From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 20 Jan 2001 22:19:08 +0100 From: Olaf Hering To: linuxppc-dev@lists.linuxppc.org Subject: mprotect broken on ppc Message-ID: <20010120221908.A20689@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Hi, there seems to be a bug in mprotect which was introduced in test9->test10. The result is an invalid pointer from the getpwuid(3) function, this function is used in rpm to check owner and group permissions. Just an example: bad, su(1) is called with "-" to read the profile and make a login shell: ... lemon:~/lsof # chroot /abuild/buildsystem.lemon.broken_build/ su -c "rpm -ba /usr/src/packages/SOURCES/lsof.spec" - < /dev/null getUname(): pw = 0 , uid = 0 parsePrep Bad owner/group: /usr/src/packages/SOURCES/lsof_4.52.tar.bz2 ... this works on all other archs. same as above, rpm is a symlink to rpm.sh which reads the /etc/profile in the chroot: .... lemon:~/lsof # chroot /abuild/buildsystem.lemon.broken_build/ su -c "/bin/rpm.sh -ba /usr/src/packages/SOURCES/lsof.spec" - < /dev/null getUname(): pw = 0 , uid = 0 parsePrep Bad owner/group: /usr/src/packages/SOURCES/lsof_4.52.tar.bz2 ... if I call the rpm binary directly it works as expected: .... lemon:~/lsof # chroot /abuild/buildsystem.lemon.broken_build/ su -c "/bin/rpm.bin -ba /usr/src/packages/SOURCES/lsof.spec" - < /dev/null getUname(): pw = 1925cb8 , uid = 0 Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.83927 + umask 022 + cd /usr/src/packages/BUILD + cd /usr/src/packages/BUILD + rm -rf lsof_4.52 ... pw in rpm/build/names:getUname() returns something. Here is the strace output from the failed build: .... 3902 open("/etc/ld.so.cache", O_RDONLY) = 5 3902 fstat(5, {st_mode=S_IFREG|0644, st_size=10630, ...}) = 0 3902 mmap(NULL, 10630, PROT_READ, MAP_PRIVATE, 5, 0) = 0x30002000 3902 close(5) = 0 3902 open("/lib/libnss_compat.so.2", O_RDONLY) = 5 3902 read(5, "\177ELF\1\2\1\0\0\0\0\0\0\0\0\0\0\3\0\24\0\0\0\1\0\0\034"..., 1024) = 1024 3902 fstat(5, {st_mode=S_IFREG|0755, st_size=57990, ...}) = 0 3902 brk(0x1938370) = 0x1938370 3902 mmap(0x6ffd4450, 113580, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 5, 0) = 0x6ffd5000 3902 mprotect(0x6ffdffb0, 68604, PROT_NONE) = -1 EINVAL (Invalid argument) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 3902 mmap(0x6ffe5000, 47264, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 5, 0) = 0x6ffe5000 3902 mmap(0x6fff08a0, 780, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = -1 EINVAL (Inval 3902 close(5) = 0 3902 munmap(0x30002000, 10630) = 0 3902 write(2, "Bad owner/group: /usr/src/packag"..., 60) = 60 3902 write(2, "\n", 1) = 1 3902 open("/usr/lib/rpm/rpmrc", O_RDONLY) = 5 ..... The same mprotect works with test9. It doesnt matter what .config I use or if highmem is on. It happens on all machines with 2.4.0-test10 and newer kernels. The diff between these two kernels show many changes in the memory system, so I guess something went wrong for ppc. The files, strace output and such can be found at http://penguinppc.org/~olaf/broken_build/ Any ideas how to fix that? Or what might be wrong here? Gruss Olaf -- $ man clone BUGS Main feature not yet implemented... ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/