Thread (9 messages) 9 messages, 5 authors, 2021-12-10

Re: [PATCH v8 05/14] x86: conditionally place regular ASM functions into separate sections

From: Alexander Lobakin <hidden>
Date: 2021-12-03 14:11:30
Also in: linux-arch, linux-hardening, live-patching, lkml, llvm

From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 3 Dec 2021 10:44:10 +0100
On Thu, Dec 02, 2021 at 11:32:05PM +0100, Alexander Lobakin wrote:
quoted
Use the newly introduces macros to create unique separate sections
for (almost) every "regular" ASM function (i.e. for those which
aren't explicitly put into a specific one).
There should be no leftovers as input .text will be size-asserted
in the LD script generated for FG-KASLR.
*groan*...

Please, can't we do something like:

#define SYM_PUSH_SECTION(name)	\
.if section == .text		\
.push_section .text.##name	\
.else				\
.push_section .text		\
.endif

#define SYM_POP_SECTION()	\
.pop_section

and wrap that inside the existing SYM_FUNC_START*() SYM_FUNC_END()
macros.
Ah I see. I asked about this in my previous mail and you replied
already (: Cool stuff, I'll use it, it simplifies things a lot.

Thanks!
Al
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