kexec-tools: fix for "Unhandled rela relocation: R_X86_64_PLT32" error

In response to a change in binutils, commit b21ebf2fb4c
(x86: Treat R_X86_64_PLT32 as R_X86_64_PC32) was applied to
the linux kernel during the 4.16 development cycle and has
since been backported to earlier stable kernel series. The
change results in the failure message as below when rebooting
via kexec.
 # kexec -l /boot/bzImage --append="console=ttyS0,115200 root=/dev/sda1"
 Unhandled rela relocation: R_X86_64_PLT32

Fix this by replicating the change in kexec.

(From OE-Core rev: 734a1bb8944caef1336f3a9cc98ea104d6be1f57)

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 42 insertions, 0 deletions

diff --git a/meta/recipes-kernel/kexec/kexec-tools/0001-kexec-fix-for-Unhandled-rela-relocation-R_X86_64_PLT.patch b/meta/recipes-kernel/kexec/kexec-tools/0001-kexec-fix-for-Unhandled-rela-relocation-R_X86_64_PLT.patch
new file mode 100644
index 0000000000..e0cced55c1
--- /dev/null
+++ b/meta/recipes-kernel/kexec/kexec-tools/0001-kexec-fix-for-Unhandled-rela-relocation-R_X86_64_PLT.patch
@@ -0,0 +1,41 @@
+From b9de21ef51a7ceab7122a707c188602eae22c4ee Mon Sep 17 00:00:00 2001
+From: Chris Clayton <chris2553@googlemail.com>
+Date: Mon, 20 Aug 2018 12:00:31 +0100
+Subject: [PATCH] kexec: fix for "Unhandled rela relocation: R_X86_64_PLT32" error
+
+In response to a change in binutils, commit b21ebf2fb4c
+(x86: Treat R_X86_64_PLT32 as R_X86_64_PC32) was applied to
+the linux kernel during the 4.16 development cycle and has
+since been backported to earlier stable kernel series. The
+change results in the failure message in $SUBJECT when
+rebooting via kexec.
+
+Fix this by replicating the change in kexec.
+
+Upstream-Status: Backport[https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=b9de21ef51a7ceab7122a707c188602eae22c4ee]
+
+Signed-off-by: Chris Clayton <chris2553@googlemail.com>
+Acked-by: Baoquan He <bhe@redhat.com>
+Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
+Acked-by: Bhupesh Sharma <bhsharma@redhat.com>
+Signed-off-by: Simon Horman <horms@verge.net.au>
+Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
+---
+ kexec/arch/x86_64/kexec-elf-rel-x86_64.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/kexec/arch/x86_64/kexec-elf-rel-x86_64.c b/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
+index 7fdde73..db85b44 100644
+--- a/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
++++ b/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
+@@ -79,6 +79,7 @@ void machine_apply_elf_rel(struct mem_ehdr *UNUSED(ehdr),
+                        goto overflow;
+                break;
+        case R_X86_64_PC32: 
++       case R_X86_64_PLT32:
+                *(uint32_t *)location = value - address;
+                break;
+        default:
+-- 
+2.7.4
+
diff --git a/meta/recipes-kernel/kexec/kexec-tools_2.0.17.bb b/meta/recipes-kernel/kexec/kexec-tools_2.0.17.bb
index f4ec5865e3..dd46901197 100644
--- a/meta/recipes-kernel/kexec/kexec-tools_2.0.17.bb
+++ b/meta/recipes-kernel/kexec/kexec-tools_2.0.17.bb
@@ -18,6 +18,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/utils/kernel/kexec/kexec-tools-${PV}.tar.gz
            file://0010-kexec-ARM-Fix-add_buffer_phys_virt-align-issue.patch \
            file://kexec-x32.patch \
            file://0001-Disable-PIE-during-link.patch \
+           file://0001-kexec-fix-for-Unhandled-rela-relocation-R_X86_64_PLT.patch \
            "
 
 SRC_URI[md5sum] = "8e071ca473694a71e4ae60ed7ef6f377"