Return-Path: Received: by vger.rutgers.edu via listexpand id ; Mon, 3 Apr 2000 12:48:47 -0400 Received: by vger.rutgers.edu id ; Mon, 3 Apr 2000 12:45:03 -0400 Received: from sunsite.ms.mff.cuni.cz ([195.113.19.66]:4921 "EHLO sunsite.ms.mff.cuni.cz") by vger.rutgers.edu with ESMTP id ; Mon, 3 Apr 2000 12:39:12 -0400 Date: Mon, 3 Apr 2000 18:46:34 +0200 From: Jakub Jelinek To: torvalds@transmeta.com Cc: alan@redhat.com, linux-kernel@vger.rutgers.edu Subject: [PATCH] Avoid kernel memory leaks in signal handling Message-ID: <20000403184634.F1468@sunsite.ms.mff.cuni.cz> Reply-To: Jakub Jelinek Mime-Version: 1.0 Content-Type: multipart/mixed; boundary=DocE+STaALJfprDB X-Mailer: Mutt 0.95.4us Sender: owner-linux-kernel@vger.rutgers.edu Content-Length: 17744 Lines: 265 --DocE+STaALJfprDB Content-Type: text/plain; charset=us-ascii Hi! Attached is an updated version of the patch to avoid leaking kernel memory into userspace with signals. This time it should support all architectures currently in the 2.3 tree. At the same time it optimizes signal handling a little bit and fixes siginfo_t conversion for sparc64(sparc), ia64(i386) and in the future would help mips64 and ppc64 as well. To copy siginfo_t in the kernel one uses copy_siginfo(siginfo_t *to, siginfo_t *from) instead of memcpy resp. direct assignment (this one can be implemented as memcpy by the architecture but can be optimized), to copy siginfo_t to userland kernel calls copy_siginfo_to_user(siginfo_t *to, siginfo_t *from) The latter has to make sure kernel does not leak any non-initialized siginfo_t memory (ie. has to copy only the si_code, si_signo, si_errno and the relevant union member entries). 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