linux-hardening - [PATCH 0/4] aarch64: avoid mprotect(PROT_BTI|PROT

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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