Messages in this thread | | | Date | Wed, 11 Mar 2020 20:44:46 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v4 1/6] x86/elf: Add table to document READ_IMPLIES_EXEC |
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Ozenn Mon, Feb 24, 2020 at 09:13:02PM -0800, Kees Cook wrote: > Add a table to document the current behavior of READ_IMPLIES_EXEC in > preparation for changing the behavior. > > Signed-off-by: Kees Cook <keescook@chromium.org> > Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> > --- > arch/x86/include/asm/elf.h | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h > index 69c0f892e310..733f69c2b053 100644 > --- a/arch/x86/include/asm/elf.h > +++ b/arch/x86/include/asm/elf.h > @@ -281,6 +281,25 @@ extern u32 elf_hwcap2; > /* > * An executable for which elf_read_implies_exec() returns TRUE will > * have the READ_IMPLIES_EXEC personality flag set automatically. > + * > + * The decision process for determining the results are: > + * > + * CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 | > + * ELF: | | | | > + * -------------------------------|------------------|----------------| > + * missing GNU_STACK | exec-all | exec-all | exec-all | > + * GNU_STACK == RWX | exec-all | exec-all | exec-all | > + * GNU_STACK == RW | exec-none | exec-none | exec-none |
In all those tables, you wanna do:
s/GNU_STACK/PT_GNU_STACK/g
so that it is clear what this define is.
Thx.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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