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Message-ID: <87ft5p2naf.fsf@oldenburg2.str.redhat.com>
Date: Wed, 04 Nov 2020 15:45:44 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Szabolcs Nagy <szabolcs.nagy@....com>, Jeremy Linton
<jeremy.linton@....com>, Mark Brown <broonie@...nel.org>,
libc-alpha@...rceware.org, Mark Rutland <mark.rutland@....com>, Will
Deacon <will@...nel.org>, Kees Cook <keescook@...omium.org>, Salvatore
Mesoraca <s.mesoraca16@...il.com>, Lennart Poettering
<mzxreary@...inter.de>, Topi Miettinen <toiwoton@...il.com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kernel-hardening@...ts.openwall.com, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/4] aarch64: avoid mprotect(PROT_BTI|PROT_EXEC) [BZ
#26831]
* Catalin Marinas:
> Can the dynamic loader mmap() the main exe again while munmap'ing the
> original one? (sorry if it was already discussed)
No, we don't have a descriptor for that. /proc may not be mounted, and
using the path stored there has a race condition anyway.
Thanks,
Florian
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