Messages in this thread Patch in this message | | | Subject | [PATCH 09/19] x86, mpx: trace entry to bounds exception paths | From | Dave Hansen <> | Date | Fri, 08 May 2015 11:59:52 -0700 |
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From: Dave Hansen <dave.hansen@linux.intel.com>
There are two basic things that can happen as the result of a bounds exception (#BR):
1. We allocate a new bounds table 2. We pass up a bounds exception to userspace.
This patch adds a trace point for the case where we are passing the exception up to userspace with a signal.
We are also explicit that we're printing out the inverse of the 'upper' that we encounter. If you want to filter, for instance, you need to ~ the value first.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> ---
b/arch/x86/include/asm/trace/mpx.h | 25 +++++++++++++++++++++++++ b/arch/x86/mm/mpx.c | 1 + 2 files changed, 26 insertions(+)
diff -puN arch/x86/include/asm/trace/mpx.h~x86-mpx-trace-1 arch/x86/include/asm/trace/mpx.h --- a/arch/x86/include/asm/trace/mpx.h~x86-mpx-trace-1 2015-05-08 11:46:14.657747026 -0700 +++ b/arch/x86/include/asm/trace/mpx.h 2015-05-08 11:46:14.662747252 -0700 @@ -8,6 +8,31 @@ #ifdef CONFIG_X86_INTEL_MPX +TRACE_EVENT(mpx_bounds_register_exception, + + TP_PROTO(void *addr_referenced, + struct bndreg *bndreg), + TP_ARGS(addr_referenced, bndreg), + + TP_STRUCT__entry( + __field(void *, addr_referenced) + __field(u64, lower_bound) + __field(u64, upper_bound) + ), + + TP_fast_assign( + __entry->addr_referenced = addr_referenced; + __entry->lower_bound = bndreg->lower_bound; + __entry->upper_bound = bndreg->upper_bound; + ), + + TP_printk("address referenced: 0x%p bounds: lower: 0x%llx ~upper: 0x%llx", + __entry->addr_referenced, + __entry->lower_bound, + ~__entry->upper_bound + ) +); + TRACE_EVENT(bounds_exception_mpx, TP_PROTO(struct bndcsr *bndcsr), diff -puN arch/x86/mm/mpx.c~x86-mpx-trace-1 arch/x86/mm/mpx.c --- a/arch/x86/mm/mpx.c~x86-mpx-trace-1 2015-05-08 11:46:14.658747071 -0700 +++ b/arch/x86/mm/mpx.c 2015-05-08 11:46:14.662747252 -0700 @@ -336,6 +336,7 @@ siginfo_t *mpx_generate_siginfo(struct p err = -EINVAL; goto err_out; } + trace_mpx_bounds_register_exception(info->si_addr, bndreg); return info; err_out: /* info might be NULL, but kfree() handles that */ _
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