Re: [PATCH v2 0/1] binfmt_elf: seal address zero

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On Tue, 06 Aug 2024 21:49:26 +0000, jeffxu@xxxxxxxxxxxx wrote:
> From: Jeff Xu <jeffxu@xxxxxxxxxxxx>
> 
> In load_elf_binary as part of the execve(),  when the current
> task’s personality has MMAP_PAGE_ZERO set, the kernel allocates
> one page at address 0. According to the comment:
> 
> /* Why this, you ask???  Well SVr4 maps page 0 as read-only,
>     and some applications "depend" upon this behavior.
>     Since we do not have the power to recompile these, we
>      emulate the SVr4 behavior. Sigh. */
> 
> [...]

I added the cover letter details to the commit log and changed pr_warn()
to pr_warn_ratelimited(), but otherwise, looked good.

Applied to for-next/execve, thanks!

[1/1] binfmt_elf: mseal address zero
      https://git.kernel.org/kees/c/44f65d900698

Take care,

-- 
Kees Cook





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