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x86, ds: allow small debug store buffers

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Check the buffer size more precisely to allow buffers for exactly
one element provided the base address is already properly aligned.

Add a debug store selftest.

Reported-by: Stephane Eranian <eranian@googlemail.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144606.139137000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
2009-04-03 16:43:51 +02:00
committed by Ingo Molnar
parent 608780a904
commit 150f5164c1
2 changed files with 10 additions and 5 deletions
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9
arch/x86/kernel/ds.c
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@@ -656,6 +656,7 @@ static int ds_request(struct ds_tracer *tracer, struct ds_trace *trace,
{
struct ds_context *context;
int error;
size_t req_size;
error = -EOPNOTSUPP;
if (!ds_cfg.sizeof_rec[qual])
@@ -665,9 +666,13 @@ static int ds_request(struct ds_tracer *tracer, struct ds_trace *trace,
if (!base)
goto out;
/* We need space for alignment adjustments in ds_init_ds_trace(). */
req_size = ds_cfg.sizeof_rec[qual];
/* We might need space for alignment adjustments. */
if (!IS_ALIGNED((unsigned long)base, DS_ALIGNMENT))
req_size += DS_ALIGNMENT;
error = -EINVAL;
if (size < (DS_ALIGNMENT + ds_cfg.sizeof_rec[qual]))
if (size < req_size)
goto out;
if (th != (size_t)-1) {