linux-kernel - [PATCH AUTOSEL 6.11 43/76] riscv/kexec_file: Fix relocation type R_RISCV_ADD16 and R_RISCV

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Message-ID: <20241004181828.3669209-43-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:17:00 -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,
	arnd@...db.de,
	pasha.tatashin@...een.com,
	surenb@...gle.com,
	kent.overstreet@...ux.dev,
	linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.11 43/76] 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 11c0d2e0becfe..3c37661801f95 100644
--- a/arch/riscv/kernel/elf_kexec.c
+++ b/arch/riscv/kernel/elf_kexec.c
@@ -451,6 +451,12 @@ 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