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[82.192.242.114]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa20e044b59sm726873866b.143.2024.11.19.23.01.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Nov 2024 23:01:24 -0800 (PST) Sender: Salvatore Bonaccorso Received: by eldamar.lan (Postfix, from userid 1000) id 007E4BE2EE7; Wed, 20 Nov 2024 08:01:23 +0100 (CET) Date: Wed, 20 Nov 2024 08:01:23 +0100 From: Salvatore Bonaccorso To: Dominique Martinet Cc: Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, y0un9n132@gmail.com, Kees Cook , Thomas Gleixner , Jiri Kosina , Sasha Levin , regressions@lists.linux.dev Subject: Re: [PATCH 6.1 175/321] x86: Increase brk randomness entropy for 64-bit systems Message-ID: References: <20240827143838.192435816@linuxfoundation.org> <20240827143844.891898677@linuxfoundation.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hi, On Wed, Nov 20, 2024 at 10:48:42AM +0900, Dominique Martinet wrote: > Hi all, > > this patch introduces a regression in some versions of qemu-aarch64 (at > least as built by debian): > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1087822 > > It doesn't look like it still is a problem with newer versions of qemu > so I'm not sure if this should be reverted on master, but it took me a bit > of time to track this down to this commit as my reproducer isn't great, > so it might make sense to revert this commit on stable branches? > > (I don't remember the policies on "don't break userspace", but qemu-user > is a bit of a special case here so I'll leave that up to Greg) > > > I've confirmed that this bug occurs on top of the latest v6.1.118 and > goes away reverting this. > (I've also checked the problem also occurs on master and reverting the > patch also works around the issue there at this point) Interestigly there is another report in Debian which identifies the backport of upstream commit 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d to cause issues in the 6.1.y series: https://bugs.debian.org/1085762 https://lore.kernel.org/regressions/18f34d636390454180240e6a61af9217@kumkeo.de/T/#u Regards, Salvatore