linux-ext4 - Re: [PATCH] mke2fs: don't accept too-high revision levels

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Date:	Thu, 14 Jan 2016 12:36:11 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] mke2fs: don't accept too-high revision levels


> On Jan 14, 2016, at 11:35 AM, Eric Sandeen <sandeen@...hat.com> wrote:
> 
> Came across this, still not merged, so ping?
> 
> On 5/1/14 2:55 PM, Eric Sandeen wrote:
>> It's a bit strange to accept revision levels higher than
>> the code creating the filesystem can understand, so don't
>> allow it.
>> 
>> At least the kernel will mount the fs readonly if it's too
>> high, but no other utility will touch it, so you can't
>> fix the error.
>> 
>> Just reject anything > EXT2_MAX_SUPP_REV at mkfs time.
>> 
>> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

>> ---
>> 
>> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
>> index aecd5d5..82019dc 100644
>> --- a/misc/mke2fs.c
>> +++ b/misc/mke2fs.c
>> @@ -1679,9 +1679,10 @@ profile_error:
>> 			break;
>> 		case 'r':
>> 			r_opt = strtoul(optarg, &tmp, 0);
>> -			if (*tmp) {
>> +			if (*tmp || (r_opt > EXT2_MAX_SUPP_REV)) {
>> 				com_err(program_name, 0,
>> -					_("bad revision level - %s"), optarg);
>> +					_("bad revision level - %s (max %d)"),
>> +					   optarg, EXT2_MAX_SUPP_REV);
>> 				exit(1);
>> 			}
>> 			fs_param.s_rev_level = r_opt;
>> 
>> --
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> 
> --
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Cheers, Andreas






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