#emc-devel | Logs for 2011-07-27

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[08:21:24] <CIA-11> EMC: 03cmorley 07v2.5_branch * r89d8f15ceec5 10/ (3 files in 2 dirs): pncconf add gladevcp support. add TOUCHY, AXIS, & CL options
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[16:48:05] <mhaberler> here's a fix for potential buffer overflows in task (v2.4_branch) - any objections? all it does is replace (v)sprintf by )v)snprintf. http://git.mah.priv.at/gitweb/emc2-dev.git/commit/b8277af827d19ec655d67ffdb1ff3d5d73ed4113
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[17:01:30] <cradek> is this in response to a problem you have seen reported?
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[17:10:00] <mhaberler> I reported it to myself ;-) during working on task I sent a Python backtrace to emcOperatorError and wham!
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[17:12:33] <cradek> I am not sure which branch it belongs on
[17:13:00] <cradek> I would hesitate to put any change in 2.4 at this stage unless it fixes a critical problem
[17:13:09] <mhaberler> I dont care - I can move it to master or v2.5_branch
[17:13:16] <mhaberler> fair enough
[17:13:47] <mhaberler> whatever you recommend
[17:16:25] <cradek> is strncpy guaranteed to terminate the truncated string?
[17:16:34] <cradek> errr
[17:16:38] <cradek> snprintf
[17:16:49] <mhaberler> let me check
[17:18:58] <mhaberler> I had read the manual, but it was sortof fuzzy on that issue. I'll try a test program and see what it does.
[17:19:13] <cradek> I read the same fuzzy manpage
[17:19:25] <cradek> I think it terminates the truncated string (unlike strncpy)
[17:19:31] <mhaberler> gdb will tell..
[17:19:44] <jepler> Otherwise, output characters beyond the n-1st are
[17:19:44] <jepler> discarded rather than being written to the array, and a null character is written at the end
[17:19:47] <jepler> of the characters actually written into the array.
[17:20:11] <cradek> where did you find that?
[17:20:17] <jepler> the c99 standard
[17:20:26] <cradek> ah
[17:20:49] <jepler> wikipedia has a link to the standard. http://en.wikipedia.org/wiki/C99#External_links
[17:20:51] <cradek> then if all the uses of sizeof() are correct I think this patch is safe (for 2.5. I still would not touch 2.4.)
[17:21:23] <cradek> ... I have not checked every one
[17:21:34] <jepler> I would also prefer not to change 2.4 if this isn't hitting existing users (writing new code that calls operator message with a python backtrace doesn't count)
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[17:22:53] <mhaberler> that wouldnt go in there anyway
[17:23:57] <mhaberler> ok, gdb agrees with both jepler and c99
[17:24:22] <mhaberler> it does write max-1 chars and the trailing zero
[17:25:36] <jepler> too bad strncpy wasn't designed with similar sanity
[17:25:38] <jepler> bbl
[17:26:10] <mhaberler> ok, so I'll massage it for v2.5_branch
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[18:32:26] <CIA-11> EMC: 03mhaberler 07v2.5_branch * r612ccd9d1e59 10/src/emc/task/ (emccanon.cc emctask.cc emctaskmain.cc): emctask: fix potential buffer overflow in emcOperatorError() and others
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