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authorDave Hansen <dave.hansen@linux.intel.com>2022-10-03 23:23:46 +0300
committerDave Hansen <dave.hansen@linux.intel.com>2022-10-04 22:53:52 +0300
commitc5129ecc12a3101555d8922b1e0aa90f91247ab6 (patch)
treee34c856f6309202ccb083abd7c24bdd7d147dc58 /mm
parent8c4934f4754057e3577bb1536c6ecc0efa2c966e (diff)
downloadlinux-c5129ecc12a3101555d8922b1e0aa90f91247ab6.tar.xz
x86/mm: Ease W^X enforcement back to just a warning
Currently, the "change_page_attr" (CPA) code refuses to create W+X mappings on 64-bit kernels. There have been reports both from 32-bit[1] and from BPF[2] users where this change kept the system from booting. These reports are showing up even after about a month of soak time in -next. To avoid breaking anything, never enforce W^X. Always warn and return the requested permissions even if a problem is detected. 1. https://lore.kernel.org/all/CAMj1kXHcF_iK_g0OZSkSv56Wmr=eQGQwNstcNjLEfS=mm7a06w@mail.gmail.com/ 2. https://lore.kernel.org/bpf/c84cc27c1a5031a003039748c3c099732a718aec.camel@kernel.org/T/#u Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: x86@kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Peter Zijlstra <peterz@infradead.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions