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![Kees Cook](/assets/img/avatar_default.png)
When refactoring the SCM_RIGHTS code, I accidentally mis-merged my
native/compat diffs, which entirely broke using SCM_RIGHTS in compat
mode. Use the correct helper.
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Link: https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-August/216156.html
Reported-by: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Link: https://lore.kernel.org/lkml/1596812929.lz7fuo8r2w.none@localhost/
Suggested-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Fixes: c0029de509
("net/scm: Regularize compat handling of scm_detach_fds()")
Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
520 lines
14 KiB
C
520 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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/gfp.h>
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#include <linux/fs.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/security.h>
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#include <linux/audit.h>
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#include <linux/export.h>
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#include <net/scm.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <linux/uaccess.h>
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#include <net/compat.h>
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int __get_compat_msghdr(struct msghdr *kmsg,
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struct compat_msghdr __user *umsg,
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struct sockaddr __user **save_addr,
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compat_uptr_t *ptr, compat_size_t *len)
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{
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struct compat_msghdr msg;
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ssize_t err;
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if (copy_from_user(&msg, umsg, sizeof(*umsg)))
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return -EFAULT;
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kmsg->msg_flags = msg.msg_flags;
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kmsg->msg_namelen = msg.msg_namelen;
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if (!msg.msg_name)
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kmsg->msg_namelen = 0;
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if (kmsg->msg_namelen < 0)
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return -EINVAL;
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if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
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kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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kmsg->msg_control_is_user = true;
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kmsg->msg_control_user = compat_ptr(msg.msg_control);
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kmsg->msg_controllen = msg.msg_controllen;
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if (save_addr)
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*save_addr = compat_ptr(msg.msg_name);
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if (msg.msg_name && kmsg->msg_namelen) {
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if (!save_addr) {
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err = move_addr_to_kernel(compat_ptr(msg.msg_name),
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kmsg->msg_namelen,
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kmsg->msg_name);
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if (err < 0)
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return err;
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}
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} else {
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kmsg->msg_name = NULL;
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kmsg->msg_namelen = 0;
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}
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if (msg.msg_iovlen > UIO_MAXIOV)
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return -EMSGSIZE;
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kmsg->msg_iocb = NULL;
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*ptr = msg.msg_iov;
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*len = msg.msg_iovlen;
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return 0;
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}
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int get_compat_msghdr(struct msghdr *kmsg,
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struct compat_msghdr __user *umsg,
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struct sockaddr __user **save_addr,
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struct iovec **iov)
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{
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compat_uptr_t ptr;
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compat_size_t len;
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ssize_t err;
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err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
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if (err)
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return err;
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err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr),
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len, UIO_FASTIOV, iov, &kmsg->msg_iter);
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return err < 0 ? err : 0;
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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) + sizeof(struct compat_cmsghdr)))
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#define CMSG_COMPAT_SPACE(len) \
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(sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
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#define CMSG_COMPAT_LEN(len) \
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(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 __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user)))
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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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BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
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CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
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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 - sizeof(*ucmsg)) + 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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struct compat_cmsghdr cmsg;
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if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg)))
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goto Efault;
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if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg))
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goto Einval;
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tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + 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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kcmsg->cmsg_level = cmsg.cmsg_level;
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kcmsg->cmsg_type = cmsg.cmsg_type;
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tmp = CMSG_ALIGN(tmp);
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if (copy_from_user(CMSG_DATA(kcmsg),
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CMSG_COMPAT_DATA(ucmsg),
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(cmsg.cmsg_len - 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, cmsg.cmsg_len);
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}
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/*
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* check the length of messages copied in is the same as the
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* what we get from the first loop
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*/
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if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
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goto Einval;
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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_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
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struct compat_cmsghdr cmhdr;
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struct old_timeval32 ctv;
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struct old_timespec32 cts[3];
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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 (!COMPAT_USE_64BIT_TIME) {
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if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
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struct __kernel_old_timeval *tv = (struct __kernel_old_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(ctv);
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}
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if (level == SOL_SOCKET &&
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(type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
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int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
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int i;
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struct __kernel_old_timespec *ts = data;
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for (i = 0; i < count; i++) {
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cts[i].tv_sec = ts[i].tv_sec;
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cts[i].tv_nsec = ts[i].tv_nsec;
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}
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data = &cts;
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len = sizeof(cts[0]) * count;
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}
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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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if (kmsg->msg_controllen < cmlen)
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cmlen = kmsg->msg_controllen;
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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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static int scm_max_fds_compat(struct msghdr *msg)
