February 2008 - Darwin-dev - lists.apple.com

Re: Darwin 8.11 and 9.1 Source
by Terry Lambert 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- Terry *very* anxiously awating CFLite and CFNet, thanksa! _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Try contacting opensource(a)apple.com like the error message sugges, instead of this mailing list. Just because announced happen to be made here doen't mean that this works as an official support channel. It's not intended as one. On Jan 31, 2008, at 4:44 PM, "David M. Cotter" <me(a)davecotter.com> wrote: Anxiously awaiting your next notice... :-) This email sent to site_archiver(a)lists.apple.com

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Re: getcontext() -> Bus error?
by Kevin Van Vechten 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jan 31, 2008, at 7:42 PM, Anton Rang wrote: - Kevin _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Jan 31, 2008, at 6:52 PM, Edd Dawson wrote: int main(void) { ucontext_t ctx; getcontext(&ctx); return 0; } edd:guff developer$ gcc getcontext.c -o getcontext -W -Wall -ansi - pedantic edd:guff developer$ ./getcontext Bus error edd:guff developer$ Why the bus error? What am I doing wrong? This is a known issue where getcontext(3) is writing past the end of the ucontext_t struct when _XOPEN_SOURCE is not defined (rdar://problem/5578699 ). As a workaround, define _XOPEN_SOURCE before including ucontext.h. While I don't understand why you're getting a bus error (haven't looked at the library source), the problem appears to go away if you declare ctx as a global instead of on the stack. Perhaps getcontext() just won't let you save context onto the stack.... The buffer overflow that wipes out the return address, causing the bus error. By using a global, the memory corruption still occurs, but doesn't manifest itself as a bus error with main() returning so quickly. This email sent to site_archiver(a)lists.apple.com

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Re: getcontext() -> Bus error?
by Steve Checkoway 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jan 31, 2008, at 7:42 PM, Anton Rang wrote: int main(void) { ucontext_t ctx; getcontext(&ctx); return 0; } Why the bus error? What am I doing wrong? -- Steve Checkoway _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Jan 31, 2008, at 6:52 PM, Edd Dawson wrote: While I don't understand why you're getting a bus error (haven't looked at the library source), the problem appears to go away if you declare ctx as a global instead of on the stack. Perhaps getcontext() just won't let you save context onto the stack.... Looking at it in gdb, the problem seems to be when you return from main, not during the getcontext() call. This email sent to site_archiver(a)lists.apple.com

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Re: getcontext() -> Bus error?
by Anton Rang 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Anton _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Jan 31, 2008, at 6:52 PM, Edd Dawson wrote: int main(void) { ucontext_t ctx; getcontext(&ctx); return 0; } edd:guff developer$ gcc getcontext.c -o getcontext -W -Wall -ansi - pedantic edd:guff developer$ ./getcontext Bus error edd:guff developer$ Why the bus error? What am I doing wrong? While I don't understand why you're getting a bus error (haven't looked at the library source), the problem appears to go away if you declare ctx as a global instead of on the stack. Perhaps getcontext() just won't let you save context onto the stack.... This email sent to site_archiver(a)lists.apple.com

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Re: getcontext() -> Bus error?
by Edd Dawson 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.9 (Windows/20071031) Hi Jim, I'm no thread guru, but moving the ctx off the local stack makes it not crash for me. Perhaps the stack (which is about to be freed) isn't the best place to save the thread info. The code runs fine on my linux machine, FWIW. Edd On Jan 31, 2008, at 5:52 PM, Edd Dawson wrote: Hello, I sincerely hope this is the correct list for this question. edd:guff developer$ gcc -dumpversion 4.0.1 edd:guff developer$ cat getcontext.c #include <ucontext.h> Why the bus error? What am I doing wrong? Kind regards, _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Jim Guyton wrote: I found that too, but the man page says nothing about where the ucontext_t should be allocated. In fact, all the examples I've seen on the web use automatic storage. I'm running leopard 10.5.1 on a MacBook with the standard apple developer tools. int main(void) { ucontext_t ctx; getcontext(&ctx); return 0; } edd:guff developer$ gcc getcontext.c -o getcontext -W -Wall -ansi -pedantic edd:guff developer$ ./getcontext Bus error edd:guff developer$ Edd This email sent to site_archiver(a)lists.apple.com

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getcontext() -> Bus error?
by Edd Dawson 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.9 (Windows/20071031) Hello, I sincerely hope this is the correct list for this question. I'm running leopard 10.5.1 on a MacBook with the standard apple developer tools. edd:guff developer$ gcc -dumpversion 4.0.1 edd:guff developer$ cat getcontext.c #include <ucontext.h> int main(void) { ucontext_t ctx; getcontext(&ctx); return 0; } edd:guff developer$ gcc getcontext.c -o getcontext -W -Wall -ansi -pedantic edd:guff developer$ ./getcontext Bus error edd:guff developer$ Why the bus error? What am I doing wrong? Kind regards, Edd _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Darwin 8.11 and 9.1 Source
by William Siegrist 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com The following projects have been posted: xar-28 WebCore-5523.10.3 -Bill On Jan 26, 2008, at 3:47 PM, William Siegrist wrote: http://www.opensource.apple.com/darwinsource/10.4.11.ppc/ http://www.opensource.apple.com/darwinsource/10.4.11.x86/ http://www.opensource.apple.com/darwinsource/10.5.1/ ---- William Siegrist wsiegrist(a)apple.com ---- William Siegrist Software Support Engineer Mac OS Forge http://macosforge.org/ wsiegrist(a)apple.com 408 862 7337 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com The Darwin team is pleased to announce the availability of the source code for Darwin 8.11 and 9.1. These sources correspond to Mac OS X 10.4.11 and 10.5.1 respectively, for both PowerPC- and Intel-based Macintoshes. The sources are available at: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/wsiegrist %40apple.com This email sent to wsiegrist(a)apple.com smime.p7s

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Re: Darwin 8.11 and 9.1 Source
by David M. Cotter 01 Feb '08

01 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com *very* anxiously awating CFLite and CFNet, thanksa! -dave _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Anxiously awaiting your next notice... :-) This email sent to site_archiver(a)lists.apple.com

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