From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vasiliy Kulikov Date: Sat, 06 Nov 2010 14:41:24 +0000 Subject: [PATCH] mtd: mtdchar: fix information leak to userland Message-Id: <1289054485-18190-1-git-send-email-segooon@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kernel-janitors@vger.kernel.org Cc: linux-mtd@lists.infradead.org, David Woodhouse , linux-kernel@vger.kernel.org Structure mtd_info_user is copied to userland with padding byted between "type" and "flags" fields uninitialized. It leads to leaking of contents of kernel stack memory. Signed-off-by: Vasiliy Kulikov --- Compile tested. drivers/mtd/mtdchar.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 3eff1e5..2a0bc9e 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -601,6 +601,7 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) } case MEMGETINFO: + memset(&info, 0, sizeof(info)); info.type = mtd->type; info.flags = mtd->flags; info.size = mtd->size; @@ -609,7 +610,6 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) info.oobsize = mtd->oobsize; /* The below fields are obsolete */ info.ecctype = -1; - info.eccsize = 0; if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) return -EFAULT; break; -- 1.7.0.4