[{"id":3673357,"web_url":"http://patchwork.ozlabs.org/comment/3673357/","msgid":"","date":"2026-04-04T00:57:55","subject":"Re: [PATCH v2 1/2] powerpc/kdump: fix KASAN sanitization flag for\n core_$(BITS).o","submitter":{"id":79126,"url":"http://patchwork.ozlabs.org/api/people/79126/","name":"Ritesh Harjani (IBM)","email":"ritesh.list@gmail.com"},"content":"Sourabh Jain writes:\n\n> KASAN instrumentation is intended to be disabled for the kexec core\n> code, but the existing Makefile entry misses the object suffix. As a\n> result, the flag is not applied correctly to core_$(BITS).o.\n>\n> So when KASAN is enabled, kexec_copy_flush and copy_segments in\n> kexec/core_64.c are instrumented, which can result in accesses to\n> shadow memory via normal address translation paths. Since these run\n> with the MMU disabled, such accesses may trigger page faults\n> (bad_page_fault) that cannot be handled in the kdump path, ultimately\n> causing a hang and preventing the kdump kernel from booting. The same\n> is true for kexec as well, since the same functions are used there.\n>\n> Update the entry to include the “.o” suffix so that KASAN\n> instrumentation is properly disabled for this object file.\n>\n> Fixes: 2ab2d5794f14 (\"powerpc/kasan: Disable address sanitization in kexec paths\")\n> Reported-by: Venkat Rao Bagalkote \n> Closes: https://lore.kernel.org/all/1dee8891-8bcc-46b4-93f3-fc3a774abd5b@linux.ibm.com/\n> Cc: Aboorva Devarajan \n> Cc: Aditya Gupta \n> Cc: Daniel Axtens \n> Cc: Hari Bathini \n> Cc: Madhavan Srinivasan \n> Cc: Michael Ellerman \n> Cc: Shivang Upadhyay \n\nI guess you missed adding:\nCc: stable@vger.kernel.org\n\n> Reviewed-by: Ritesh Harjani (IBM) \n> Tested-by: Venkat Rao Bagalkote \n> Acked-by: Mahesh Salgaonkar \n> Signed-off-by: Sourabh Jain \n> ---\n> Changelog:\n>\n> v2:\n> - Add Reviewed-by, Acked-by and Tested-by tags\n> - No functional changes\n> \n> v1:\n> https://lore.kernel.org/all/20260321053121.614022-1-sourabhjain@linux.ibm.com/\n> ---\n> arch/powerpc/kexec/Makefile | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n>\n> diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile\n> index 470eb0453e17..ec7a0eed75dc 100644\n> --- a/arch/powerpc/kexec/Makefile\n> +++ b/arch/powerpc/kexec/Makefile\n> @@ -16,4 +16,4 @@ GCOV_PROFILE_core_$(BITS).o := n\n> KCOV_INSTRUMENT_core_$(BITS).o := n\n> UBSAN_SANITIZE_core_$(BITS).o := n\n> KASAN_SANITIZE_core.o := n\n> -KASAN_SANITIZE_core_$(BITS) := n\n> +KASAN_SANITIZE_core_$(BITS).o := n\n> -- \n> 2.52.0","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=B+0Dwtfg;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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charset=utf-8","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3673370,"web_url":"http://patchwork.ozlabs.org/comment/3673370/","msgid":"<20edd82e-62ce-480c-a075-c604df6a3a27@linux.ibm.com>","date":"2026-04-04T03:20:13","subject":"Re: [PATCH v2 1/2] powerpc/kdump: fix KASAN sanitization flag for\n core_$(BITS).o","submitter":{"id":77202,"url":"http://patchwork.ozlabs.org/api/people/77202/","name":"Sourabh Jain","email":"sourabhjain@linux.ibm.com"},"content":"On 04/04/26 06:27, Ritesh Harjani (IBM) wrote:\n> Sourabh Jain writes:\n>\n>> KASAN instrumentation is intended to be disabled for the kexec core\n>> code, but the existing Makefile entry misses the object suffix. As a\n>> result, the flag is not applied correctly to core_$(BITS).o.\n>>\n>> So when KASAN is enabled, kexec_copy_flush and copy_segments in\n>> kexec/core_64.c are instrumented, which can result in accesses to\n>> shadow memory via normal address translation paths. Since these run\n>> with the MMU disabled, such accesses may trigger page faults\n>> (bad_page_fault) that cannot be handled in the kdump path, ultimately\n>> causing a hang and preventing the kdump kernel from booting. The same\n>> is true for kexec as well, since the same functions are used there.\n>>\n>> Update the entry to include the “.o” suffix so that KASAN\n>> instrumentation is properly disabled for this object file.\n>>\n>> Fixes: 2ab2d5794f14 (\"powerpc/kasan: Disable address sanitization in kexec paths\")\n>> Reported-by: Venkat Rao Bagalkote \n>> Closes: https://lore.kernel.org/all/1dee8891-8bcc-46b4-93f3-fc3a774abd5b@linux.ibm.com/\n>> Cc: Aboorva Devarajan \n>> Cc: Aditya Gupta \n>> Cc: Daniel Axtens \n>> Cc: Hari Bathini \n>> Cc: Madhavan Srinivasan \n>> Cc: Michael Ellerman \n>> Cc: Shivang Upadhyay \n> I guess you missed adding:\n> Cc: stable@vger.kernel.org\n\nYou’re right, I missed it.\nI’ll include it in the next revision.\n\nThanks,\nSourabh Jain","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=thGTo2yv;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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