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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2022-10-03 13:23:46 -0700 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-10-04 12:53:52 -0700 |
| commit | c5129ecc12a3101555d8922b1e0aa90f91247ab6 (patch) | |
| tree | e34c856f6309202ccb083abd7c24bdd7d147dc58 /fs/mbcache.c | |
| parent | 8c4934f4754057e3577bb1536c6ecc0efa2c966e (diff) | |
| download | linux-c5129ecc12a3101555d8922b1e0aa90f91247ab6.tar.gz linux-c5129ecc12a3101555d8922b1e0aa90f91247ab6.tar.bz2 linux-c5129ecc12a3101555d8922b1e0aa90f91247ab6.zip | |
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 'fs/mbcache.c')
0 files changed, 0 insertions, 0 deletions