[Bug c++/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78651 --- Comment #5 from chefmax at gcc dot gnu.org --- Created attachment 43652 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43652=edit Untested fix Simple untested fix that seems to cure the issue.
[Bug c++/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78651 chefmax at gcc dot gnu.org changed: What|Removed |Added CC||chefmax at gcc dot gnu.org --- Comment #4 from chefmax at gcc dot gnu.org --- Hm, it seems that ASan is breaking internal ABI between GCC and libstdc++ by adding redzones to global .LDFCM* symbols: $ ~/install/master/bin/g++ /tmp/throws.cc -fsanitize=address -fPIC -S -o bad.s ... .LLSDACSE1: .byte 0x2 .byte 0 .byte 0x1 .byte 0x7d .align 4 .long DW.ref._ZTI1A-. .long .LDFCM0-. .LLSDATT1: ... ... ... .LDFCM0: .zero 56 <== inserted by ASan .quad _ZTIN12_GLOBAL__N_114SomeRandomTypeE .hidden DW.ref.__gxx_personality_v0 .weak DW.ref.__gxx_personality_v0 .section .data.DW.ref.__gxx_personality_v0,"awG",@progbits,DW.ref.__gxx_personality_v0,comdat .align 8 .type DW.ref.__gxx_personality_v0, @object .size DW.ref.__gxx_personality_v0, 8 AFAU, during exception handling, libstdc++ tries to obtain a pointer to `typeinfo for (anonymous namespace)::SomeRandomType' from a constant offset from `.LDFCM0' label and gets zero, because ASan added a right redzone. I suspect that not sanitizing `.LDFCM*' variables (and probably all other debug vars) should resolve the issue.
[Bug c++/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78651
Jonathan Wakely changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed||2018-03-02
Ever confirmed|0 |1
--- Comment #3 from Jonathan Wakely ---
Confirmed:
struct A { };
namespace {
void thisThrows() {
throw A();
}
struct SomeRandomType {};
}
int main() {
try {
thisThrows();
}
catch(SomeRandomType) {
throw;
}
catch(A) {
}
}
$ g++ throws.cc && ./a.out
$ g++ throws.cc -fPIC && ./a.out
$ g++ throws.cc -fsanitize=address && ./a.out
$ g++ throws.cc -fsanitize=address -fPIC && ./a.out
terminate called after throwing an instance of 'A'
Aborted (core dumped)
[Bug c++/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78651 Jonathan Wakely changed: What|Removed |Added CC||mikezackles at gmail dot com --- Comment #2 from Jonathan Wakely --- *** Bug 84657 has been marked as a duplicate of this bug. ***
[Bug c++/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78651 --- Comment #1 from dyp-cpp at gmx dot net --- Same issue if the LocalException is a non-local class with internal linkage.
