lkml.org 
[lkml]   [2019]   [Mar]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectRE: [PATCH 4.14 31/34] perf/x86/intel: Fix memory corruption
Date
With the patch, the kernel crash is not seen on 4.14, 4.19 and 4.20 kernels.

-----Original Message-----
From: DSouza, Nelson
Sent: Monday, March 18, 2019 11:21 AM
To: 'Greg Kroah-Hartman' <gregkh@linuxfoundation.org>; linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org; Tony Jones <tonyj@suse.com>; Peter Zijlstra (Intel) <peterz@infradead.org>; Thomas Gleixner <tglx@linutronix.de>; eranian@google.com; jolsa@redhat.com; stable@kernel.org
Subject: RE: [PATCH 4.14 31/34] perf/x86/intel: Fix memory corruption

Hi Greg,

I was able to reproduce the kernel crash on 4.14, 4.19 and 4.20 kernels. Will apply your patches and re-test.

Thanks,
Nelson

-----Original Message-----
From: Greg Kroah-Hartman [mailto:gregkh@linuxfoundation.org]
Sent: Monday, March 18, 2019 2:26 AM
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; stable@vger.kernel.org; Tony Jones <tonyj@suse.com>; DSouza, Nelson <nelson.dsouza@intel.com>; Peter Zijlstra (Intel) <peterz@infradead.org>; Thomas Gleixner <tglx@linutronix.de>; eranian@google.com; jolsa@redhat.com; stable@kernel.org
Subject: [PATCH 4.14 31/34] perf/x86/intel: Fix memory corruption

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <peterz@infradead.org>

commit ede271b059463731cbd6dffe55ffd70d7dbe8392 upstream.

Through:

validate_event()
x86_pmu.get_event_constraints(.idx=-1)
tfa_get_event_constraints()
dyn_constraint()

cpuc->constraint_list[-1] is used, which is an obvious out-of-bound access.

In this case, simply skip the TFA constraint code, there is no event constraint with just PMC3, therefore the code will never result in the empty set.

Fixes: 400816f60c54 ("perf/x86/intel: Implement support for TSX Force Abort")
Reported-by: Tony Jones <tonyj@suse.com>
Reported-by: "DSouza, Nelson" <nelson.dsouza@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tony Jones <tonyj@suse.com>
Tested-by: "DSouza, Nelson" <nelson.dsouza@intel.com>
Cc: eranian@google.com
Cc: jolsa@redhat.com
Cc: stable@kernel.org
Link: https://lkml.kernel.org/r/20190314130705.441549378@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/events/intel/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3262,7 +3262,7 @@ tfa_get_event_constraints(struct cpu_hw_
/*
* Without TFA we must not use PMC3.
*/
- if (!allow_tsx_force_abort && test_bit(3, c->idxmsk)) {
+ if (!allow_tsx_force_abort && test_bit(3, c->idxmsk) && idx >= 0) {
c = dyn_constraint(cpuc, c, idx);
c->idxmsk64 &= ~(1ULL << 3);
c->weight--;

\
 
 \ /
  Last update: 2019-03-18 21:30    [W:0.156 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site