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arm64: compat: Allow single-byte watchpoints on all addresses 

Commit d968d2b801 ("ARM: 7497/1: hw_breakpoint: allow single-byte
watchpoints on all addresses") changed the validation requirements for
hardware watchpoints on arch/arm/. Update our compat layer to implement
the same relaxation.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-07-29 11:06:17 +01:00
parent 609488bc97
commit 849adec412
1 changed files with 4 additions and 3 deletions
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7
arch/arm64/kernel/hw_breakpoint.c
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@ -536,13 +536,14 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
/* Aligned */ /* Aligned */
break; break;
case 1: case 1:
/* Allow single byte watchpoint. */
if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
break;
case 2: case 2:
/* Allow halfword watchpoints and breakpoints. */ /* Allow halfword watchpoints and breakpoints. */
if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2) if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
break; break;
case 3:
/* Allow single byte watchpoint. */
if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
break;
default: default:
return -EINVAL; return -EINVAL;
} }