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27 March 2024, 02:37:15 UTC
Revision df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00 authored by Will Deacon on 17 March 2015, 12:15:02 UTC, committed by Will Deacon on 17 September 2015, 10:57:03 UTC 
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>
1 parent bdec97a
History
Tip revision: df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00 authored by Will Deacon on 17 March 2015, 12:15:02 UTC
arm64: errata: add module build workaround for erratum #843419
Tip revision: df057cc
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