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bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening
From: |
Dmitry Antipov |
Subject: |
bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening |
Date: |
Fri, 03 Oct 2014 15:22:12 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 |
On 10/03/2014 12:14 PM, Eli Zaretskii wrote:
I'll continue looking into this.
There is a reduced sample which is just 194 bytes (attached).
This file has the following structure (hex bytes):
3B 19 5B 07 6F 3A 1B 53 61 73 73 3A 3A 53 65 6C 65 63 74 6F 72 3A 3A 50 61 72
65 6E
^^
escape (1)
74 07 3A 0E 40 66 69 6C 65 6E 61 6D 65 22 00 3B 14 69 1A 6F 3A 1B 53 61 73 73
3A 3A
53 65 6C 65 63 74 6F 72 3A 3A 50 73 65 75 64 6F 0A 3B 0B 5B 06 22 0A 68 6F 76
65 72
3B 12 3A 0A 63 6C 61 73 73 3B 1D 40 01 96 3B 14 69 1A 3A 09 40 61 72 67 30 3A
0D 40
^^
first non-ASCII byte (2)
73 6F 75 72 63 65 73 6F 3A 08 53 65 74 06 3A 0A 40 68 61 73 68 7B 00 3A 0D 40
73 75
62 6A 65 63 74 30 3B 1D 40 01 96 3B 14 69 1A 3B 1D 40 01 96 3B 14 69 1A 3B 14
69 1A
3A 0B 40 73 70 6C 61 74 30 3B 14 69 06 3A 0A 40 61 72 67 73 5B 00 3B 14 69 06
The whole thing is really subtle: when detect_coding is called, it finds (1) and
calls to detect_coding_iso_2022, which returns 1. Since this happens before
detect_coding finds (2), this function assumes that the whole data is in one of
7-bit (?) ISO-2022 encoding. Thus, no conversion is performed, and
decode_coding_gap
inserts the data as is; this way we end up with 96 3B byte sequence in buffer
text.
Dmitry
bug18610_crash.txt
Description: Text document
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, maden . ldm, 2014/10/02
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Nicolas Richard, 2014/10/02
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening,
Dmitry Antipov <=
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Andreas Schwab, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Andreas Schwab, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Andreas Schwab, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/03
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, K. Handa, 2014/10/05
- bug#18610: 24.4.50; Specific file causing emacs to segfault upon opening, Eli Zaretskii, 2014/10/05