diff options
| author | Richard Yao <[email protected]> | 2013-02-14 23:37:43 -0500 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2013-03-04 08:49:32 -0800 |
| commit | b01615d5ac86913da1e092d0378bfb8f0e72af30 (patch) | |
| tree | 905cd8431cce678140c8e3d1bbf35800cffe4e66 /include/sys/zio_compress.h | |
| parent | c38367c73f592ca9729ba0d5e70b5e3bc67e0745 (diff) | |
Constify structures containing function pointers
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 <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #1300
Diffstat (limited to 'include/sys/zio_compress.h')
| -rw-r--r-- | include/sys/zio_compress.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/sys/zio_compress.h b/include/sys/zio_compress.h index 49946af4b..bd051f185 100644 --- a/include/sys/zio_compress.h +++ b/include/sys/zio_compress.h @@ -44,7 +44,7 @@ typedef int zio_decompress_func_t(void *src, void *dst, /* * Information about each compression function. */ -typedef struct zio_compress_info { +typedef const struct zio_compress_info { zio_compress_func_t *ci_compress; /* compression function */ zio_decompress_func_t *ci_decompress; /* decompression function */ int ci_level; /* level parameter */ |