Package: src:glibc Version: 2.22-1 Severity: important User: debian-bsd@lists.debian.org Usertags: kfreebsd X-Debbugs-Cc: debian-bsd@lists.debian.org Hi, glibc/2.22 has a major problem on kfreebsd-i386. It built on the buildds, but the compiled ld-2.22.so is broken as seen on buildd finzi: https://buildd.debian.org/status/fetch.php?pkg=mksh&arch=kfreebsd-i386&ver=52c-1&stamp=1457437296 | dpkg: error processing archive /var/cache/apt/archives/libc-bin_2.22-1_kfreebsd-i386.deb (--unpack): | subprocess dpkg-deb --control was killed by signal (Illegal instruction) | Errors were encountered while processing: | /var/cache/apt/archives/libc-bin_2.22-1_kfreebsd-i386.deb Upgrading libc0.1 breaks pretty much everything: | Core was generated by `ld-2.22.so'. | Program terminated with signal 4, Illegal instruction. | (gdb) bt full | #0 0x0100622b in ?? () | No symbol table info available. | #1 0x62696c2f in ?? () | No symbol table info available. | #2 0x3833692f in ?? () | No symbol table info available. | #3 0x666b2d36 in ?? () | No symbol table info available. | #4 0x01001a90 in ?? () | No symbol table info available. | #5 0x00000000 in ?? () | No symbol table info available. That corresponds to the 'ud2' instruction in the disassembly below: | /* The stack is presently not executable, but this module | requires that it be executable. We must change the | protection of the variable which contains the flags used in | the mprotect calls. */ |#ifdef SHARED | if ((mode & (__RTLD_DLOPEN | __RTLD_AUDIT)) == __RTLD_DLOPEN) | 51fc: 8b 45 14 mov 0x14(%ebp),%eax | 51ff: 25 00 00 00 88 and $0x88000000,%eax | 5204: 3d 00 00 00 80 cmp $0x80000000,%eax | 5209: 0f 84 b9 01 00 00 je 53c8 <_dl_map_object_from_fd+0x1258> | } | __stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC; | __mprotect ((void *) p, s, PROT_READ); | } | else | __stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC; | 520f: 8b 85 70 ff ff ff mov -0x90(%ebp),%eax | 5215: 83 88 1c ff ff ff 07 orl $0x7,-0xe4(%eax) | 521c: e8 af 2e 01 00 call 180d0 <__x86.get_pc_thunk.cx> | 5221: 81 c1 df cd 01 00 add $0x1cddf,%ecx | 5227: 29 d9 sub %ebx,%ecx | 5229: 74 02 je 522d <_dl_map_object_from_fd+0x10bd> | 522b: 0f 0b ud2 | |#ifdef check_consistency | check_consistency (); |#endif | | errval = (*GL(dl_make_stack_executable_hook)) (stack_endp); | 522d: 8b 8d 70 ff ff ff mov -0x90(%ebp),%ecx kFreeBSD 10 disallows executable stacks by default. It can be allowed again by sysctl kern.elf32.nxstack=0, but it would be better if glibc didn't need this. I wonder why this issue wasn't seen on kfreebsd-amd64 since executable stacks are not allowed there either. Thanks. -- System Information: Debian Release: jessie/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: kfreebsd-i386 (i386) Kernel: kFreeBSD 10.1-0-amd64 Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: sysvinit (via /sbin/init)
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