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SubjectRe: [PATCH 0/4] arm64: wire up VM_FLUSH_RESET_PERMS
On Thu, May 23, 2019 at 11:22:52AM +0100, Ard Biesheuvel wrote:
> Wire up the code introduced in v5.2 to manage the permissions
> of executable vmalloc regions (and their linear aliases) more
> strictly.
>
> One of the things that came up in the internal discussion is
> whether non-x86 architectures have any benefit at all from the
> lazy vunmap feature, and whether it would perhaps be better to
> implement eager vunmap instead.
>
> Cc: Nadav Amit <namit@vmware.com>
> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: James Morse <james.morse@arm.com>
>
> Ard Biesheuvel (4):
> arm64: module: create module allocations without exec permissions
> arm64/mm: wire up CONFIG_ARCH_HAS_SET_DIRECT_MAP
> arm64/kprobes: set VM_FLUSH_RESET_PERMS on kprobe instruction pages
> arm64: bpf: do not allocate executable memory
>
> arch/arm64/Kconfig | 1 +
> arch/arm64/include/asm/cacheflush.h | 3 ++
> arch/arm64/kernel/module.c | 4 +-
> arch/arm64/kernel/probes/kprobes.c | 4 +-
> arch/arm64/mm/pageattr.c | 48 ++++++++++++++++----
> arch/arm64/net/bpf_jit_comp.c | 2 +-
> mm/vmalloc.c | 11 -----
> 7 files changed, 50 insertions(+), 23 deletions(-)

Thanks, this all looks good to me. I can get pick this up for 5.2 if
Rick's fixes [1] land soon enough.

Cheers,

Will

[1] https://lore.kernel.org/lkml/20190527211058.2729-1-rick.p.edgecombe@intel.com/T/#u

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