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| author |  Dave Hansen <dave.hansen@linux.intel.com>
| 2022-09-23 14:29:45 -0700 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com>
| 2022-10-03 13:12:23 -0700 |
| commit | 8c4934f4754057e3577bb1536c6ecc0efa2c966e (patch) | |
| tree | 82c2afe994803355b0ac3a0dad7df44f880779b9 /mm/vmscan.c | |
| parent | x86/mm: Add prot_sethuge() helper to abstract out _PAGE_PSE handling (diff) | |
| download | linux-8c4934f4754057e3577bb1536c6ecc0efa2c966e.tar.gz linux-8c4934f4754057e3577bb1536c6ecc0efa2c966e.tar.bz2 linux-8c4934f4754057e3577bb1536c6ecc0efa2c966e.zip | |
x86/mm: Disable W^X detection and enforcement on 32-bit
The 32-bit code is in a weird spot. Some 32-bit builds (non-PAE) do not
even have NX support. Even PAE builds that support NX have to contend
with things like EFI data and code mixed in the same pages where W+X
is unavoidable.
The folks still running X86_32=y kernels are unlikely to care much about
NX. That combined with the fundamental inability fix _all_ of the W+X
things means this code had little value on X86_32=y. Disable the checks.
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Andy Shevchenko <andy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: linux-efi@vger.kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/all/CAMj1kXHcF_iK_g0OZSkSv56Wmr=eQGQwNstcNjLEfS=mm7a06w@mail.gmail.com/
Diffstat (limited to 'mm/vmscan.c')
0 files changed, 0 insertions, 0 deletions