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Message-ID: <20180302174828.GC19295@magnolia>
Date: Fri, 2 Mar 2018 09:48:28 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Andreas Dilger <andreas.dilger@...el.com>
Cc: tytso@....edu, linux-ext4@...r.kernel.org,
Andreas Dilger <adilger@...ger.ca>
Subject: Re: [PATCH] filefrag: avoid temporary buffer overflow
On Thu, Mar 01, 2018 at 01:09:46PM -0700, Andreas Dilger wrote:
> From: Andreas Dilger <adilger@...ger.ca>
>
> If an unknown flag is present in a FIEMAP extent, it is printed as a
> hex value into a temporary buffer before adding it to the flags. If
> that unknown flag is over 0xffff then it will overflow the temporary
> buffer.
>
> Reported-by: Sarah Liu <wei3.liu@...el.com>
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10335
> Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
--D
> ---
> misc/filefrag.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/misc/filefrag.c b/misc/filefrag.c
> index 9c57ab9..dc00393 100644
> --- a/misc/filefrag.c
> +++ b/misc/filefrag.c
> @@ -179,7 +179,7 @@ static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
> print_flag(&fe_flags, FIEMAP_EXTENT_SHARED, flags, "shared,");
> /* print any unknown flags as hex values */
> for (mask = 1; fe_flags != 0 && mask != 0; mask <<= 1) {
> - char hex[6];
> + char hex[sizeof(mask) * 2 + 4]; /* 2 chars/byte + 0x, + NUL */
>
> if ((fe_flags & mask) == 0)
> continue;
> --
> 1.8.0
>
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