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| author | Will Deacon <will.deacon@arm.com> | 2015-03-17 12:15:02 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-09-17 11:57:03 +0100 |
| commit | df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00 (patch) | |
| tree | 866dd49a0acc98317cc3866738f3b417f44eccf2 /arch/arm64/kernel/module.c | |
| parent | bdec97a855ef1e239f130f7a11584721c9a1bf04 (diff) | |
| download | blackbird-obmc-linux-df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00.tar.gz blackbird-obmc-linux-df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00.zip | |
arm64: errata: add module build workaround for erratum #843419
Cortex-A53 processors <= r0p4 are affected by erratum #843419 which can
lead to a memory access using an incorrect address in certain sequences
headed by an ADRP instruction.
There is a linker fix to generate veneers for ADRP instructions, but
this doesn't work for kernel modules which are built as unlinked ELF
objects.
This patch adds a new config option for the erratum which, when enabled,
builds kernel modules with the mcmodel=large flag. This uses absolute
addressing for all kernel symbols, thereby removing the use of ADRP as
a PC-relative form of addressing. The ADRP relocs are removed from the
module loader so that we fail to load any potentially affected modules.
Cc: <stable@vger.kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/module.c')
| -rw-r--r-- | arch/arm64/kernel/module.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index 67bf4107f6ef..876eb8df50bf 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -332,12 +332,14 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 0, 21, AARCH64_INSN_IMM_ADR); break; +#ifndef CONFIG_ARM64_ERRATUM_843419 case R_AARCH64_ADR_PREL_PG_HI21_NC: overflow_check = false; case R_AARCH64_ADR_PREL_PG_HI21: ovf = reloc_insn_imm(RELOC_OP_PAGE, loc, val, 12, 21, AARCH64_INSN_IMM_ADR); break; +#endif case R_AARCH64_ADD_ABS_LO12_NC: case R_AARCH64_LDST8_ABS_LO12_NC: overflow_check = false; |
