Co.
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* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/file.h>
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#include <linux/icmpv6.h>
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#include <linux/socket.h>
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#include <linux/syscalls.h>
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#include <linux/filter.h>
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#include <linux/compat.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/security.h>
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#include <net/scm.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <net/compat.h>
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static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
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struct compat_iovec __user *uiov32,
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int niov)
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{
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int tot_len = 0;
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while(niov > 0) {
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compat_uptr_t buf;
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compat_size_t len;
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if(get_user(len, &uiov32->iov_len) ||
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get_user(buf, &uiov32->iov_base)) {
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tot_len = -EFAULT;
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break;
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}
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tot_len += len;
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kiov->iov_base = compat_ptr(buf);
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kiov->iov_len = (__kernel_size_t) len;
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uiov32++;
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kiov++;
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niov--;
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}
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return tot_len;
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}
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int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
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{
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compat_uptr_t tmp1, tmp2, tmp3;
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if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
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__get_user(tmp1, &umsg->msg_name) ||
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__get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
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__get_user(tmp2, &umsg->msg_iov) ||
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__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
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__get_user(tmp3, &umsg->msg_control) ||
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__get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
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__get_user(kmsg->msg_flags, &umsg->msg_flags))
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return -EFAULT;
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kmsg->msg_name = compat_ptr(tmp1);
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kmsg->msg_iov = compat_ptr(tmp2);
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kmsg->msg_control = compat_ptr(tmp3);
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return 0;
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}
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/* I've named the args so it is easy to tell whose space the pointers are in. */
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int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
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char *kern_address, int mode)
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{
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int tot_len;
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if(kern_msg->msg_namelen) {
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if(mode==VERIFY_READ) {
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int err = move_addr_to_kernel(kern_msg->msg_name,
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kern_msg->msg_namelen,
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kern_address);
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if(err < 0)
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return err;
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}
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kern_msg->msg_name = kern_address;
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} else
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kern_msg->msg_name = NULL;
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tot_len = iov_from_user_compat_to_kern(kern_iov,
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(struct compat_iovec __user *)kern_msg->msg_iov,
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kern_msg->msg_iovlen);
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if(tot_len >= 0)
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kern_msg->msg_iov = kern_iov;
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return tot_len;
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}
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/* Bleech... */
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#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
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#define CMSG_COMPAT_DATA(cmsg) \
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((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
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#define CMSG_COMPAT_SPACE(len) \
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(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
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#define CMSG_COMPAT_LEN(len) \
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(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
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#define CMSG_COMPAT_FIRSTHDR(msg) \
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(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
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(struct compat_cmsghdr __user *)((msg)->msg_control) : \
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(struct compat_cmsghdr __user *)NULL)
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#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
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((ucmlen) >= sizeof(struct compat_cmsghdr) && \
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(ucmlen) <= (unsigned long) \
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((mhdr)->msg_controllen - \
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((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
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static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
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struct compat_cmsghdr __user *cmsg, int cmsg_len)
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{
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char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
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if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
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msg->msg_controllen)
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return NULL;
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return (struct compat_cmsghdr __user *)ptr;
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}
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/* There is a lot of hair here because the alignment rules (and
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* thus placement) of cmsg headers and length are different for
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* 32-bit apps. -DaveM
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*/
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int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
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unsigned char *stackbuf, int stackbuf_size)
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{
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struct compat_cmsghdr __user *ucmsg;
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struct cmsghdr *kcmsg, *kcmsg_base;
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compat_size_t ucmlen;
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__kernel_size_t kcmlen, tmp;
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int err = -EFAULT;
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kcmlen = 0;
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kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
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ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
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while(ucmsg != NULL) {
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if(get_user(ucmlen, &ucmsg->cmsg_len))
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return -EFAULT;
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/* Catch bogons. */
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if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
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return -EINVAL;
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tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
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CMSG_ALIGN(sizeof(struct cmsghdr)));
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tmp = CMSG_ALIGN(tmp);
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kcmlen += tmp;
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ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
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}
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if(kcmlen == 0)
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return -EINVAL;
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/* The kcmlen holds the 64-bit version of the control length.
