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author | Jakub Narebski <jnareb@gmail.com> | 2011-09-16 14:41:57 +0200 |
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committer | Junio C Hamano <gitster@pobox.com> | 2011-09-16 09:22:47 -0700 |
commit | 0866786b80aa921576ab4e7474c91207111f970f (patch) | |
tree | 97e73a099dfd5760d0fcd5744ef0a10c045847d5 /commit.c | |
parent | Git 1.7.7-rc1 (diff) | |
download | tgif-0866786b80aa921576ab4e7474c91207111f970f.tar.xz |
gitweb: Strip non-printable characters from syntax highlighter output
The current code, as is, passes control characters, such as form-feed
(^L) to highlight which then passes it through to the browser. User
agents (web browsers) that support 'application/xhtml+xml' usually
require that web pages declared as XHTML and with this mimetype are
well-formed XML. Unescaped control characters cannot appear within a
contents of a valid XML document.
This will cause the browser to display one of the following warnings:
* Safari v5.1 (6534.50) & Google Chrome v13.0.782.112:
This page contains the following errors:
error on line 657 at column 38: PCDATA invalid Char value 12
Below is a rendering of the page up to the first error.
* Mozilla Firefox 3.6.19 & Mozilla Firefox 5.0:
XML Parsing Error: not well-formed
Location:
http://path/to/git/repo/blah/blah
Both errors were generated by gitweb.perl v1.7.3.4 w/ highlight 2.7
using arch/ia64/kernel/unwind.c from the Linux kernel.
When syntax highlighter is not used, control characters are replaced
by esc_html(), but with syntax highlighter they were passed through to
browser (to_utf8() doesn't remove control characters).
Introduce sanitize() subroutine which strips forbidden characters, but
does not perform HTML escaping, and use it in git_blob() to sanitize
syntax highlighter output for XHTML.
Note that excluding "\t" (U+0009), "\n" (U+000A) and "\r" (U+000D) is
not strictly necessary, atleast for currently the only callsite: "\t"
tabs are replaced by spaces by untabify(), "\n" is stripped from each
line before processing it, and replacing "\r" could be considered
improvement.
Originally-by: Christopher M. Fuhrman <cfuhrman@panix.com>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'commit.c')
0 files changed, 0 insertions, 0 deletions