When searching for native extensions, if the name does not end in ".so"
then we create a new string and append ".so" so it. If the native extension
is in static_ext_inits, then we could trigger a GC in the rb_filesystem_str_new_cstr.
This could cuase the GC to free lookup_name since we don't use the local
variable anymore.
==435614==ERROR: AddressSanitizer: use-after-poison on address 0x715a63022da0 at pc 0x5e7463873e4e bp 0x7fff383c8b00 sp 0x7fff383c82c0
READ of size 14 at 0x715a63022da0 thread T0
#0 0x5e7463873e4d in __asan_memcpy (/tmp/ruby/build/trunk_asan/ruby+0x214e4d) (BuildId: 607411c0626a2f66b4c20c02179b346aace20898)
#1 0x5e7463b50a82 in memcpy /usr/include/x86_64-linux-gnu/bits/string_fortified.h:29:10
#2 0x5e7463b50a82 in ruby_nonempty_memcpy /tmp/ruby/src/trunk_asan/include/ruby/internal/memory.h:671:16
#3 0x5e7463b50a82 in str_enc_new /tmp/ruby/src/trunk_asan/string.c:1035:9
#4 0x5e74639b97dd in search_required /tmp/ruby/src/trunk_asan/load.c:1126:21
#5 0x5e74639b97dd in require_internal /tmp/ruby/src/trunk_asan/load.c:1274:17
#6 0x5e74639b83c1 in rb_require_string_internal /tmp/ruby/src/trunk_asan/load.c:1401:22
#7 0x5e74639b83c1 in rb_require_string /tmp/ruby/src/trunk_asan/load.c:1387:12
Added by
GC guard lookup_name
When searching for native extensions, if the name does not end in ".so"
then we create a new string and append ".so" so it. If the native extension
is in static_ext_inits, then we could trigger a GC in the rb_filesystem_str_new_cstr.
This could cuase the GC to free lookup_name since we don't use the local
variable anymore.
This bug was caught in this ASAN build:
http://ci.rvm.jp/results/trunk_asan@ruby-sp1/5479182