From: Mark Brown <broonie@kernel.org>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
linux-arm-kernel@lists.infradead.org,
live-patching@vger.kernel.org, Song Liu <song@kernel.org>,
Miroslav Benes <mbenes@suse.cz>, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Kees Cook <kees@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
linux-toolchains@vger.kernel.org
Subject: Re: [PATCH 07/12] arm64/bti: Advertise BTI in assembly objects
Date: Sat, 15 Aug 2026 22:53:43 +0100 [thread overview]
Message-ID: <aoDf5x4iicivXsMc@sirena.co.uk> (raw)
In-Reply-To: <5340f3df281bebc81aad3cd9a7471d95061b4b9d.1786768375.git.jpoimboe@kernel.org>
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On Fri, Aug 14, 2026 at 09:45:24PM -0700, Josh Poimboeuf wrote:
> On a kernel whose text exceeds the +/-128MB direct branch range, the
> linker inserts veneers. With BTI enabled, the veneers' indirect branch
> targets need a BTI landing pad, which not all functions have starting
> with Clang 21 (and for all versions of GCC).
We already have explicit note generation support in asm/assembler.h
which is used in the vDSO code, it probably makes sense to replace that
too. I didn't check if there's potential for the two to collide with
this as is.
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next prev parent reply other threads:[~2026-08-15 21:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-15 4:45 [PATCH 00/12] arm64/bti: Fix kernel BTI issues with livepatch, large kernels, toolchains Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 01/12] arm64/bti: Add BTI landing pad to __sdei_asm_handler() Josh Poimboeuf
2026-08-15 5:01 ` sashiko-bot
2026-08-15 4:45 ` [PATCH 02/12] arm64/module: Fix BTI exceptions caused by omitted landing pads in Clang 21 Josh Poimboeuf
2026-08-15 5:00 ` sashiko-bot
2026-08-15 9:56 ` Ard Biesheuvel
2026-08-15 18:57 ` Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 03/12] arm64/bti: Fix BTI linker failures with long branches into .idmap.text Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 04/12] arm64/bti: Work around ld crash caused by linker script aliases Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 05/12] arm64/bti: Add link error for large kernels with BTI and unsupported toolchains Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 06/12] arm64/bti: Add link error for large kernels with BTI and livepatch Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 07/12] arm64/bti: Advertise BTI in assembly objects Josh Poimboeuf
2026-08-15 5:03 ` sashiko-bot
2026-08-15 21:53 ` Mark Brown [this message]
2026-08-15 4:45 ` [PATCH 08/12] arm64/bti: Enable BTI in the pi/ startup code Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 09/12] efi/libstub: Preserve the GNU property note Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 10/12] efi/libstub: Remove obsolete .note.gnu.property workaround Josh Poimboeuf
2026-08-15 4:45 ` [PATCH 11/12] arm64/bti: Force-enable BTI linker veneers Josh Poimboeuf
2026-08-15 5:00 ` sashiko-bot
2026-08-15 4:45 ` [PATCH 12/12] arm64/bti: Enable kernel BTI for GCC Josh Poimboeuf
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