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* It may not be modified as we do not stick it into the kmsg
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* until we have successfully copied over all of the data
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* from the user.
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*/
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if (kcmlen > stackbuf_size)
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kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
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if (kcmsg == NULL)
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return -ENOBUFS;
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/* Now copy them over neatly. */
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memset(kcmsg, 0, kcmlen);
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ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
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while(ucmsg != NULL) {
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if (__get_user(ucmlen, &ucmsg->cmsg_len))
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goto Efault;
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if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
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goto Einval;
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tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
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CMSG_ALIGN(sizeof(struct cmsghdr)));
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if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
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goto Einval;
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kcmsg->cmsg_len = tmp;
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tmp = CMSG_ALIGN(tmp);
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if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
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__get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
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copy_from_user(CMSG_DATA(kcmsg),
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CMSG_COMPAT_DATA(ucmsg),
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(ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
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goto Efault;
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/* Advance. */
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kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
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ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
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}
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/* Ok, looks like we made it. Hook it up and return success. */
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kmsg->msg_control = kcmsg_base;
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kmsg->msg_controllen = kcmlen;
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return 0;
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Einval:
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err = -EINVAL;
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Efault:
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if (kcmsg_base != (struct cmsghdr *)stackbuf)
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sock_kfree_s(sk, kcmsg_base, kcmlen);
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return err;
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}
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int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
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{
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struct compat_timeval ctv;
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struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
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struct compat_cmsghdr cmhdr;
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int cmlen;
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if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
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kmsg->msg_flags |= MSG_CTRUNC;
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return 0; /* XXX: return error? check spec. */
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}
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if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
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struct timeval *tv = (struct timeval *)data;
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ctv.tv_sec = tv->tv_sec;
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ctv.tv_usec = tv->tv_usec;
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data = &ctv;
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len = sizeof(struct compat_timeval);
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}
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cmlen = CMSG_COMPAT_LEN(len);
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if(kmsg->msg_controllen < cmlen) {
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kmsg->msg_flags |= MSG_CTRUNC;
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cmlen = kmsg->msg_controllen;
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}
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cmhdr.cmsg_level = level;
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cmhdr.cmsg_type = type;
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cmhdr.cmsg_len = cmlen;
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if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
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return -EFAULT;
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if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
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return -EFAULT;
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cmlen = CMSG_COMPAT_SPACE(len);
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kmsg->msg_control += cmlen;
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kmsg->msg_controllen -= cmlen;
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return 0;
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}
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void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
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{
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struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
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int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
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int fdnum = scm->fp->count;
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struct file **fp = scm->fp->fp;
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int __user *cmfptr;
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int err = 0, i;
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if (fdnum < fdmax)
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fdmax = fdnum;
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for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
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int new_fd;
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err = security_file_receive(fp[i]);
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if (err)
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break;
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err = get_unused_fd();
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if (err < 0)
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break;
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new_fd = err;
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err = put_user(new_fd, cmfptr);
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if (err) {
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put_unused_fd(new_fd);
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break;
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}
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/* Bump the usage count and install the file. */
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get_file(fp[i]);
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fd_install(new_fd, fp[i]);
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}
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if (i > 0) {
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int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
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if (!err)
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err = put_user(SOL_SOCKET, &cm->cmsg_level);
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if (!err)
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err = put_user(SCM_RIGHTS, &cm->cmsg_type);
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if (!err)
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err = put_user(cmlen, &cm->cmsg_len);
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if (!err) {
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cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
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kmsg->msg_control += cmlen;
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kmsg->msg_controllen -= cmlen;
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}
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}
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if (i < fdnum)
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kmsg->msg_flags |= MSG_CTRUNC;
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/*
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* All of the files that fit in the message have had their
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* usage counts incremented, so we just free the list.
