From bbe9504c3a9f7cea3cd6d2660142d9b9bd5821f7 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Mon, 16 Jun 2014 20:59:52 +0000 Subject: target: Explicitly clear ramdisk_mcp backend pages Part of commit 4442dc8a92b8f9ad8ee9e7f8438f4c04c03a22dc upstream. 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 Cc: Jorge Daniel Sequeira Matias Signed-off-by: Nicholas Bellinger Signed-off-by: Ben Hutchings --- drivers/target/target_core_rd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c index 02e51faa2f4e..6c7886b1b683 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"); -- cgit v1.2.3