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ELF: fix kernel.randomize_va_space double read
authorAlexey Dobriyan <adobriyan@gmail.com>
Fri, 21 Jun 2024 18:54:50 +0000 (21:54 +0300)
committerKees Cook <kees@kernel.org>
Fri, 21 Jun 2024 19:40:01 +0000 (12:40 -0700)
commit2a97388a807b6ab5538aa8f8537b2463c6988bd2
treed35cca0b7bd050979227c8da15643798da5ac93dtree
parent60371f43e56bfad1f438621fae286e1de5bb6877commit | diff
ELF: fix kernel.randomize_va_space double read

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.

Issue exactly one load for consistent value across one exec.

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>
fs/binfmt_elf.c diff | blob | history
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