-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Alf mel on 9/15/2007 8:26 AM: > While trying out the lastest offerings in Glibc (2.6.1) and GCC (4.2.1) via > the DIY-Linux project (www.diy-linux-.org), I encountered the following > error in the configure script when compiled with > > CFLAGS="-O2 -fstack-protector -D_FORTIFY_SOURCE=2".
Thanks for the report. This might be a bug in Bruno's code for checking the characteristics of the system printf, so I'm forwarding it to the gnulib list for him to comment on. > > Here is what I get: > > checking whether printf supports size specifiers as in C99... yes > checking whether printf supports 'long double' arguments... yes > checking whether printf supports infinite 'double' arguments... yes > checking whether printf supports infinite 'long double' arguments... *** > buffer overflow detected ***: ./conftest terminated > ======= Backtrace: ========= > /lib/libc.so.6(__chk_fail+0x41)[0xb7ed4191] > /lib/libc.so.6[0xb7ed3998] > /lib/libc.so.6(_IO_default_xsputn+0xb7)[0xb7e53d47] > /lib/libc.so.6(__printf_fp+0x6a9)[0xb7e30559] > /lib/libc.so.6(_IO_vfprintf+0x3c7)[0xb7e2b877] > /lib/libc.so.6(__vsprintf_chk+0xad)[0xb7ed3a4d] > /lib/libc.so.6(__sprintf_chk+0x30)[0xb7ed3980] > ./conftest[0x8048d11] > /lib/libc.so.6(__libc_start_main+0xe0)[0xb7e03f90] > ./conftest[0x8048311] > ======= Memory map: ======== > 08048000-0804a000 r-xp 00000000 08:06 > 6295768 /var/local/slim/build/m4/source/m4-1.4.10/conftest > 0804a000-0804b000 rw-p 00001000 08:06 > 6295768 /var/local/slim/build/m4/source/m4-1.4.10/conftest > 0804b000-0806c000 rw-p 0804b000 00:00 0 [heap] > b7de2000-b7dec000 r-xp 00000000 08:01 134 /usr/lib/libgcc_s.so.1 > b7dec000-b7ded000 rw-p 00009000 08:01 134 /usr/lib/libgcc_s.so.1 > b7ded000-b7dee000 rw-p b7ded000 00:00 0 > b7dee000-b7f2d000 r-xp 00000000 08:01 20983511 /lib/libc-2.6.1.so > b7f2d000-b7f2f000 r--p 0013f000 08:01 20983511 /lib/libc-2.6.1.so > b7f2f000-b7f30000 rw-p 00141000 08:01 20983511 /lib/libc-2.6.1.so > b7f30000-b7f34000 rw-p b7f30000 00:00 0 > b7f37000-b7f53000 r-xp 00000000 08:01 20983504 /lib/ld-2.6.1.so > b7f53000-b7f54000 r--p 0001b000 08:01 20983504 /lib/ld-2.6.1.so > b7f54000-b7f55000 rw-p 0001c000 08:01 20983504 /lib/ld-2.6.1.so > bfad6000-bfaec000 rw-p bfad6000 00:00 0 [stack] > ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso] > no > > This problem also occurs when compiling with GCC 4.1.2 and Glibc 2.6.1. It > was also confirmed by Greg Schafer from the DIY-Linux team on this post: > > http://www.diy-linux.org/pipermail/diy-linux-dev/2007-September/001103.html > > The buffer overflow doesn't seem to change the result of the test in our > systems. > > Thanks for your help. > - -- Don't work too hard, make some time for fun as well! Eric Blake [EMAIL PROTECTED] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFG7Ba/84KuGfSFAYARAm6FAKCIvzpYvzzTfC0qpgwVQKQvdNSyyQCfb9Zi 3y6otz7NF45HDm0RyjYH1KA= =Yqcv -----END PGP SIGNATURE-----
