[bug] asan + arm64 + shared libc++.so + -fuse_ld=lld + exceptions #988
Description
NDK 20-beta3
ABI arm64
ANDROID 8.1
I got a crash duringsanitizing application on armv64 when exception is thrown
I have build with -fuse-ld=lld which works perfectly for standard release application as i link staticaly to libc++
But when building sanitized application with wrap.sh i have to use shared libc++ and i found that it is linked to libgcc. As I remeber this will not work and i wll have crash on parsing eh frames, as I have. This problem doesn't exists in x86 code.
The last address in libc++ points to unwind from libgcc
llvm-symbolizer -demangle -addresses -inlining -pretty-print -functions=short -color -e aAM-libs/asan_dev/arm64-v8a/lc++_shared.so 0xb8f7c
0xb8f7c: _Unwind_SetGR at /usr/local/google/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/libgcc/unwind-dw2.c:275:0
And now I'm wondering where is problem in libc++ linked against libgcc instead of llvm/libclang_rt or something or in my build configuration
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
LineageOS Version: '15.1-20190412-NIGHTLY-santoni'
Build fingerprint: 'Xiaomi/santoni/santoni:7.1.2/N2G47H/V9.2.1.0.NAMCNEK:user/release-keys'
Revision: '0'
ABI: 'arm64'
pid: 27755, tid: 27857, name: Map >>> pl.aqurat.automapa.dev <<<
signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
x0 0000000000000000 x1 0000000000006cd1 x2 0000000000000006 x3 0000000000000008
x4 feff026ef0949b0a x5 feff026ef0949b0a x6 feff026ef0949b0a x7 7f7f7f7fffffff7f
x8 0000000000000083 x9 2adfd3b160362759 x10 0000001000000000 x11 0000000000000001
x12 ffffffffffffffff x13 000000000000000e x14 0000000000000700 x15 0000000000000000
x16 0000005943c72fa8 x17 000000791f0eb00c x18 00000000787a5158 x19 0000000000006c6b
x20 0000000000006cd1 x21 434c4e47432b2b00 x22 0000000000000000 x23 00000078443fc588
x24 0000000000000000 x25 0000001f0875d2c0 x26 0000007843ae96a0 x27 0000007843ae9600
x28 0000007843ae9660 x29 00000078443f8700 x30 000000791f09fa34
sp 00000078443f86c0 pc 000000791f09fa50 pstate 0000000060000000
derer: Initialized EGL, version 1.4
derer: Swap behavior 2
backtrace:
#00 pc 000000000001da50 /system/lib64/libc.so (abort+104)
#01 pc 00000000000b8f7c /data/app/pl.aqurat.automapa.dev-VjYgEvoSwPZYI_d1drJDww==/lib/arm64/libc++_shared.so
#02 pc 00000000000b5324 /data/app/pl.aqurat.automapa.dev-VjYgEvoSwPZYI_d1drJDww==/lib/arm64/libc++_shared.so (__gxx_pers
#03 pc 00000000000da550 /data/app/pl.aqurat.automapa.dev-VjYgEvoSwPZYI_d1drJDww==/lib/arm64/libclang_rt.asan-aarch64-and
#04 pc 00000000000da874 /data/app/pl.aqurat.automapa.dev-VjYgEvoSwPZYI_d1drJDww==/lib/arm64/libclang_rt.asan-aarch64-and
#05 pc 0000000000069ad4 /system/lib64/libc++.so (__cxa_throw+112)
......
stripped important flags from final linking
--target=aarch64-none-linux-android27 --gcc-toolchain=/opt/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64 --sysroot=/opt/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fno-stack-protector -no-canonical-prefixes -fno-addrsig -fPIC -std=gnu++17 -ggdb -Ofast3 -stdlib=libc++ -Wl,--no-undefined -fvisibility=default -fsigned-char -fintegrated-as -ftemplate-depth=1024 -fno-data-sections -fno-function-sections -fno-omit-frame-pointer -fsanitize=address -fsanitize-address-use-after-scope -fno-optimize-sibling-calls -fsanitize=alignment,bool,builtin,bounds,enum,float-cast-overflow,float-divide-by-zero,implicit-unsigned-integer-truncation,implicit-signed-integer-truncation,implicit-integer-sign-change,integer-divide-by-zero,nonnull-attribute,null,nullability-arg,nullability-assign,nullability-return,object-size,pointer-overflow,return,returns-nonnull-attribute,shift,signed-integer-overflow,unreachable,unsigned-integer-overflow,vla-bound -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack -fuse-ld=lld -Wl,--build-id -shared -Wl,-soname,lib_mylib****_.so
And i don't understand that __cxa_throw is called from system wide libc++.so as I linked library against libc++_shared.so and it is attached with appliation and is used on aprsing eh frames.
#02 pc .../lib/arm64/libc++_shared.so (__gxx_pers
#05 /system/lib64/libc++.so (__cxa_throw+112)