From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 896C01FB51 for ; Tue, 1 Aug 2023 09:40:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9EC6AC433C9; Tue, 1 Aug 2023 09:40:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690882810; bh=2Lm4r4k53/+/LfNNWAvSMh4reQz3swhJGREyZbtI8VU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E3kLa+RyrvyCO+9ioqnCVcvUNXzf5GWK6BWOBzy9dVUlh1S5KoeECHJnWYsgV/WDe SxPMst1t5jzzYbMjoSysDK1uxMy0tXzGIyyUpmv9Q4OG/kIdkPB0z6USprinhE+2T/ 1HugPlk/fJY1jDCflr+TdXwMznh8PsAaV/69IT68= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Janosch Frank , Claudio Imbrenda , Sasha Levin Subject: [PATCH 6.4 011/239] KVM: s390: pv: fix index value of replaced ASCE Date: Tue, 1 Aug 2023 11:17:55 +0200 Message-ID: <20230801091926.065425823@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091925.659598007@linuxfoundation.org> References: <20230801091925.659598007@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Claudio Imbrenda [ Upstream commit c2fceb59bbda16468bda82b002383bff59de89ab ] The index field of the struct page corresponding to a guest ASCE should be 0. When replacing the ASCE in s390_replace_asce(), the index of the new ASCE should also be set to 0. Having the wrong index might lead to the wrong addresses being passed around when notifying pte invalidations, and eventually to validity intercepts (VM crash) if the prefix gets unmapped and the notifier gets called with the wrong address. Reviewed-by: Philippe Mathieu-Daudé Fixes: faa2f72cb356 ("KVM: s390: pv: leak the topmost page table when destroy fails") Reviewed-by: Janosch Frank Signed-off-by: Claudio Imbrenda Message-ID: <20230705111937.33472-3-imbrenda@linux.ibm.com> Signed-off-by: Sasha Levin --- arch/s390/mm/gmap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index dc90d1eb0d554..d7e8297d5642b 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2846,6 +2846,7 @@ int s390_replace_asce(struct gmap *gmap) page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER); if (!page) return -ENOMEM; + page->index = 0; table = page_to_virt(page); memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT)); -- 2.39.2