Re: [PATCH 5.10.y/5.15.y] ELF: fix kernel.randomize_va_space double read

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 2a97388a807b6ab5538aa8f8537b2463c6988bd2

WARNING: Author mismatch between patch and upstream commit:
Backport author: Feng Liu<Feng.Liu3@windriver.com>
Commit author: Alexey Dobriyan<adobriyan@gmail.com>

Status in newer kernel trees:
6.14.y | Present (exact SHA1)
6.12.y | Present (exact SHA1)
6.6.y | Present (different SHA1: 53f17409abf6)
6.1.y | Present (different SHA1: 1f81d51141a2)
5.15.y | Not found

Note: The patch differs from the upstream commit:
---
1:  2a97388a807b6 ! 1:  795c22f390cda ELF: fix kernel.randomize_va_space double read
    @@ Metadata
      ## Commit message ##
         ELF: fix kernel.randomize_va_space double read
     
    +    [ Upstream commit 2a97388a807b6ab5538aa8f8537b2463c6988bd2 ]
    +
         ELF loader uses "randomize_va_space" twice. It is sysctl and can change
         at any moment, so 2 loads could see 2 different values in theory with
         unpredictable consequences.
    @@ Commit message
         Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
         Link: https://lore.kernel.org/r/3329905c-7eb8-400a-8f0a-d87cff979b5b@p183
         Signed-off-by: Kees Cook <kees@kernel.org>
    +    Signed-off-by: Feng Liu <Feng.Liu3@windriver.com>
    +    Signed-off-by: He Zhe <Zhe.He@windriver.com>
     
      ## fs/binfmt_elf.c ##
     @@ fs/binfmt_elf.c: static int load_elf_binary(struct linux_binprm *bprm)
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.10.y       |  Success    |  Success   |
| stable/linux-5.15.y       |  Success    |  Success   |