b01615d5ac
The PaX team modified the kernel's modpost to report writeable function pointers as section mismatches because they are potential exploit targets. We could ignore the warnings, but their presence can obscure actual issues. Proper const correctness can also catch programming mistakes. Building the kernel modules against a PaX/GrSecurity patched Linux 3.4.2 kernel reports 133 section mismatches prior to this patch. This patch eliminates 130 of them. The quantity of writeable function pointers eliminated by constifying each structure is as follows: vdev_opts_t 52 zil_replay_func_t 24 zio_compress_info_t 24 zio_checksum_info_t 9 space_map_ops_t 7 arc_byteswap_func_t 5 The remaining 3 writeable function pointers cannot be addressed by this patch. 2 of them are in zpl_fs_type. The kernel's sget function requires that this be non-const. The final writeable function pointer is created by SPL_SHRINKER_DECLARE. The kernel's set_shrinker() and remove_shrinker() functions also require that this be non-const. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1300
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#ifndef _SYS_ZIO_CHECKSUM_H
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#define _SYS_ZIO_CHECKSUM_H
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#include <sys/zio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Signature for checksum functions.
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*/
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typedef void zio_checksum_t(const void *data, uint64_t size, zio_cksum_t *zcp);
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/*
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* Information about each checksum function.
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*/
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typedef const struct zio_checksum_info {
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zio_checksum_t *ci_func[2]; /* checksum function for each byteorder */
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int ci_correctable; /* number of correctable bits */
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int ci_eck; /* uses zio embedded checksum? */
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int ci_dedup; /* strong enough for dedup? */
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char *ci_name; /* descriptive name */
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} zio_checksum_info_t;
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typedef struct zio_bad_cksum {
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zio_cksum_t zbc_expected;
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zio_cksum_t zbc_actual;
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const char *zbc_checksum_name;
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uint8_t zbc_byteswapped;
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uint8_t zbc_injected;
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uint8_t zbc_has_cksum; /* expected/actual valid */
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} zio_bad_cksum_t;
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extern zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS];
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/*
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* Checksum routines.
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*/
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extern zio_checksum_t zio_checksum_SHA256;
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extern void zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
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void *data, uint64_t size);
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extern int zio_checksum_error(zio_t *zio, zio_bad_cksum_t *out);
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extern enum zio_checksum spa_dedup_checksum(spa_t *spa);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_ZIO_CHECKSUM_H */
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