diff options
Diffstat (limited to 'arch/arm64/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/arm64/kernel/hw_breakpoint.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c index ab76b36dce82..73cce8ac8368 100644 --- a/arch/arm64/kernel/hw_breakpoint.c +++ b/arch/arm64/kernel/hw_breakpoint.c @@ -559,6 +559,15 @@ int hw_breakpoint_arch_parse(struct perf_event *bp, else alignment_mask = 0x7; offset = hw->address & alignment_mask; + + /* + * BAS is an 8-bit field in WCR/BCR; the shift below would + * silently drop the high bits of ctrl.len when offset + len + * exceeds 8, programming hardware to watch fewer bytes than + * the user requested. + */ + if (((u32)hw->ctrl.len << offset) > ARM_BREAKPOINT_LEN_8) + return -EINVAL; } hw->address &= ~alignment_mask; |