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Joe Tsai a04b4ddba4 archive/tar: properly parse GNU base-256 encoding 
Motivation:
* Previous implementation did not detect integer overflow when
parsing a base-256 encoded field.
* Previous implementation did not treat the integer as a two's
complement value as specified by GNU.

The relevant GNU specification says:
<<<
GNU format uses two's-complement base-256 notation to store values
that do not fit into standard ustar range.
>>>

Fixes #12435

Change-Id: I4639bcffac8d12e1cb040b76bd05c9d7bc6c23a8
Reviewed-on: https://go-review.googlesource.com/17424
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-02-03 07:01:09 -05:00
..
gnu-multi-hdrs.tar archive/tar: convert Reader.Next to be loop based 2016-02-03 06:58:30 -05:00
gnu.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
hardlink.tar archive/tar: fix round-trip attributes 2015-08-21 00:15:22 -04:00
hdr-only.tar archive/tar: make output deterministic 2016-02-02 14:10:11 -05:00
issue10968.tar archive/tar: terminate when reading malformed sparse files 2015-08-21 00:15:22 -04:00
issue11169.tar archive/tar: add missing error checks 2015-08-21 00:15:22 -04:00
issue12435.tar archive/tar: properly parse GNU base-256 encoding 2016-02-03 07:01:09 -05:00
neg-size.tar archive/tar: make output deterministic 2016-02-02 14:10:11 -05:00
nil-uid.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
pax-multi-hdrs.tar archive/tar: convert Reader.Next to be loop based 2016-02-03 06:58:30 -05:00
pax-path-hdr.tar archive/tar: move parse/format methods to standalone receiver 2016-02-02 14:32:27 -05:00
pax.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
small.txt archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
small2.txt archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
sparse-formats.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
star.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
ustar-file-reg.tar archive/tar: move parse/format methods to standalone receiver 2016-02-02 14:32:27 -05:00
ustar.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
v7.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
writer-big-long.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
writer-big.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
writer.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00
xattrs.tar archive/tar: adding from go as of a9dddb53f 2015-02-11 14:08:03 +01:00