| From | Jiri Slaby <> | Subject | [PATCH 3.12 157/181] target: Explicitly clear ramdisk_mcp backend pages | Date | Mon, 30 Jun 2014 13:52:58 +0200 |
| |
From: "Nicholas A. Bellinger" <nab@linux-iscsi.org>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[Note that a different patch to address the same issue went in during v3.15-rc1 (commit 4442dc8a), but includes a bunch of other changes that don't strictly apply to fixing the bug]
This patch changes rd_allocate_sgl_table() to explicitly clear ramdisk_mcp backend memory pages by passing __GFP_ZERO into alloc_pages().
This addresses a potential security issue where reading from a ramdisk_mcp could return sensitive information, and follows what >= v3.15 does to explicitly clear ramdisk_mcp memory at backend device initialization time.
Reported-by: Jorge Daniel Sequeira Matias <jdsm@tecnico.ulisboa.pt> Cc: Jorge Daniel Sequeira Matias <jdsm@tecnico.ulisboa.pt> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/target/target_core_rd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c index 131327ac7f5b..9f6bedecda6e 100644 --- a/drivers/target/target_core_rd.c +++ b/drivers/target/target_core_rd.c @@ -179,7 +179,7 @@ static int rd_build_device_space(struct rd_dev *rd_dev) - 1; for (j = 0; j < sg_per_table; j++) { - pg = alloc_pages(GFP_KERNEL, 0); + pg = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0); if (!pg) { pr_err("Unable to allocate scatterlist" " pages for struct rd_dev_sg_table\n"); -- 2.0.0
|