arm64: entry: Ensure branch through syscall table is bounded under speculation

Browse source

In a similar manner to array_index_mask_nospec, this patch introduces an
assembly macro (mask_nospec64) which can be used to bound a value under
speculation. This macro is then used to ensure that the indirect branch
through the syscall table is bounded under speculation, with out-of-range
addresses speculating as calls to sys_io_setup (0).

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

This commit is contained in:

Will Deacon 2018-02-05 15:34:20 +00:00 • committed by Catalin Marinas

parent 4d8efc2d5e

commit 6314d90e64

2 changed files with 13 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

11

arch/arm64/include/asm/assembler.h

View file

2

arch/arm64/kernel/entry.S

View file