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Date: Tue, 3 Nov 2020 10:25:37 +0000
From: Szabolcs Nagy <szabolcs.nagy@....com>
To: libc-alpha@...rceware.org
Cc: Jeremy Linton <jeremy.linton@....com>,
Catalin Marinas <catalin.marinas@....com>,
Mark Rutland <mark.rutland@....com>,
Will Deacon <will.deacon@....com>,
Mark Brown <broonie@...nel.org>,
Florian Weimer <fweimer@...hat.com>,
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: [PATCH 0/4] aarch64: avoid mprotect(PROT_BTI|PROT_EXEC) [BZ #26831]
Re-mmap executable segments instead of mprotecting them in
case mprotect is seccomp filtered.
For the kernel mapped main executable we don't have the fd
for re-mmap so linux needs to be updated to add BTI. (In the
presence of seccomp filters for mprotect(PROT_EXEC) the libc
cannot change BTI protection at runtime based on user space
policy so it is better if the kernel maps BTI compatible
binaries with PROT_BTI by default.)
Szabolcs Nagy (4):
elf: Pass the fd to note processing [BZ #26831]
elf: Move note processing after l_phdr is updated [BZ #26831]
aarch64: Use mmap to add PROT_BTI instead of mprotect [BZ #26831]
aarch64: Remove the bti link_map field [BZ #26831]
elf/dl-load.c | 38 ++++++++++++++++---------------
elf/rtld.c | 4 ++--
sysdeps/aarch64/dl-bti.c | 46 ++++++++++++++++++++------------------
sysdeps/aarch64/dl-prop.h | 17 +++++++-------
sysdeps/aarch64/linkmap.h | 1 -
sysdeps/generic/dl-prop.h | 6 ++---
sysdeps/generic/ldsodefs.h | 5 +++--
sysdeps/x86/dl-prop.h | 6 ++---
8 files changed, 64 insertions(+), 59 deletions(-)
--
2.17.1
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