Messages in this thread Patch in this message | | | From | Samuel Tardieu <> | Subject | Re: Two vulnerabilities are founded,please confirm. | Date | 12 Sep 2006 17:55:23 +0200 |
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>>>>> "ADLab" == ADLab <adlab@venustech.com.cn> writes:
ADLab> Advisory: [AD_LAB-06011] Linux kernel Filesystem Mount Dead ADLab> Loop Class: Design Error
Would a simple fix like this one (untested) work?
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 17:54:13 2006 +0200 @@ -1456,7 +1456,17 @@ struct buffer_head * struct buffer_head * __getblk(struct block_device *bdev, sector_t block, int size) { - struct buffer_head *bh = __find_get_block(bdev, block, size); + struct buffer_head *bh; + 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; + } + + bh = __find_get_block(bdev, block, size); might_sleep(); if (bh == NULL)
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