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s390/kaslr: add support for R_390_GLOB_DAT relocation type

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Commit "bpf: Process in-kernel BTF" in linux-next introduced an undefined
__weak symbol, which results in an R_390_GLOB_DAT relocation type. That
is not yet handled by the KASLR relocation code, and the kernel stops with
the message "Unknown relocation type".

Add code to detect and handle R_390_GLOB_DAT relocation types and undefined
symbols.

Fixes: 805bc0bc23 ("s390/kernel: build a relocatable kernel")
Cc: <stable@vger.kernel.org> # v5.2+
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Gerald Schaefer
2019-10-21 19:56:00 +02:00
committed by Vasily Gorbik
parent 388bb19be8
commit ac49303d9e
2 changed files with 12 additions and 3 deletions
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arch/s390/kernel/machine_kexec_reloc.c
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@@ -27,6 +27,7 @@ int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
*(u32 *)loc = val;
break;
case R_390_64: /* Direct 64 bit. */
case R_390_GLOB_DAT:
*(u64 *)loc = val;
break;
case R_390_PC16: /* PC relative 16 bit. */