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a=rsa-sha256; cv=none; b=PDFtAKZfWldVh3byg+Woe7uJcbex771w/YNthnh6ZLLJlRQNipBZMyMliTOwZSKkwGt0u6 FdjnoFQ0H2s74QW9bOTWZsOgqWKKdBY9+S9P5fHuIjC0jeUQG7IMtJp5JfphBBn5pRcdTB IvGWUHDWfEOz1wgRMiKLzxBa6HWRBT8= X-Rspam-User: X-Rspamd-Server: rspam11 Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=lcOgczNV; spf=pass (imf12.hostedemail.com: domain of jpoimboe@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=jpoimboe@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Stat-Signature: ebtnanpu8uwaijk7kegzmcqf5zfzn34s X-Rspamd-Queue-Id: CCA0240025 X-HE-Tag: 1665513887-43328 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Oct 11, 2022 at 10:24:27AM +0200, Peter Zijlstra wrote: > On Mon, Oct 10, 2022 at 06:20:00PM -0700, Linus Torvalds wrote: > > The other thing I notice from just doing a build is that I now get > > > > vmlinux.o: warning: objtool: kasan_report+0x12: call to > > stackleak_track_stack() with UACCESS enabled > > So kasan_report() is already marked as being special; and it does the > mandatory user_access_save() / user_access_restore() things to fix it > up. > > But it looks like kasan code itself is now getting instrumented by the > stackleak stuff and that inserts a call outside of the > user_access_save()/restore() thing, and *that* is getting flagged. > > Looking at mm/kasan/Makefile it disables a lot of the instrumentation, > but perhaps not enough? I can recreate, but weirdly the below doesn't seem to fix it. diff --git a/mm/kasan/Makefile b/mm/kasan/Makefile index d4837bff3b60..a41cf1235032 100644 --- a/mm/kasan/Makefile +++ b/mm/kasan/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 KASAN_SANITIZE := n +KMSAN_SANITIZE := n UBSAN_SANITIZE := n KCOV_INSTRUMENT := n