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{
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if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
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return 0;
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return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
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}
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void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
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{
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struct compat_cmsghdr __user *cm =
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(struct compat_cmsghdr __user *)msg->msg_control;
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unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
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int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
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int __user *cmsg_data = CMSG_COMPAT_DATA(cm);
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int err = 0, i;
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for (i = 0; i < fdmax; i++) {
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err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
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if (err < 0)
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break;
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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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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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if (msg->msg_controllen < cmlen)
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cmlen = msg->msg_controllen;
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msg->msg_control += cmlen;
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msg->msg_controllen -= cmlen;
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}
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}
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if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
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msg->msg_flags |= MSG_CTRUNC;
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/*
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* All of the files that fit in the message have had their usage counts
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* 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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/* Argument list sizes for compat_sys_socketcall */
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#define AL(x) ((x) * sizeof(u32))
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static unsigned char nas[21] = {
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AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
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AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
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AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
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AL(4), AL(5), AL(4)
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};
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#undef AL
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static inline long __compat_sys_sendmsg(int fd,
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struct compat_msghdr __user *msg,
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unsigned int flags)
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{
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return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
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flags | MSG_CMSG_COMPAT, false);
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}
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COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
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unsigned int, flags)
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{
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return __compat_sys_sendmsg(fd, msg, flags);
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}
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static inline long __compat_sys_sendmmsg(int fd,
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struct compat_mmsghdr __user *mmsg,
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unsigned int vlen, unsigned int flags)
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{
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return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
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flags | MSG_CMSG_COMPAT, false);
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}
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COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
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unsigned int, vlen, unsigned int, flags)
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{
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return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
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}
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static inline long __compat_sys_recvmsg(int fd,
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struct compat_msghdr __user *msg,
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unsigned int flags)
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{
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return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
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flags | MSG_CMSG_COMPAT, false);
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}
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COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
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unsigned int, flags)
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{
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return __compat_sys_recvmsg(fd, msg, flags);
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}
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static inline long __compat_sys_recvfrom(int fd, void __user *buf,
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compat_size_t len, unsigned int flags,
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struct sockaddr __user *addr,
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int __user *addrlen)
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{
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return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
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addrlen);
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}
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COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
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{
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return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
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}
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COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
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unsigned int, flags, struct sockaddr __user *, addr,
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int __user *, addrlen)
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{
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return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
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}
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COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
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unsigned int, vlen, unsigned int, flags,
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struct __kernel_timespec __user *, timeout)
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{
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return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
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flags | MSG_CMSG_COMPAT, timeout, NULL);
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}
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#ifdef CONFIG_COMPAT_32BIT_TIME
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COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
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unsigned int, vlen, unsigned int, flags,
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struct old_timespec32 __user *, timeout)
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{
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return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
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flags | MSG_CMSG_COMPAT, NULL, timeout);
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}
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#endif
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COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
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{
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u32 a[AUDITSC_ARGS];
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unsigned int len;
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u32 a0, a1;
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int ret;
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if (call < SYS_SOCKET || call > SYS_SENDMMSG)
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return -EINVAL;
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len = nas[call];
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if (len > sizeof(a))
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return -EINVAL;
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if (copy_from_user(a, args, len))
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return -EFAULT;
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ret = audit_socketcall_compat(len / sizeof(a[0]), a);
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if (ret)
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return ret;
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a0 = a[0];
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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 = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]);
|
|
break;
|
|
case SYS_GETSOCKOPT:
|
|
ret = __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 = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
|
|
a[3] | MSG_CMSG_COMPAT, NULL,
|
|
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;
|
|
}
|