{"id":862,"date":"2016-11-07T18:27:23","date_gmt":"2016-11-07T16:27:23","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=862"},"modified":"2016-12-01T15:56:29","modified_gmt":"2016-12-01T13:56:29","slug":"libdwarf-memory-allocation-failure-in-do_decompress_zlib-dwarf_init_finish-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2016\/11\/07\/libdwarf-memory-allocation-failure-in-do_decompress_zlib-dwarf_init_finish-c\/","title":{"rendered":"libdwarf: memory allocation failure in do_decompress_zlib (dwarf_init_finish.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"https:\/\/www.prevanders.net\/dwarf.html\">libdwarf<\/a> is a library to consume and produce DWARF debug information.<\/p>\n<p>A fuzz on an updated version revealed a memory allocation failure.<\/p>\n<p>The complete ASan output:<\/p>\n<pre><font size=\"2\"># dwarfdump $FILE\r\n==27994==WARNING: AddressSanitizer failed to allocate 0x62696c2f7273752f bytes \r\n==27994==AddressSanitizer's allocator is terminating the process instead of returning 0 \r\n==27994==If you don't like this behavior set allocator_may_return_null=1 \r\n==27994==AddressSanitizer CHECK failed: \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/sanitizer_common\/sanitizer_allocator.cc:147 \"((0)) != (0)\" (0x0, 0x0) \r\n   #0 0x4ca3ed in __asan::AsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/asan\/asan_rtl.cc:67 \r\n   #1 0x4d0f23 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/sanitizer_common\/sanitizer_common.cc:159 \r\n   #2 0x4cec76 in __sanitizer::ReportAllocatorCannotReturnNull() \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/sanitizer_common\/sanitizer_allocator.cc:147 \r\n   #3 0x42204c in __sanitizer::CombinedAllocator&lt;__sanitizer::SizeClassAllocator64&lt;105553116266496ul, 4398046511104ul, 0ul, __sanitizer::SizeClassMap, __asan::AsanMapUnmapCallback&gt;, __sanitizer::SizeClassAllocatorLocalCache&lt;__sanitizer::SizeClassAllocator64&lt;105553116266496ul, 4398046511104ul, 0ul, __sanitizer::SizeClassMap, __asan::AsanMapUnmapCallback&gt; &gt;, __sanitizer::LargeMmapAllocator &gt;::ReturnNullOrDie() \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/asan\/..\/sanitizer_common\/sanitizer_allocator.h:1317 \r\n   #4 0x42204c in __asan::Allocator::Allocate(unsigned long, unsigned long, __sanitizer::BufferedStackTrace*, __asan::AllocType, bool) \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/asan\/asan_allocator.cc:359 \r\n   #5 0x42204c in __asan::asan_malloc(unsigned long, __sanitizer::BufferedStackTrace*) \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/asan\/asan_allocator.cc:718 \r\n   #6 0x4c0ab1 in malloc \/var\/tmp\/portage\/sys-devel\/llvm-3.8.1-r2\/work\/llvm-3.8.1.src\/projects\/compiler-rt\/lib\/asan\/asan_malloc_linux.cc:53 \r\n   #7 0x5b582e in do_decompress_zlib \/tmp\/dwarf-20161021\/libdwarf\/dwarf_init_finish.c:1085:12 \r\n   #8 0x5b582e in _dwarf_load_section \/tmp\/dwarf-20161021\/libdwarf\/dwarf_init_finish.c:1159 \r\n   #9 0x5bb479 in dwarf_srcfiles \/tmp\/dwarf-20161021\/libdwarf\/.\/dwarf_line.c:336:11 \r\n   #10 0x5145cd in print_one_die_section \/tmp\/dwarf-20161021\/dwarfdump\/print_die.c:812:28 \r\n   #11 0x512262 in print_infos \/tmp\/dwarf-20161021\/dwarfdump\/print_die.c:371:16 \r\n   #12 0x4faafa in process_one_file \/tmp\/dwarf-20161021\/dwarfdump\/dwarfdump.c:1371:9 \r\n   #13 0x4faafa in main \/tmp\/dwarf-20161021\/dwarfdump\/dwarfdump.c:654 \r\n   #14 0x7f578f45a61f in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.22-r4\/work\/glibc-2.22\/csu\/libc-start.c:289 \r\n   #15 0x419588 in _start (\/usr\/bin\/dwarfdump-asan+0x419588)\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n20161021<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\n20161124<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"https:\/\/sourceforge.net\/p\/libdwarf\/code\/ci\/583f8834083b5ef834c497f5b47797e16101a9a6\/\">https:\/\/sourceforge.net\/p\/libdwarf\/code\/ci\/583f8834083b5ef834c497f5b47797e16101a9a6\/<\/a><\/p>\n<p><strong>Credit:<\/strong><br \/>\nThis bug was discovered by Agostino Sarubbo of Gentoo.<\/p>\n<p><strong>CVE:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00024-libdwarf-memalloc-do_decompress_zlib\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00024-libdwarf-memalloc-do_decompress_zlib<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2016-11-02: bug discovered and reported to upstream<br \/>\n2016-11-05: upstream released a patch<br \/>\n2016-11-07: blog post about the issue<br \/>\n2016-11-24: upstream released 20161124<\/p>\n<p><strong>Note:<\/strong><br \/>\nThis bug was found with <a href=\"http:\/\/lcamtuf.coredump.cx\/afl\">American Fuzzy Lop<\/a>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"qQLhC8LoQf\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2016\/11\/07\/libdwarf-memory-allocation-failure-in-do_decompress_zlib-dwarf_init_finish-c\/\">libdwarf: memory allocation failure in do_decompress_zlib (dwarf_init_finish.c)<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/blogs.gentoo.org\/ago\/2016\/11\/07\/libdwarf-memory-allocation-failure-in-do_decompress_zlib-dwarf_init_finish-c\/embed\/#?secret=qQLhC8LoQf\" data-secret=\"qQLhC8LoQf\" width=\"600\" height=\"338\" title=\"&#8220;libdwarf: memory allocation failure in do_decompress_zlib (dwarf_init_finish.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: libdwarf is a library to consume and produce DWARF debug information. A fuzz on an updated version revealed a memory allocation failure. The complete ASan output: # dwarfdump $FILE ==27994==WARNING: AddressSanitizer failed to allocate 0x62696c2f7273752f bytes ==27994==AddressSanitizer&#8217;s allocator is &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2016\/11\/07\/libdwarf-memory-allocation-failure-in-do_decompress_zlib-dwarf_init_finish-c\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":140,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[12,10],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2EaBc-dU","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/862"}],"collection":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/users\/140"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/comments?post=862"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/862\/revisions"}],"predecessor-version":[{"id":1002,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/862\/revisions\/1002"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}