Date: Sun, 21 Jun 2015 22:31:01 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 201026] rtld-elf reaches divide-by-zero in symlook_obj on 11.0-CURRENT Message-ID: <bug-201026-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201026 Bug ID: 201026 Summary: rtld-elf reaches divide-by-zero in symlook_obj on 11.0-CURRENT Product: Base System Version: 11.0-CURRENT Hardware: sparc64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: gmbroome@vcu.edu Created attachment 157958 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=157958&action=edit Arguments passed to symlook_obj Offending line in libexec/rtld-elf/rtld.c: 4143 bucket = obj->buckets_gnu[req->hash_gnu % obj->nbuckets_gnu]; As we're doing a modulo, there seems to be an assumption that obj->nbuckets_gnu is non-zero by the time that we get here. I've run into at least one case where it is zero, triggering a SIGFPE. Running on world and kernel from SVN (r284174) on 11.0-CURRENT sparc64. Model is a Blade 2000 using 2 x USIIICu 1.2GHz. Kernel, world, and indeed entire stack of ports in this case were built with completely empty make.conf; no -O flags or such. The div-by-zero on the above mentioned line is triggered (at least) any time that Xorg attempts to load /usr/local/lib/libfontenc.so.1 from x11-fonts/libfontenc. Expected results: Xorg displays the launched application Actual results: Xorg exits with a SIGFPE N.B. Utilizing libfontenc.so.1 in my own 'dummy' test application results in the same signal, suggesting that this is a linker issue (or possibly a fontenc issue) rather than an Xorg one; Xorg was just first the manifestation here. Backtrace: #0 0x00000000403cc9d8 in symlook_obj (req=0x7fdffffe920, obj=0x403f1c00) at rtld.c:4143 #1 0x00000000403ccb28 in symlook_list (req=0x7fdffffea20, objlist=<value optimized out>, dlp=0x7fdffffec70) at rtld.c:3860 #2 0x00000000403ccd80 in symlook_global (req=0x7fdffffed40, donelist=0x7fdffffec70) at rtld.c:3758 #3 0x00000000403cd204 in symlook_default (req=0x7fdffffed40, refobj=0x403e7000) at rtld.c:3811 #4 0x00000000403cd4a8 in find_symdef (symnum=26, refobj=0x403e7000, defobj_out=0x7fdffffee78, flags=1, cache=0x0, lockstate=0x7fdffffee40) at rtld.c:1592 #5 0x00000000403cdb1c in _rtld_bind (obj=0x403e7000, reloff=1872) at rtld.c:713 #6 0x00000000403c60a0 in _rtld_bind_start_1 () at /usr/src/libexec/rtld-elf/sparc64/rtld_start.S:166 Attached items: "obj" and "req", as passed to symlook_obj, and my binary of libfontenc.so.1 -- You are receiving this mail because: You are the assignee for the bug.
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