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authorLibravatar Johannes Schindelin <johannes.schindelin@gmx.de>2016-09-21 20:24:04 +0200
committerLibravatar Junio C Hamano <gitster@pobox.com>2016-09-21 13:56:15 -0700
commit2f8952250a84313b74f96abb7b035874854cf202 (patch)
tree264e571b5f86d2a4cf01117630089ac3c94e97fe /Documentation/RelNotes/1.7.4.1.txt
parentregex: -G<pattern> feeds a non NUL-terminated string to regexec() and fails (diff)
downloadtgif-2f8952250a84313b74f96abb7b035874854cf202.tar.xz
regex: add regexec_buf() that can work on a non NUL-terminated string
We just introduced a test that demonstrates that our sloppy use of regexec() on a mmap()ed area can result in incorrect results or even hard crashes. So what we need to fix this is a function that calls regexec() on a length-delimited, rather than a NUL-terminated, string. Happily, there is an extension to regexec() introduced by the NetBSD project and present in all major regex implementation including Linux', MacOSX' and the one Git includes in compat/regex/: by using the (non-POSIX) REG_STARTEND flag, it is possible to tell the regexec() function that it should only look at the offsets between pmatch[0].rm_so and pmatch[0].rm_eo. That is exactly what we need. Since support for REG_STARTEND is so widespread by now, let's just introduce a helper function that always uses it, and tell people on a platform whose regex library does not support it to use the one from our compat/regex/ directory. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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