From d3e777c6a6921d8d42be969ae010665323199d9c Mon Sep 17 00:00:00 2001 From: Philipp Rudo Date: Fri, 14 Jan 2022 19:34:04 +0800 Subject: [PATCH] s390/kexec_file: fix error handling when applying relocations stable inclusion from stable-v5.10.88 commit 1208b445a497bf3bb5ca74bea873186b92cb7277 bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1208b445a497bf3bb5ca74bea873186b92cb7277 -------------------------------- [ Upstream commit 41967a37b8eedfee15b81406a9f3015be90d3980 ] arch_kexec_apply_relocations_add currently ignores all errors returned by arch_kexec_do_relocs. This means that every unknown relocation is silently skipped causing unpredictable behavior while the relocated code runs. Fix this by checking for errors and fail kexec_file_load if an unknown relocation type is encountered. The problem was found after gcc changed its behavior and used R_390_PLT32DBL relocations for brasl instruction and relied on ld to resolve the relocations in the final link in case direct calls are possible. As the purgatory code is only linked partially (option -r) ld didn't resolve the relocations leaving them for arch_kexec_do_relocs. But arch_kexec_do_relocs doesn't know how to handle R_390_PLT32DBL relocations so they were silently skipped. This ultimately caused an endless loop in the purgatory as the brasl instructions kept branching to itself. Fixes: 71406883fd35 ("s390/kexec_file: Add kexec_file_load system call") Reported-by: Tao Liu Signed-off-by: Philipp Rudo Link: https://lore.kernel.org/r/20211208130741.5821-3-prudo@redhat.com Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin Signed-off-by: Chen Jun Signed-off-by: Zheng Zengkai --- arch/s390/kernel/machine_kexec_file.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c index e7435f3a3d2d..76cd09879eaf 100644 --- a/arch/s390/kernel/machine_kexec_file.c +++ b/arch/s390/kernel/machine_kexec_file.c @@ -277,6 +277,7 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi, { Elf_Rela *relas; int i, r_type; + int ret; relas = (void *)pi->ehdr + relsec->sh_offset; @@ -311,7 +312,11 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi, addr = section->sh_addr + relas[i].r_offset; r_type = ELF64_R_TYPE(relas[i].r_info); - arch_kexec_do_relocs(r_type, loc, val, addr); + ret = arch_kexec_do_relocs(r_type, loc, val, addr); + if (ret) { + pr_err("Unknown rela relocation: %d\n", r_type); + return -ENOEXEC; + } } return 0; } -- GitLab