From 56008b15e0bc425a5c7df28e88cfc808cc113f04 Mon Sep 17 00:00:00 2001 From: Thomas Schwinge Date: Thu, 20 Nov 2008 22:16:01 +0100 Subject: GCC: libmudflap. --- hurd/running/debian/porting/gcc.mdwn | 2 + hurd/running/debian/porting/gcc/libmudflap.mdwn | 72 +++++++++++++++++++++++++ 2 files changed, 74 insertions(+) create mode 100644 hurd/running/debian/porting/gcc/libmudflap.mdwn (limited to 'hurd') diff --git a/hurd/running/debian/porting/gcc.mdwn b/hurd/running/debian/porting/gcc.mdwn index ab540908..ec412b9c 100644 --- a/hurd/running/debian/porting/gcc.mdwn +++ b/hurd/running/debian/porting/gcc.mdwn @@ -40,3 +40,5 @@ Additionally: * Also in other places: configure fragments that have `*linux*` cases might/should often contain those for us (and GNU/k*BSD) as well. + + * [[`libmudflap`|libmudflap]]. diff --git a/hurd/running/debian/porting/gcc/libmudflap.mdwn b/hurd/running/debian/porting/gcc/libmudflap.mdwn new file mode 100644 index 00000000..2345828b --- /dev/null +++ b/hurd/running/debian/porting/gcc/libmudflap.mdwn @@ -0,0 +1,72 @@ +[[meta copyright="Copyright © 2008 Free Software Foundation, Inc."]] + +[[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled +[[GNU_Free_Documentation_License|/fdl]]."]]"""]] + +Single-threaded use appears to work: + + $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩ + gcc -o a -fmudflap -x c - -lmudflap + $ ./a + ******* + mudflap violation 1 (check/write): time=1227208721.922064 ptr=0x1023de0 size=4 + pc=0x1037a33 location=`:1:26 (main)' + /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33] + ./a(main+0x7c) [0x80486c4] + /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239] + Nearby object 1: checked region begins 68B before and ends 65B before + mudflap object 0x80ca268: name=`argv[]' + bounds=[0x1023e24,0x1023e2b] size=8 area=static check=0r/0w liveness=0 + alloc time=1227208721.922064 pc=0x10371d3 + Nearby object 2: checked region begins 76B before and ends 73B before + mudflap object 0x80cb448: name=`environ[]' + bounds=[0x1023e2c,0x1023ed7] size=172 area=static check=0r/0w liveness=0 + alloc time=1227208721.922064 pc=0x10371d3 + number of nearby objects: 2 + ******* + mudflap violation 2 (check/read): time=1227208721.942109 ptr=0x1023dcc size=4 + pc=0x1037a33 location=`:1:35 (main)' + /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33] + ./a(main+0xf3) [0x804873b] + /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239] + Nearby object 1: checked region begins 88B before and ends 85B before + mudflap object 0x80ca268: name=`argv[]' + Nearby object 2: checked region begins 96B before and ends 93B before + mudflap object 0x80cb448: name=`environ[]' + number of nearby objects: 2 + +Multi-threaded use doesn't: + + $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩ + gcc -include pthread.h -o a -fmudflapth -x c - -lmudflapth -lpthread + $ ./a + Killed + $ gdb a + [...] + Starting program: /media/data/home/tschwinge/a + + Program received signal EXC_BAD_ACCESS, Could not access memory. + 0x01180653 in getenv () from /lib/libc.so.0.3 + (gdb) bt + #0 0x01180653 in getenv () from /lib/libc.so.0.3 + #1 0x01177a02 in __dcigettext () from /lib/libc.so.0.3 + #2 0x01176a57 in dcgettext () from /lib/libc.so.0.3 + #3 0x011c03b5 in strerror_r () from /lib/libc.so.0.3 + #4 0x01175b57 in __assert_perror_fail () from /lib/libc.so.0.3 + #5 0x0111f1ad in cthread_fork (func=0x114f630 <_hurd_msgport_receive>, arg=0x0) + at /build/buildd/hurd-20080607/build-tree/hurd/libpthread/pthread/cthreads-compat.c:41 + #6 0x0115713e in _hurdsig_init () from /lib/libc.so.0.3 + #7 0x01140852 in _hurd_proc_init@@GLIBC_2.2.6 () from /lib/libc.so.0.3 + #8 0x01140e86 in _hurd_init () from /lib/libc.so.0.3 + #9 0x011690ce in init1 () from /lib/libc.so.0.3 + #10 0x00001e96 in _dl_start_user () from /lib/ld.so + #11 0x00000001 in ?? () + #12 0x01024000 in ?? () + #13 0x00000000 in ?? () + +Also `libmudflap` is pthread-only. -- cgit v1.2.3