Date: Sat, 02 Mar 2019 21:48:06 +0000 From: bugzilla-noreply@freebsd.org To: toolchain@FreeBSD.org Subject: [Bug 236165] crash in malloc with ld.lld and -Wl,--export-dynamic -static Message-ID: <bug-236165-29464-dKbbHEVwSK@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-236165-29464@https.bugs.freebsd.org/bugzilla/> References: <bug-236165-29464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236165 Alex Richardson <arichardson@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |arichardson@FreeBSD.org --- Comment #2 from Alex Richardson <arichardson@FreeBSD.org> --- We also ran into this problem in CheriBSD. The binary is actually static (b= ut file will report it as dynamically linked). However, it has a PT_DYNAMIC he= ader and the symbol _DYNAMIC does not resolve to zero. This causes these crashes because there are various checks in libc, csu code, etc. that assume that `= if (&_DYNAMIC =3D=3D NULL)` is true the binary is statically linked and otherw= ise it assumes we are running a dynamic binary. For our CHERI compilers I just modified ld.lld to not emit _DYNAMIC and the PT_DYNAMIC header. I also attempted to upstream this fix but haven't got ar= ound to committing it since I'm not 100% sure what the correct behaviour is. See also https://reviews.llvm.org/D42748 --=20 You are receiving this mail because: You are the assignee for the bug.=
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