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authorSimon Kagstrom <simon.kagstrom@netinsight.net>2009-11-03 08:08:41 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-11-30 12:02:02 +0000
commit1114e3d00f539ecb7a8415663f2a47a80e00a537 (patch)
tree34f384aa267d9e31eee029bf9061cf148907ea7d /drivers/mtd
parentbe95745f01677245a061a8f51473ef5ec8ad008e (diff)
mtd: mtdoops: limit the maximum mtd partition size
Make the maximum mtdoops partition size to be 8MiB. Indeed, it does not make sense to use anything larger than that anyway. This limit makes it possible to catch stupid mistakes where the user gives e.g., a rootfs partition to mtdoops (which will happily erase it). Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/mtdoops.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 06c538249455..b016eee18657 100644
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -33,6 +33,9 @@
#include <linux/interrupt.h>
#include <linux/mtd/mtd.h>
+/* Maximum MTD partition size */
+#define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024)
+
#define MTDOOPS_KERNMSG_MAGIC 0x5d005d00
#define OOPS_PAGE_SIZE 4096
@@ -310,6 +313,12 @@ static void mtdoops_notify_add(struct mtd_info *mtd)
return;
}
+ if (mtd->size > MTDOOPS_MAX_MTD_SIZE) {
+ printk(KERN_ERR "mtdoops: mtd%d is too large (limit is %d MiB)\n",
+ mtd->index, MTDOOPS_MAX_MTD_SIZE / 1024 / 1024);
+ return;
+ }
+
/* oops_page_used is a bit field */
cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages,
BITS_PER_LONG));
@@ -317,14 +326,10 @@ static void mtdoops_notify_add(struct mtd_info *mtd)
printk(KERN_ERR "Could not allocate page array\n");
return;
}
- cxt->mtd = mtd;
- if (mtd->size > INT_MAX)
- cxt->oops_pages = INT_MAX / OOPS_PAGE_SIZE;
- else
- cxt->oops_pages = (int)mtd->size / OOPS_PAGE_SIZE;
+ cxt->mtd = mtd;
+ cxt->oops_pages = (int)mtd->size / OOPS_PAGE_SIZE;
find_next_position(cxt);
-
printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index);
}