Messages in this thread Patch in this message | | | From | Samuel Tardieu <> | Subject | Re: Two vulnerabilities are founded,please confirm. | Date | 12 Sep 2006 18:03:40 +0200 |
| |
>>>>> "Sam" == Samuel Tardieu <sam@rfc1149.net> writes:
Sam> Would a simple fix like this one (untested) work?
Or rather (less likely to be in the path by putting it in __find_get_block_slow):
Check that the requested block fits in the device.
Fix for advisory AD_LAB-06011 Linux kernel Filesystem Mount Dead Loop.
Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
diff -r db51efd75e66 fs/buffer.c --- a/fs/buffer.c Sun Sep 10 01:02:33 2006 +0200 +++ b/fs/buffer.c Tue Sep 12 18:01:37 2006 +0200 @@ -393,6 +393,14 @@ __find_get_block_slow(struct block_devic struct buffer_head *head; struct page *page; int all_mapped = 1; + char b[BDEVNAME_SIZE]; + + if (block >= bdev->bd_disk->capacity) { + printk(KERN_ERR "Invalid block number %Ld requested on device %s", + (unsigned long long)block, + bdevname(bdev, b)); + return NULL; + } index = block >> (PAGE_CACHE_SHIFT - bd_inode->i_blkbits); page = find_get_page(bd_mapping, index); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |