backport upstream patches
Signed-off-by: Zhipeng Xie <xiezhipeng1@huawei.com>
This commit is contained in:
Zhipeng Xie
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7f267089a2
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@ -0,0 +1,60 @@
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From e06664f379eab0b3f80c504c6656f805bba30e69 Mon Sep 17 00:00:00 2001
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From: David Vernet <void@manifault.com>
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Date: Thu, 13 Jan 2022 12:57:15 -0800
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Subject: [PATCH] kpatch-build: Add missing allocation failure checks
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In kpatch-build, there are a number of places where a dynamic allocation
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is performed, but the allocation is not checked for a failure. The
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common pattern in kpatch-build is to check whether the returned pointer
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is NULL, and if so, invoke the ERROR() macro to print a message and
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abort the program.
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kpatch_create_mcount_sections(), CORRELATE_ELEMENT(), and
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create_klp_arch_sections() all had dynamic allocations without failure
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checks. This diff adjusts those callsites to properly check for a failed
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allocation, and ERROR() accordingly.
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Signed-off-by: David Vernet <void@manifault.com>
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---
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kpatch-build/create-diff-object.c | 4 ++++
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kpatch-build/create-klp-module.c | 2 ++
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2 files changed, 6 insertions(+)
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diff --git a/kpatch-build/create-diff-object.c b/kpatch-build/create-diff-object.c
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index 442d8f8..01e5d63 100644
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--- a/kpatch-build/create-diff-object.c
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+++ b/kpatch-build/create-diff-object.c
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@@ -979,6 +979,8 @@ do { \
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log_debug("renaming %s %s to %s\n", \
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kindstr, e2->name, e1->name); \
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e2->name = strdup(e1->name); \
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+ if (!e2->name) \
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+ ERROR("strdup"); \
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} \
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} while (0)
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@@ -3688,6 +3690,8 @@ static void kpatch_create_mcount_sections(struct kpatch_elf *kelf)
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/* Make a writable copy of the text section data */
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newdata = malloc(sym->sec->data->d_size);
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+ if (!newdata)
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+ ERROR("malloc");
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memcpy(newdata, sym->sec->data->d_buf, sym->sec->data->d_size);
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sym->sec->data->d_buf = newdata;
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insn = newdata;
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diff --git a/kpatch-build/create-klp-module.c b/kpatch-build/create-klp-module.c
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index 547e587..8ceb8f3 100644
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--- a/kpatch-build/create-klp-module.c
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+++ b/kpatch-build/create-klp-module.c
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@@ -343,6 +343,8 @@ static void create_klp_arch_sections(struct kpatch_elf *kelf, char *strings)
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new_size = old_size + base->data->d_size;
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sec->data->d_buf = realloc(sec->data->d_buf, new_size);
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+ if (!sec->data->d_buf)
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+ ERROR("realloc");
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sec->data->d_size = new_size;
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sec->sh.sh_size = sec->data->d_size;
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memcpy(sec->data->d_buf + old_size,
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--
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2.27.0
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@ -0,0 +1,48 @@
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From 20c31ce6e82430ae0df0e8014058cfde83196ea0 Mon Sep 17 00:00:00 2001
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From: Markus Boehme <markubo@amazon.com>
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Date: Sat, 15 Jan 2022 01:00:39 +0100
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Subject: [PATCH] create-diff-object: add support for .retpoline_sites section
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Commit 134ab5bd1883 ("objtool,x86: Replace alternatives with .retpoline_sites")
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in the kernel starts keeping track of retpoline thunk call sites in a
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dedicated section rather than via the alternatives mechanism.
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The .retpoline_sites section needs to have its entries and relocations
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for changed symbols included in the patch ELF when building for kernel
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5.16+ with CONFIG_RETPOLINE=y.
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Signed-off-by: Markus Boehme <markubo@amazon.com>
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---
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kpatch-build/create-diff-object.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/kpatch-build/create-diff-object.c b/kpatch-build/create-diff-object.c
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index 01e5d63..bbb40ed 100644
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--- a/kpatch-build/create-diff-object.c
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+++ b/kpatch-build/create-diff-object.c
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@@ -2233,6 +2233,11 @@ static int static_call_sites_group_size(struct kpatch_elf *kelf, int offset)
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return size;
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}
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+
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+static int retpoline_sites_group_size(struct kpatch_elf *kelf, int offset)
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+{
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+ return 4;
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+}
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#endif
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#ifdef __powerpc64__
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static int fixup_entry_group_size(struct kpatch_elf *kelf, int offset)
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@@ -2349,6 +2354,10 @@ static struct special_section special_sections[] = {
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.name = ".static_call_sites",
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.group_size = static_call_sites_group_size,
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},
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+ {
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+ .name = ".retpoline_sites",
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+ .group_size = retpoline_sites_group_size,
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+ },
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#endif
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#ifdef __powerpc64__
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{
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--
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2.27.0
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10
kpatch.spec
10
kpatch.spec
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Name: kpatch
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Epoch: 1
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Version: 0.9.5
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Release: 2
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Release: 3
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Summary: A Linux dynamic kernel patching infrastructure
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License: GPLv2
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@ -38,6 +38,8 @@ Patch0022:0022-use-original-reloc-for-symbols-exported-from-modules.patch
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Patch0023:0023-create-diff-object-create-dynamic-relocs-for-changed.patch
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Patch0024:0024-kpatch-build-support-CROSS_COMPILE.patch
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Patch0025:0025-create-diff-object-update-for-__already_done.patch
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Patch0026:0026-kpatch-build-Add-missing-allocation-failure-checks.patch
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Patch0027:0027-create-diff-object-add-support-for-.retpoline_sites-.patch
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BuildRequires: gcc elfutils-libelf-devel kernel-devel git
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Requires: bc make gcc patch bison flex openssl-devel
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@ -98,6 +100,12 @@ popd
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%{_mandir}/man1/*.1.gz
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%changelog
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* Wed Jan 26 2022 Zhipeng Xie<xiezhipeng1@huawei.com> -1:0.9.5-3
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- Type:enhancement
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- ID:NA
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- SUG:NA
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- DESC:backport upstream patch
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* Wed Dec 22 2021 Wentao Fan<fanwentao@huawei.com> -1:0.9.5-2
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- Type:enhancement
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- ID:NA
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