Extend user-space ASLR range
Get series with b4
b4 am [email protected]Versions newest first
- v1 Latest0 of 6 patches 0 repliesNew
Patches in v1 No applies recorded yet
None of the 6 patches the cover letter announces are in this archive.
Reviews trailers per patch
No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.
Cover letter [cip-dev] [PATCH 4.4-cip 0/6] Extend user-space ASLR range
Hi,
Quoted 18 lines · Agustin Benito Bethencourt
Hi,
Quoted 15 lines · Ben Hutchings
This is a backport of changes in 4.5 to extend the range of Address Space Layout Randomisation for user-space processes. When enabled, this should make some user-space vulnerabilities harder to exploit, but it can also cause some applications to fail if they currently use a large proportion of the virtual address space.
The default ASLR range remains the same, but it can be changed through kernel config (
CONFIG_ARCH_MMAP_RND_BITS) or at run-time through sysctl (vm.mmap_rnd_bits). (For 32-bit compat tasks, the range is controlled throughCONFIG_ARCH_MMAP_RND_COMPAT_BITSand vm.mmap_rnd_compat_bits.)This includes support for arm, arm64 and x86 (32- and 64-bit). (arm64 is not currently supported by CIP, but it was easier to include it in the backport than to leave it out.)
Quoted 8 lines
Quoted 5 lines
For this and other backports, I'm looking for feedback like:
- Did I miss a follow-up fix or an earlier dependency?
- Does this cause a regression (other than as explained above)?
- Are you likely to use it?
- Are there related features you want in 4.4?since there is no further feedback, I assume you me merge the patches, isn't is?
since there is no further feedback, I assume you will merge the patches, isn't is?
Quoted 37 lines
Hopefully in a couple or three more weeks we can start testing it with kernelci tooling.
Quoted 32 lines
Ben.
Daniel Cashman (6):
mm: mmap: add new /proc tunable formmap_baseASLR
arm: mm: supportARCH_MMAP_RND_BITS
arm64: mm: supportARCH_MMAP_RND_BITS
x86: mm: supportARCH_MMAP_RND_BITS
drivers: char: random: addget_random_long()
mm: ASLR: useget_random_long()Documentation/sysctl/vm.txt | 29 +++++++++++++++++ arch/Kconfig | 68 ++++++++++++++++++++++++++++++++++++++++ arch/arm/Kconfig | 9 ++++++ arch/arm/mm/mmap.c | 3 +- arch/arm64/Kconfig | 29 +++++++++++++++++ arch/arm64/mm/mmap.c | 8 +++-- arch/mips/mm/mmap.c | 4 +-- arch/powerpc/kernel/process.c | 4 +-- arch/powerpc/mm/mmap.c | 4 +-- arch/sparc/kernel/sys_sparc_64.c | 2 +- arch/x86/Kconfig | 16 ++++++++++ arch/x86/mm/mmap.c | 12 +++---- drivers/char/random.c | 22 +++++++++++++ fs/binfmt_elf.c | 2 +- include/linux/mm.h | 11 +++++++ include/linux/random.h | 1 + kernel/sysctl.c | 22 +++++++++++++ mm/mmap.c | 12 +++++++ 18 files changed, 240 insertions(+), 18 deletions(-)
Signature · 3 lines
Agustin Benito Bethencourt Principal Consultant - FOSS at Codethink agustin.benito at codethink.co.uk