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e6bd18f57a
The drivers/infiniband stack uses write() as a replacement for bi-directional ioctl(). This is not safe. There are ways to trigger write calls that result in the return structure that is normally written to user space being shunted off to user specified kernel memory instead. For the immediate repair, detect and deny suspicious accesses to the write API. For long term, update the user space libraries and the kernel API to something that doesn't present the same security vulnerabilities (likely a structured ioctl() interface). The impacted uAPI interfaces are generally only available if hardware from drivers/infiniband is installed in the system. Reported-by: Jann Horn <jann@thejh.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [ Expanded check to all known write() entry points ] Cc: stable@vger.kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com>
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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* Copyright (c) 2010 Intel Corporation. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#if !defined(_RDMA_IB_H)
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#define _RDMA_IB_H
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#include <linux/types.h>
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#include <linux/sched.h>
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struct ib_addr {
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union {
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__u8 uib_addr8[16];
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__be16 uib_addr16[8];
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__be32 uib_addr32[4];
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__be64 uib_addr64[2];
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} ib_u;
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#define sib_addr8 ib_u.uib_addr8
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#define sib_addr16 ib_u.uib_addr16
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#define sib_addr32 ib_u.uib_addr32
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#define sib_addr64 ib_u.uib_addr64
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#define sib_raw ib_u.uib_addr8
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#define sib_subnet_prefix ib_u.uib_addr64[0]
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#define sib_interface_id ib_u.uib_addr64[1]
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};
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static inline int ib_addr_any(const struct ib_addr *a)
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{
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return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
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}
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static inline int ib_addr_loopback(const struct ib_addr *a)
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{
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return ((a->sib_addr32[0] | a->sib_addr32[1] |
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a->sib_addr32[2] | (a->sib_addr32[3] ^ htonl(1))) == 0);
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}
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static inline void ib_addr_set(struct ib_addr *addr,
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__be32 w1, __be32 w2, __be32 w3, __be32 w4)
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{
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addr->sib_addr32[0] = w1;
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addr->sib_addr32[1] = w2;
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addr->sib_addr32[2] = w3;
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addr->sib_addr32[3] = w4;
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}
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static inline int ib_addr_cmp(const struct ib_addr *a1, const struct ib_addr *a2)
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{
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return memcmp(a1, a2, sizeof(struct ib_addr));
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}
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struct sockaddr_ib {
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unsigned short int sib_family; /* AF_IB */
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__be16 sib_pkey;
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__be32 sib_flowinfo;
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struct ib_addr sib_addr;
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__be64 sib_sid;
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__be64 sib_sid_mask;
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__u64 sib_scope_id;
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};
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/*
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* The IB interfaces that use write() as bi-directional ioctl() are
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* fundamentally unsafe, since there are lots of ways to trigger "write()"
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* calls from various contexts with elevated privileges. That includes the
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* traditional suid executable error message writes, but also various kernel
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* interfaces that can write to file descriptors.
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*
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* This function provides protection for the legacy API by restricting the
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* calling context.
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*/
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static inline bool ib_safe_file_access(struct file *filp)
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{
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return filp->f_cred == current_cred() && segment_eq(get_fs(), USER_DS);
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}
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#endif /* _RDMA_IB_H */
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