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mm/zpool: use prefixed module loading

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To avoid potential format string expansion via module parameters, do not
use the zpool type directly in request_module() without a format string.
Additionally, to avoid arbitrary modules being loaded via zpool API
(e.g.  via the zswap_zpool_type module parameter) add a "zpool-" prefix
to the requested module, as well as module aliases for the existing
zpool types (zbud and zsmalloc).

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Acked-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2014-08-29 15:18:40 -07:00 committed by Linus Torvalds
parent 0cf1e9d6c3
commit 137f8cff50
3 changed files with 3 additions and 1 deletions
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1
mm/zbud.c
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@ -195,6 +195,7 @@ static struct zpool_driver zbud_zpool_driver = {
.total_size = zbud_zpool_total_size,
};
MODULE_ALIAS("zpool-zbud");
#endif /* CONFIG_ZPOOL */
/*****************

2
mm/zpool.c
View File

@ -150,7 +150,7 @@ struct zpool *zpool_create_pool(char *type, gfp_t gfp, struct zpool_ops *ops)
driver = zpool_get_driver(type);
if (!driver) {
request_module(type);
request_module("zpool-%s", type);
driver = zpool_get_driver(type);
}

1
mm/zsmalloc.c
View File

@ -315,6 +315,7 @@ static struct zpool_driver zs_zpool_driver = {
.total_size = zs_zpool_total_size,
};
MODULE_ALIAS("zpool-zsmalloc");
#endif /* CONFIG_ZPOOL */
/* per-cpu VM mapping areas for zspage accesses that cross page boundaries */