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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4c1cbcbd6c
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: 805bc0bc23 ("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>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/elf.h>
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#include <asm/kexec.h>
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int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
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unsigned long addr)
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{
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switch (r_type) {
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case R_390_NONE:
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break;
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case R_390_8: /* Direct 8 bit. */
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*(u8 *)loc = val;
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break;
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case R_390_12: /* Direct 12 bit. */
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*(u16 *)loc &= 0xf000;
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*(u16 *)loc |= val & 0xfff;
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break;
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case R_390_16: /* Direct 16 bit. */
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*(u16 *)loc = val;
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break;
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case R_390_20: /* Direct 20 bit. */
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*(u32 *)loc &= 0xf00000ff;
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*(u32 *)loc |= (val & 0xfff) << 16; /* DL */
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*(u32 *)loc |= (val & 0xff000) >> 4; /* DH */
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break;
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case R_390_32: /* Direct 32 bit. */
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*(u32 *)loc = val;
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break;
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case R_390_64: /* Direct 64 bit. */
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case R_390_GLOB_DAT:
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case R_390_JMP_SLOT:
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*(u64 *)loc = val;
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break;
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case R_390_PC16: /* PC relative 16 bit. */
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*(u16 *)loc = (val - addr);
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break;
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case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
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*(u16 *)loc = (val - addr) >> 1;
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break;
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case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
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*(u32 *)loc = (val - addr) >> 1;
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break;
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case R_390_PC32: /* PC relative 32 bit. */
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*(u32 *)loc = (val - addr);
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break;
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case R_390_PC64: /* PC relative 64 bit. */
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*(u64 *)loc = (val - addr);
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break;
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case R_390_RELATIVE:
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*(unsigned long *) loc = val;
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break;
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default:
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return 1;
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}
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return 0;
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}
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