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Sat, 10 Aug 2024 09:24:09 +0000 (UTC) Date: Sat, 10 Aug 2024 11:25:05 +0200 From: Borislav Petkov To: Andrew Zaborowski Cc: "linux-edac@vger.kernel.org" , "linux-mm@kvack.org" , Eric Biederman , "x86@kernel.org" , Tony Subject: Re: [RESEND][PATCH 1/3] x86: Add task_struct flag to force SIGBUS on MCE Message-ID: <20240810092454.GAZrcx5kZ8mNkpa-io@fat_crate.local> References: <6273D749-9CEC-45E4-8C56-FA3A1DBE1137@alien8.de> <20240808145331.GAZrTb60FX_I3p0Ukx@fat_crate.local> <20240809083229.GAZrXUHfjgVcHSZPsb@fat_crate.local> <20240810032134.GAZrbcvpn_cYzFdEwB@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Stat-Signature: gut5bsd7y6b6rxcugk6uaa17pdfd8uu7 X-Rspamd-Queue-Id: DDA4080012 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1723281860-922918 X-HE-Meta: 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 XjxfJveJ RtUyh6Rx7DaOSXqU3uDE+Urtab9p5u6RdV0HVoP1W43ACCCFnM6Yvktz1L2Czr6yDKt4RLsHWoTlHYyigerS3lZcZYhq/2cJAD9YGCxpY8kqnCVUj3FG3cPWxbSsNYXhXmv1EwpkEFTPDoakisyQ21eSp/KWxjBWwisQfMP3AXfCUlrro+Ks437KqfI1qOxvvuUyx1173w2uP/Eoh2q3ZX2gn6uY1lNXYrl6rUE/ed0bSnizUDQIwVe0N6xCKHGRY73bZz7cWp6bO1jZw+zlyqigRFTpwznpSbFvRoq88KjmFlJbZG+weLK9BB4LV3e1h6UbF X-Bogosity: Ham, tests=bogofilter, spamicity=0.000298, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: So, to sum up the thread here: 1. Arguably, tasks which have encountered a memory error should get sent a SIGBUS. 2. if a valid use case appears, the proper fix should be not to sprinkle special-handling code in random syscalls in a whack-a-mole fashion but to note somewhere in the task struct that the task has encountered a memory error and then *override* the signal it gets sent to it with a SIGBUS one. I.e., this should be a generic solution, if anything. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette