From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753952AbbCQMil (ORCPT ); Tue, 17 Mar 2015 08:38:41 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:35859 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752814AbbCQMig (ORCPT ); Tue, 17 Mar 2015 08:38:36 -0400 From: Quentin Casasnovas To: lkml Cc: Oleg Nesterov , Borislav Petkov , Linus Torvalds , Quentin Casasnovas Subject: [PATCH 1/7] modpost: add strict white-listing when referencing sections. Date: Tue, 17 Mar 2015 13:39:56 +0100 Message-Id: <1426596002-26128-2-git-send-email-quentin.casasnovas@oracle.com> X-Mailer: git-send-email 2.0.5 In-Reply-To: <1426596002-26128-1-git-send-email-quentin.casasnovas@oracle.com> References: <1426596002-26128-1-git-send-email-quentin.casasnovas@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prints a warning when a section references a section outside a strict white-list. This will be useful to print a warning if __ex_table references a non-executable section. Signed-off-by: Quentin Casasnovas --- scripts/mod/modpost.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index d439856..7094a57 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -925,7 +925,8 @@ enum mismatch { struct sectioncheck { const char *fromsec[20]; - const char *tosec[20]; + const char *bad_tosec[20]; + const char *good_tosec[20]; enum mismatch mismatch; const char *symbol_white_list[20]; }; @@ -936,19 +937,19 @@ static const struct sectioncheck sectioncheck[] = { */ { .fromsec = { TEXT_SECTIONS, NULL }, - .tosec = { ALL_INIT_SECTIONS, NULL }, + .bad_tosec = { ALL_INIT_SECTIONS, NULL }, .mismatch = TEXT_TO_ANY_INIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, { .fromsec = { DATA_SECTIONS, NULL }, - .tosec = { ALL_XXXINIT_SECTIONS, NULL }, + .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL }, .mismatch = DATA_TO_ANY_INIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, { .fromsec = { DATA_SECTIONS, NULL }, - .tosec = { INIT_SECTIONS, NULL }, + .bad_tosec = { INIT_SECTIONS, NULL }, .mismatch = DATA_TO_ANY_INIT, .symbol_white_list = { "*_template", "*_timer", "*_sht", "*_ops", @@ -957,54 +958,54 @@ static const struct sectioncheck sectioncheck[] = { }, { .fromsec = { TEXT_SECTIONS, NULL }, - .tosec = { ALL_EXIT_SECTIONS, NULL }, + .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, .mismatch = TEXT_TO_ANY_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, { .fromsec = { DATA_SECTIONS, NULL }, - .tosec = { ALL_EXIT_SECTIONS, NULL }, + .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, .mismatch = DATA_TO_ANY_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, /* Do not reference init code/data from meminit code/data */ { .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, - .tosec = { INIT_SECTIONS, NULL }, + .bad_tosec = { INIT_SECTIONS, NULL }, .mismatch = XXXINIT_TO_SOME_INIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, /* Do not reference exit code/data from memexit code/data */ { .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, - .tosec = { EXIT_SECTIONS, NULL }, + .bad_tosec = { EXIT_SECTIONS, NULL }, .mismatch = XXXEXIT_TO_SOME_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, /* Do not use exit code/data from init code */ { .fromsec = { ALL_INIT_SECTIONS, NULL }, - .tosec = { ALL_EXIT_SECTIONS, NULL }, + .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, .mismatch = ANY_INIT_TO_ANY_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, /* Do not use init code/data from exit code */ { .fromsec = { ALL_EXIT_SECTIONS, NULL }, - .tosec = { ALL_INIT_SECTIONS, NULL }, + .bad_tosec = { ALL_INIT_SECTIONS, NULL }, .mismatch = ANY_EXIT_TO_ANY_INIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, }, { .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, - .tosec = { INIT_SECTIONS, NULL }, + .bad_tosec = { INIT_SECTIONS, NULL }, .mismatch = ANY_INIT_TO_ANY_EXIT, .symbol_white_list = { NULL }, }, /* Do not export init/exit functions or data */ { .fromsec = { "__ksymtab*", NULL }, - .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, + .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, .mismatch = EXPORT_TO_INIT_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, } @@ -1018,9 +1019,12 @@ static const struct sectioncheck *section_mismatch( const struct sectioncheck *check = §ioncheck[0]; for (i = 0; i < elems; i++) { - if (match(fromsec, check->fromsec) && - match(tosec, check->tosec)) - return check; + if (match(fromsec, check->fromsec)) { + if (check->bad_tosec[0] && match(tosec, check->bad_tosec)) + return check; + if (check->good_tosec[0] && !match(tosec, check->good_tosec)) + return check; + } check++; } return NULL; -- 2.0.5