* [PATCH v2] mm/zpool: use prefixed module loading
@ 2014-08-12 19:06 ` Kees Cook
0 siblings, 0 replies; 4+ messages in thread
From: Kees Cook @ 2014-08-12 19:06 UTC (permalink / raw)
To: linux-kernel
Cc: Seth Jennings, Minchan Kim, Nitin Gupta, Dan Streetman,
Andrew Morton, Kees Cook, linux-mm
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>
---
v2:
- moved module aliases into ifdefs (ddstreet)
---
mm/zbud.c | 1 +
mm/zpool.c | 2 +-
mm/zsmalloc.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/zbud.c b/mm/zbud.c
index a05790b1915e..f26e7fcc7fa2 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -195,6 +195,7 @@ static struct zpool_driver zbud_zpool_driver = {
.total_size = zbud_zpool_total_size,
};
+MODULE_ALIAS("zpool-zbud");
#endif /* CONFIG_ZPOOL */
/*****************
diff --git a/mm/zpool.c b/mm/zpool.c
index e40612a1df00..739cdf0d183a 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -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);
}
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 4e2fc83cb394..94f38fac5e81 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -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 */
--
1.9.1
--
Kees Cook
Chrome OS Security
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2] mm/zpool: use prefixed module loading
@ 2014-08-12 19:06 ` Kees Cook
0 siblings, 0 replies; 4+ messages in thread
From: Kees Cook @ 2014-08-12 19:06 UTC (permalink / raw)
To: linux-kernel
Cc: Seth Jennings, Minchan Kim, Nitin Gupta, Dan Streetman,
Andrew Morton, Kees Cook, linux-mm
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>
---
v2:
- moved module aliases into ifdefs (ddstreet)
---
mm/zbud.c | 1 +
mm/zpool.c | 2 +-
mm/zsmalloc.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/zbud.c b/mm/zbud.c
index a05790b1915e..f26e7fcc7fa2 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -195,6 +195,7 @@ static struct zpool_driver zbud_zpool_driver = {
.total_size = zbud_zpool_total_size,
};
+MODULE_ALIAS("zpool-zbud");
#endif /* CONFIG_ZPOOL */
/*****************
diff --git a/mm/zpool.c b/mm/zpool.c
index e40612a1df00..739cdf0d183a 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -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);
}
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 4e2fc83cb394..94f38fac5e81 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -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 */
--
1.9.1
--
Kees Cook
Chrome OS Security
--
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] mm/zpool: use prefixed module loading
2014-08-12 19:06 ` Kees Cook
@ 2014-08-13 14:15 ` Dan Streetman
-1 siblings, 0 replies; 4+ messages in thread
From: Dan Streetman @ 2014-08-13 14:15 UTC (permalink / raw)
To: Kees Cook
Cc: linux-kernel, Seth Jennings, Minchan Kim, Nitin Gupta,
Andrew Morton, Linux-MM
On Tue, Aug 12, 2014 at 3:06 PM, Kees Cook <keescook@chromium.org> wrote:
> 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).
Looks good and tested ok. Thanks!
Acked-by: Dan Streetman <ddstreet@ieee.org>
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> v2:
> - moved module aliases into ifdefs (ddstreet)
> ---
> mm/zbud.c | 1 +
> mm/zpool.c | 2 +-
> mm/zsmalloc.c | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/mm/zbud.c b/mm/zbud.c
> index a05790b1915e..f26e7fcc7fa2 100644
> --- a/mm/zbud.c
> +++ b/mm/zbud.c
> @@ -195,6 +195,7 @@ static struct zpool_driver zbud_zpool_driver = {
> .total_size = zbud_zpool_total_size,
> };
>
> +MODULE_ALIAS("zpool-zbud");
> #endif /* CONFIG_ZPOOL */
>
> /*****************
> diff --git a/mm/zpool.c b/mm/zpool.c
> index e40612a1df00..739cdf0d183a 100644
> --- a/mm/zpool.c
> +++ b/mm/zpool.c
> @@ -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);
> }
>
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 4e2fc83cb394..94f38fac5e81 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -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 */
> --
> 1.9.1
>
>
> --
> Kees Cook
> Chrome OS Security
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] mm/zpool: use prefixed module loading
@ 2014-08-13 14:15 ` Dan Streetman
0 siblings, 0 replies; 4+ messages in thread
From: Dan Streetman @ 2014-08-13 14:15 UTC (permalink / raw)
To: Kees Cook
Cc: linux-kernel, Seth Jennings, Minchan Kim, Nitin Gupta,
Andrew Morton, Linux-MM
On Tue, Aug 12, 2014 at 3:06 PM, Kees Cook <keescook@chromium.org> wrote:
> 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).
Looks good and tested ok. Thanks!
Acked-by: Dan Streetman <ddstreet@ieee.org>
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> v2:
> - moved module aliases into ifdefs (ddstreet)
> ---
> mm/zbud.c | 1 +
> mm/zpool.c | 2 +-
> mm/zsmalloc.c | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/mm/zbud.c b/mm/zbud.c
> index a05790b1915e..f26e7fcc7fa2 100644
> --- a/mm/zbud.c
> +++ b/mm/zbud.c
> @@ -195,6 +195,7 @@ static struct zpool_driver zbud_zpool_driver = {
> .total_size = zbud_zpool_total_size,
> };
>
> +MODULE_ALIAS("zpool-zbud");
> #endif /* CONFIG_ZPOOL */
>
> /*****************
> diff --git a/mm/zpool.c b/mm/zpool.c
> index e40612a1df00..739cdf0d183a 100644
> --- a/mm/zpool.c
> +++ b/mm/zpool.c
> @@ -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);
> }
>
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 4e2fc83cb394..94f38fac5e81 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -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 */
> --
> 1.9.1
>
>
> --
> Kees Cook
> Chrome OS Security
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-08-13 14:16 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2014-08-12 19:06 [PATCH v2] mm/zpool: use prefixed module loading Kees Cook
2014-08-12 19:06 ` Kees Cook
2014-08-13 14:15 ` Dan Streetman
2014-08-13 14:15 ` Dan Streetman
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