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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2020-05-06 13:45:52 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-05-20 10:13:27 +0200 |
| commit | 4c1cbcbd6c56c79de2c07159be4f55386bb0bef2 (patch) | |
| tree | 10a9330ab04f8e478652931c8ccd6526023cb140 /arch/s390/kernel/machine_kexec_reloc.c | |
| parent | ac8372f3b4e41015549b331a4f350224661e7fc6 (diff) | |
| download | linux-4c1cbcbd6c56c79de2c07159be4f55386bb0bef2.tar.gz | |
s390/kaslr: add support for R_390_JMP_SLOT relocation type
With certain kernel configurations, the R_390_JMP_SLOT relocation type
might be generated, which is not expected by the KASLR relocation code,
and the kernel stops with the message "Unknown relocation type".
This was found with a zfcpdump kernel config, where CONFIG_MODULES=n
and CONFIG_VFIO=n. In that case, symbol_get() is used on undefined
__weak symbols in virt/kvm/vfio.c, which results in the generation
of R_390_JMP_SLOT relocation types.
Fix this by handling R_390_JMP_SLOT similar to R_390_GLOB_DAT.
Fixes: 805bc0bc238f ("s390/kernel: build a relocatable kernel")
Cc: <stable@vger.kernel.org> # v5.2+
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/machine_kexec_reloc.c')
| -rw-r--r-- | arch/s390/kernel/machine_kexec_reloc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/machine_kexec_reloc.c b/arch/s390/kernel/machine_kexec_reloc.c index d5035de9020e..b7182cec48dc 100644 --- a/arch/s390/kernel/machine_kexec_reloc.c +++ b/arch/s390/kernel/machine_kexec_reloc.c @@ -28,6 +28,7 @@ int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val, break; case R_390_64: /* Direct 64 bit. */ case R_390_GLOB_DAT: + case R_390_JMP_SLOT: *(u64 *)loc = val; break; case R_390_PC16: /* PC relative 16 bit. */ |