From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2AC3D1AC8AC for ; Wed, 25 Sep 2024 23:39:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727307586; cv=none; b=Tsjyot8VpxtcH3Q21FaDSGMYy+ANaT2MqOnyJom3WpGrKoZbiDHzKeFcba2v7LXPjiIv5/hUR12rxdAcjCB4ovj8faydAjSfDGJw/uXISkMpe8CDr33XWdHYI9ectMeihYonRL8SX+7SK1Jbj8+NFtH9WyGLUVkrLoRBq1Pe9DU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727307586; c=relaxed/simple; bh=RFwYTaeqemLtmezDNnI4k0C/4IQdB480nO3xNfeeufc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=aSIpWGrIEin6q8gJqLc6/dP4aygne4dj0LycG3AmjfrYs60KNV2gfafBsQLkVd7tOiboQ/MCmjxb31Cp0wvlop1BzKIT96mWqJNns1ls+SInmoSVnqy+uoxEU00TjA0QqCvNsJ8PBuoXOEqSFYoXItKUTeTIgan93O/GXXiEdd8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--mmaurer.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ESVAccaZ; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--mmaurer.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ESVAccaZ" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6d54ab222fcso11426427b3.1 for ; Wed, 25 Sep 2024 16:39:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1727307584; x=1727912384; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=extRuG4D1AdoHKvsMv2fLx/d2D/gEpHsXYLRVzC3Sa0=; b=ESVAccaZMo8sBMfsZ87yiogb5pfUlkD768stOKyfznlax0xv609i8nMB41LemlhnaB S6wlBDBLAlwkhPtJcohCbLPW4eGjexxzRPQYozzRVSt3T4yF1WgvvbF4lx420cAhZrSC 5ybfWOLt5RjHArpeXDHm50b5arwwG+B7EU5e96yzIxFlWtiAmru0CfdvGBy0rhzraLGH cuqWhBv4SFK0ACYJ2cxlUd+Q6ONu1T8rzOKBxEUmGkZT9GxpvnlJFfPlBlKds4FCi4gf HdFIozTsbvPyZmhph9ZNw7xcvxmvc1njNBHoTqqYVy+RYzjEpz+HeYARn7yzcOoQRKzR aUQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727307584; x=1727912384; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=extRuG4D1AdoHKvsMv2fLx/d2D/gEpHsXYLRVzC3Sa0=; b=pRDgVmgy75226VRjqUDojhm/vbAPncsshiv/zpntOq4ScrVLf3z4c3re4ZgLpWl0It AZSV31PqMhIdzE4vnZkI81ImwTn9uB5hsPLZNih+KkQwvGzJ0OLCWd/V3WGHGJcv7kYN S0remcb6owq7zMuzlf3xirmZ6iXh41gT8Ozv1S8x+5IQ44Q2P/P+zw7kxKVXrIh8DgIb ZgpWx+g+EAULv5N5rAvaajQYcRNm5Sg3GRqBMtT5DIhBztM31hSycAYh+9/iyvvIGTRy C9MVgIcUiITVZhcW814gHxX2We0SQcU5l8W7YkJUvoXDyVRT5DYAFMrr1MlG/s8+kxwU BUKA== X-Forwarded-Encrypted: i=1; AJvYcCWSEtdYFlOIPqrETF+tfnn/iMPTjYsRYK3lY14wYuY0rKeG4ejg+fjNzJma3B1bCHe8njzk2w==@lists.linux.dev X-Gm-Message-State: AOJu0YyMoqHhoDCKog1Xsw2dd3gWFm+CKjeVzRpTBf4K3OjWkdiaguZP QaNkBX8X0OwTHVlyb4FKiLYOK0qzcS0tjFvKhh3zqE3FV0tOhfrlZNvYVZiHINaXuyPuAUN9xwX hFvn5eQ== X-Google-Smtp-Source: AGHT+IHi0gSVKxF9796sY6n1cVcgNiz/fsNc836mupUZtqmyvJTlnsLOXeqwbXzuTlIf+2iUj78FZGeorFh0 X-Received: from anyblade.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:1791]) (user=mmaurer job=sendgmr) by 2002:a05:690c:2a92:b0:6e2:2600:ed65 with SMTP id 00721157ae682-6e22600f35dmr247467b3.1.1727307584197; Wed, 25 Sep 2024 16:39:44 -0700 (PDT) Date: Wed, 25 Sep 2024 23:38:25 +0000 In-Reply-To: <20240925233854.90072-1-mmaurer@google.com> Precedence: bulk X-Mailing-List: asahi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240925233854.90072-1-mmaurer@google.com> X-Mailer: git-send-email 2.46.1.824.gd892dcdcdd-goog Message-ID: <20240925233854.90072-11-mmaurer@google.com> Subject: [PATCH v5 10/16] module: Factor out elf_validity_cache_strtab From: Matthew Maurer To: masahiroy@kernel.org, ndesaulniers@google.com, ojeda@kernel.org, gary@garyguo.net, mcgrof@kernel.org, Alex Gaynor Cc: rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, neal@gompa.dev, marcan@marcan.st, j@jannau.net, asahi@lists.linux.dev, linux-modules@vger.kernel.org, Matthew Maurer , Petr Pavlu , Sami Tolvanen , Daniel Gomez , Boqun Feng , "=?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?=" , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross Content-Type: text/plain; charset="UTF-8" This patch only moves the existing strtab population to a function. Validation comes in a following patch, this is split out to make the new validation checks more clearly separated. Signed-off-by: Matthew Maurer --- kernel/module/main.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/kernel/module/main.c b/kernel/module/main.c index e04a228c694a..c082d5d41a8d 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2089,6 +2089,23 @@ static int elf_validity_cache_index(struct load_info *info, int flags) return 0; } +/** + * elf_validity_cache_strtab() - Cache symbol string table + * @info: Load info to read from and update. + * Must have &load_info->sechdrs and &load_info->secstrings populated. + * Must have &load_info->index populated. + * + * Return: 0 on success, negative error code if a check failed. + */ +static int elf_validity_cache_strtab(struct load_info *info) +{ + Elf_Shdr *str_shdr = &info->sechdrs[info->index.str]; + char *strtab = (char *)info->hdr + str_shdr->sh_offset; + + info->strtab = strtab; + return 0; +} + /* * Check userspace passed ELF module against our expectations, and cache * useful variables for further processing as we go. @@ -2122,9 +2139,9 @@ static int elf_validity_cache_copy(struct load_info *info, int flags) err = elf_validity_cache_index(info, flags); if (err < 0) return err; - - /* Sets internal strings. */ - info->strtab = (char *)info->hdr + info->sechdrs[info->index.str].sh_offset; + err = elf_validity_cache_strtab(info); + if (err < 0) + return err; /* This is temporary: point mod into copy of data. */ info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; -- 2.46.1.824.gd892dcdcdd-goog