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*/
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__scm_destroy(scm);
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}
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/*
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* For now, we assume that the compatibility and native version
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* of struct ipt_entry are the same - sfr. FIXME
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*/
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struct compat_ipt_replace {
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char name[IPT_TABLE_MAXNAMELEN];
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u32 valid_hooks;
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u32 num_entries;
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u32 size;
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u32 hook_entry[NF_IP_NUMHOOKS];
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u32 underflow[NF_IP_NUMHOOKS];
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u32 num_counters;
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compat_uptr_t counters; /* struct ipt_counters * */
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struct ipt_entry entries[0];
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};
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static int do_netfilter_replace(int fd, int level, int optname,
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char __user *optval, int optlen)
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{
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struct compat_ipt_replace __user *urepl;
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struct ipt_replace __user *repl_nat;
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char name[IPT_TABLE_MAXNAMELEN];
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u32 origsize, tmp32, num_counters;
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unsigned int repl_nat_size;
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int ret;
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int i;
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compat_uptr_t ucntrs;
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urepl = (struct compat_ipt_replace __user *)optval;
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if (get_user(origsize, &urepl->size))
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return -EFAULT;
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/* Hack: Causes ipchains to give correct error msg --RR */
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if (optlen != sizeof(*urepl) + origsize)
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return -ENOPROTOOPT;
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/* XXX Assumes that size of ipt_entry is the same both in
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* native and compat environments.
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*/
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repl_nat_size = sizeof(*repl_nat) + origsize;
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repl_nat = compat_alloc_user_space(repl_nat_size);
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ret = -EFAULT;
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if (put_user(origsize, &repl_nat->size))
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goto out;
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if (!access_ok(VERIFY_READ, urepl, optlen) ||
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!access_ok(VERIFY_WRITE, repl_nat, optlen))
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goto out;
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if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
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__copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
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goto out;
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if (__get_user(tmp32, &urepl->valid_hooks) ||
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__put_user(tmp32, &repl_nat->valid_hooks))
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goto out;
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if (__get_user(tmp32, &urepl->num_entries) ||
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__put_user(tmp32, &repl_nat->num_entries))
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goto out;
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if (__get_user(num_counters, &urepl->num_counters) ||
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__put_user(num_counters, &repl_nat->num_counters))
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goto out;
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if (__get_user(ucntrs, &urepl->counters) ||
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__put_user(compat_ptr(ucntrs), &repl_nat->counters))
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goto out;
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if (__copy_in_user(&repl_nat->entries[0],
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&urepl->entries[0],
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origsize))
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goto out;
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for (i = 0; i < NF_IP_NUMHOOKS; i++) {
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if (__get_user(tmp32, &urepl->hook_entry[i]) ||
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__put_user(tmp32, &repl_nat->hook_entry[i]) ||
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__get_user(tmp32, &urepl->underflow[i]) ||
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__put_user(tmp32, &repl_nat->underflow[i]))
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goto out;
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}
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/*
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* Since struct ipt_counters just contains two u_int64_t members
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* we can just do the access_ok check here and pass the (converted)
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* pointer into the standard syscall. We hope that the pointer is
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* not misaligned ...
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*/
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if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
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num_counters * sizeof(struct ipt_counters)))
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goto out;
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ret = sys_setsockopt(fd, level, optname,
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(char __user *)repl_nat, repl_nat_size);
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out:
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return ret;
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}
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/*
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* A struct sock_filter is architecture independent.
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*/
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struct compat_sock_fprog {
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u16 len;
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compat_uptr_t filter; /* struct sock_filter * */
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};
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static int do_set_attach_filter(int fd, int level, int optname,
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char __user *optval, int optlen)
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{
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struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
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struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
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compat_uptr_t ptr;
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u16 len;
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if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
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!access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
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__get_user(len, &fprog32->len) ||
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__get_user(ptr, &fprog32->filter) ||
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__put_user(len, &kfprog->len) ||
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__put_user(compat_ptr(ptr), &kfprog->filter))
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return -EFAULT;
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return sys_setsockopt(fd, level, optname, (char __user *)kfprog,
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sizeof(struct sock_fprog));
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}
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static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen)
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{
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struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
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struct timeval ktime;
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mm_segment_t old_fs;
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int err;
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if (optlen < sizeof(*up))
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return -EINVAL;
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if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
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__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;
|
|
}
|