Re: [PATCH 1/1] gnu: libtiff: Fix some buffer overflows.

[Kei Kebreau <kei@openmailbox.org>]

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Leo Famulari <leo@famulari.name> writes:

> * gnu/packages/patches/libtiff-uint32-overflow.patch: New file.
> * gnu/local.mk (dist_patch_DATA): Add it.
> * gnu/packages/image.scm (libtiff/fixed)[source]: Use it.
> ---
>  gnu/local.mk                                       |   1 +
>  gnu/packages/image.scm                             |   1 +
>  gnu/packages/patches/libtiff-uint32-overflow.patch | 102 +++++++++++++++++++++
>  3 files changed, 104 insertions(+)
>  create mode 100644 gnu/packages/patches/libtiff-uint32-overflow.patch
>
> diff --git a/gnu/local.mk b/gnu/local.mk
> index 513bd34..1c27767 100644
> --- a/gnu/local.mk
> +++ b/gnu/local.mk
> @@ -670,6 +670,7 @@ dist_patch_DATA =						\
>    %D%/packages/patches/libtiff-CVE-2016-9297.patch		\
>    %D%/packages/patches/libtiff-oob-accesses-in-decode.patch	\
>    %D%/packages/patches/libtiff-oob-write-in-nextdecode.patch	\
> +  %D%/packages/patches/libtiff-uint32-overflow.patch		\
>    %D%/packages/patches/libtool-skip-tests2.patch		\
>    %D%/packages/patches/libunwind-CVE-2015-3239.patch		\
>    %D%/packages/patches/libupnp-CVE-2016-6255.patch		\
> diff --git a/gnu/packages/image.scm b/gnu/packages/image.scm
> index d38344a..7458f4e 100644
> --- a/gnu/packages/image.scm
> +++ b/gnu/packages/image.scm
> @@ -291,6 +291,7 @@ collection of tools for doing simple manipulations of TIFF images.")
>                (patches (search-patches
>                           "libtiff-oob-accesses-in-decode.patch"
>                           "libtiff-oob-write-in-nextdecode.patch"
> +                         "libtiff-uint32-overflow.patch"
>                           "libtiff-CVE-2015-8665+CVE-2015-8683.patch"
>                           "libtiff-CVE-2016-3623.patch"
>                           "libtiff-CVE-2016-3945.patch"
> diff --git a/gnu/packages/patches/libtiff-uint32-overflow.patch b/gnu/packages/patches/libtiff-uint32-overflow.patch
> new file mode 100644
> index 0000000..b9b1bc2
> --- /dev/null
> +++ b/gnu/packages/patches/libtiff-uint32-overflow.patch
> @@ -0,0 +1,102 @@
> +Fix some buffer overflows:
> +
> +http://seclists.org/oss-sec/2016/q4/
> +http://bugzilla.maptools.org/show_bug.cgi?id=2592
> +
> +2016-11-11 Even Rouault <even.rouault at spatialys.com>
> +
> +        * tools/tiffcrop.c: fix multiple uint32 overflows in
> +        writeBufferToSeparateStrips(), writeBufferToContigTiles() and
> +        writeBufferToSeparateTiles() that could cause heap buffer
> +overflows.
> +        Reported by Henri Salo from Nixu Corporation.
> +        Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2592
> +
> +
> +/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
> +new revision: 1.1152; previous revision: 1.1151
> +/cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v  <--  tools/tiffcrop.c
> +new revision: 1.43; previous revision: 1.42
> +
> +===================================================================
> +RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v
> +retrieving revision 1.42
> +retrieving revision 1.43
> +diff -u -r1.42 -r1.43
> +--- libtiff/tools/tiffcrop.c	14 Oct 2016 19:13:20 -0000	1.42
> ++++ libtiff/tools/tiffcrop.c	11 Nov 2016 19:33:06 -0000	1.43
> +@@ -148,6 +148,8 @@
> + #define PATH_MAX 1024
> + #endif
> + 
> ++#define TIFF_UINT32_MAX     0xFFFFFFFFU
> ++
> + #ifndef streq
> + #define	streq(a,b)	(strcmp((a),(b)) == 0)
> + #endif
> +@@ -1164,7 +1166,24 @@
> +   (void) TIFFGetFieldDefaulted(out, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
> +   (void) TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps);
> +   bytes_per_sample = (bps + 7) / 8;
> +-  rowsize = ((bps * spp * width) + 7) / 8; /* source has interleaved samples */
> ++  if( width == 0 ||
> ++      (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / width ||
> ++      bps * spp * width > TIFF_UINT32_MAX - 7U )
> ++  {
> ++      TIFFError(TIFFFileName(out),
> ++            "Error, uint32 overflow when computing (bps * spp * width) + 7");
> ++      return 1;
> ++  }
> ++  rowsize = ((bps * spp * width) + 7U) / 8; /* source has interleaved samples */
> ++  if( bytes_per_sample == 0 ||
> ++      rowsperstrip > TIFF_UINT32_MAX / bytes_per_sample ||
> ++      rowsperstrip * bytes_per_sample > TIFF_UINT32_MAX / (width + 1) )
> ++  {
> ++      TIFFError(TIFFFileName(out),
> ++                "Error, uint32 overflow when computing rowsperstrip * "
> ++                "bytes_per_sample * (width + 1)");
> ++      return 1;
> ++  }
> +   rowstripsize = rowsperstrip * bytes_per_sample * (width + 1); 
> + 
> +   obuf = _TIFFmalloc (rowstripsize);
> +@@ -1251,11 +1270,19 @@
> +     }
> +     }
> + 
> ++  if( imagewidth == 0 ||
> ++      (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / imagewidth ||
> ++      bps * spp * imagewidth > TIFF_UINT32_MAX - 7U )
> ++  {
> ++      TIFFError(TIFFFileName(out),
> ++            "Error, uint32 overflow when computing (imagewidth * bps * spp) + 7");
> ++      return 1;
> ++  }
> ++  src_rowsize = ((imagewidth * spp * bps) + 7U) / 8;
> ++
> +   tilebuf = _TIFFmalloc(tile_buffsize);
> +   if (tilebuf == 0)
> +     return 1;
> +-
> +-  src_rowsize = ((imagewidth * spp * bps) + 7) / 8;
> +   for (row = 0; row < imagelength; row += tl)
> +     {
> +     nrow = (row + tl > imagelength) ? imagelength - row : tl;
> +@@ -1315,7 +1342,16 @@
> +   TIFFGetField(out, TIFFTAG_TILELENGTH, &tl);
> +   TIFFGetField(out, TIFFTAG_TILEWIDTH, &tw);
> +   TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps);
> +-  src_rowsize = ((imagewidth * spp * bps) + 7) / 8;
> ++
> ++  if( imagewidth == 0 ||
> ++      (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / imagewidth ||
> ++      bps * spp * imagewidth > TIFF_UINT32_MAX - 7 )
> ++  {
> ++      TIFFError(TIFFFileName(out),
> ++            "Error, uint32 overflow when computing (imagewidth * bps * spp) + 7");
> ++      return 1;
> ++  }
> ++  src_rowsize = ((imagewidth * spp * bps) + 7U) / 8;
> +          
> +   for (row = 0; row < imagelength; row += tl)
> +     {

The Guix linter tells me that ftp.remotesensing.org is not reachable. Is
it reachable for you? My connection could just be bad, or the server
temporarily down.

Otherwise, LGTM.

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