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Groups > linux.kernel > #1285996
| From | Kees Cook <keescook@chromium.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] ARM: mm: mark section-aligned portion of rodata NX |
| Date | 2015-12-07 23:00 +0100 |
| Message-ID | <qDbZa-1Mo-73@gated-at.bofh.it> (permalink) |
| References | <qDb34-14n-11@gated-at.bofh.it> <qDbZa-1Mo-59@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Dec 7, 2015 at 1:52 PM, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote: > On 7 December 2015 at 21:54, Kees Cook <keescook@chromium.org> wrote: >> When rodata is large enough that it crosses a section boundary after the >> kernel text, mark the rest NX. This is as close to full NX of rodata as >> we can get without splitting page tables or doing section alignment via >> CONFIG_DEBUG_ALIGN_RODATA. >> >> Signed-off-by: Kees Cook <keescook@chromium.org> >> --- >> I am baffled why I can't put the ALIGN in the ".start = " initializer. >> GCC seems to think it's non-static, but only because of the "&" operator. >> Does anyone see a way to do this that doesn't require the runtime ALIGN? > > Yes, but you need to move the ALIGN() expression to the linker script > as the value of a new symbol I didn't see a way to do this without actually bumping the alignment (CONFIG_DEBUG_ALIGN_RODATA already does that, I want the other case). Do you have an example anywhere I could look at? -Kees -- Kees Cook Chrome OS & Brillo Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH] ARM: mm: mark section-aligned portion of rodata NX Kees Cook <keescook@chromium.org> - 2015-12-07 22:00 +0100
Re: [PATCH] ARM: mm: mark section-aligned portion of rodata NX Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-12-07 23:00 +0100
Re: [PATCH] ARM: mm: mark section-aligned portion of rodata NX Kees Cook <keescook@chromium.org> - 2015-12-07 23:00 +0100
Re: [PATCH] ARM: mm: mark section-aligned portion of rodata NX Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-12-07 23:20 +0100
Re: [PATCH] ARM: mm: mark section-aligned portion of rodata NX Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-12-07 23:20 +0100
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