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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=gqzJJP1ALgqRLG/SatpbTyBtpWv/Y8f9lPVlBNCrbsY=; b=QkfMCZp9HSQlu/gniAC1X1RRAM55WkUIylCRFwcg0hgQ6fq15o2iKLN5X9mxWvRppZAhgiBT6+6wTDhoMjsKF5exFJyRaKcWNgMEuO+9p2tq2qSCJK7JtlTi4KtpSafUeHmk5zY/axdTAZmcmB/5mzeDItmUsDqRv+t9TgRZNUk= From: Roger Pau Monne To: CC: Konrad Rzeszutek Wilk , Ross Lagerwall , , Roger Pau Monne Subject: [PATCH 3/3] livepatch: correctly handle altinstruction sections Date: Thu, 10 Mar 2022 16:08:34 +0100 Message-ID: <20220310150834.98815-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220310150834.98815-1-roger.pau@citrix.com> References: <20220310150834.98815-1-roger.pau@citrix.com> Content-Type: text/plain; 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Correctly handle them by just ignoring, as it's done with other .init related sections. While there also add .data.ro_after_init section as a read-only section and introduce some syntactic sugar for comparing section names. Signed-off-by: Roger Pau Monné --- I assume this handling of .altinstr* sections was inherited from Linux where the sections are not discarded after load in order to apply alternative patching to the loaded modules after boot. --- common.c | 7 +++++-- create-diff-object.c | 26 -------------------------- 2 files changed, 5 insertions(+), 28 deletions(-) diff --git a/common.c b/common.c index 68a71f7..a148d8a 100644 --- a/common.c +++ b/common.c @@ -249,19 +249,22 @@ int is_text_section(struct section *sec) (sec->sh.sh_flags & SHF_EXECINSTR)); } +#define SEC_MATCH(n) !strncmp(sec->name, n, strlen(n) - 1) int is_rodata_section(struct section *sec) { return sec->sh.sh_type == SHT_PROGBITS && !(sec->sh.sh_flags & (SHF_EXECINSTR | SHF_WRITE)) && - !strncmp(sec->name, ".rodata", 7); + (SEC_MATCH(".rodata") || SEC_MATCH(".data.ro_after_init")); } int is_init_section(struct section *sec) { return sec->sh.sh_type == SHT_PROGBITS && (sec->sh.sh_flags & SHF_ALLOC) && - !strncmp(sec->name, ".init", 5); + (SEC_MATCH(".init") || SEC_MATCH(".text.startup") || + SEC_MATCH(".altinstr") || SEC_MATCH(".ctors")); } +#undef SEC_MATCH int is_debug_section(struct section *sec) { diff --git a/create-diff-object.c b/create-diff-object.c index a516670..ec2afb4 100644 --- a/create-diff-object.c +++ b/create-diff-object.c @@ -995,19 +995,6 @@ static int ex_table_group_size(struct kpatch_elf *kelf, int offset) return size; } -static int altinstructions_group_size(struct kpatch_elf *kelf, int offset) -{ - static int size = 0; - char *str; - if (!size) { - str = getenv("ALT_STRUCT_SIZE"); - size = str ? atoi(str) : 12; - } - - log_debug("altinstr_size=%d\n", size); - return size; -} - static int livepatch_hooks_group_size(struct kpatch_elf *kelf, int offset) { static int size = 0; @@ -1021,11 +1008,6 @@ static int livepatch_hooks_group_size(struct kpatch_elf *kelf, int offset) return size; } -static int undefined_group_size(struct kpatch_elf *kelf, int offset) -{ - return 0; -} - /* * The rela groups in the .fixup section vary in size. The beginning of each * .fixup rela group is referenced by the .ex_table section. To find the size @@ -1099,14 +1081,6 @@ static struct special_section special_sections[] = { .name = ".ex_table", .group_size = ex_table_group_size, }, - { - .name = ".altinstructions", - .group_size = altinstructions_group_size, - }, - { - .name = ".altinstr_replacement", - .group_size = undefined_group_size, - }, { .name = ".livepatch.hooks.load", .group_size = livepatch_hooks_group_size, -- 2.34.1