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Message-ID: <20241004182718.3673735-25-sashal@kernel.org>
Date: Fri, 4 Oct 2024 14:26:36 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Ying Sun <sunying@...c.iscas.ac.cn>,
Petr Tesarik <petr@...arici.cz>,
Andrew Jones <ajones@...tanamicro.com>,
Palmer Dabbelt <palmer@...osinc.com>,
Sasha Levin <sashal@...nel.org>,
paul.walmsley@...ive.com,
palmer@...belt.com,
aou@...s.berkeley.edu,
akpm@...ux-foundation.org,
bhe@...hat.com,
pasha.tatashin@...een.com,
arnd@...db.de,
surenb@...gle.com,
kent.overstreet@...ux.dev,
linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 25/42] riscv/kexec_file: Fix relocation type R_RISCV_ADD16 and R_RISCV_SUB16 unknown
From: Ying Sun <sunying@...c.iscas.ac.cn>
[ Upstream commit c6ebf2c528470a09be77d0d9df2c6617ea037ac5 ]
Runs on the kernel with CONFIG_RISCV_ALTERNATIVE enabled:
kexec -sl vmlinux
Error:
kexec_image: Unknown rela relocation: 34
kexec_image: Error loading purgatory ret=-8
and
kexec_image: Unknown rela relocation: 38
kexec_image: Error loading purgatory ret=-8
The purgatory code uses the 16-bit addition and subtraction relocation
type, but not handled, resulting in kexec_file_load failure.
So add handle to arch_kexec_apply_relocations_add().
Tested on RISC-V64 Qemu-virt, issue fixed.
Co-developed-by: Petr Tesarik <petr@...arici.cz>
Signed-off-by: Petr Tesarik <petr@...arici.cz>
Signed-off-by: Ying Sun <sunying@...c.iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Link: https://lore.kernel.org/r/20240711083236.2859632-1-sunying@isrc.iscas.ac.cn
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
arch/riscv/kernel/elf_kexec.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/riscv/kernel/elf_kexec.c b/arch/riscv/kernel/elf_kexec.c
index b3b96ff46d193..88721bea81fcd 100644
--- a/arch/riscv/kernel/elf_kexec.c
+++ b/arch/riscv/kernel/elf_kexec.c
@@ -444,6 +444,12 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
*(u32 *)loc = CLEAN_IMM(CJTYPE, *(u32 *)loc) |
ENCODE_CJTYPE_IMM(val - addr);
break;
+ case R_RISCV_ADD16:
+ *(u16 *)loc += val;
+ break;
+ case R_RISCV_SUB16:
+ *(u16 *)loc -= val;
+ break;
case R_RISCV_ADD32:
*(u32 *)loc += val;
break;
--
2.43.0
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