James,
One more ipr patch to go on top of my previous series I sent. This one fixes
a pretty nasty bug that can cause us to go writing in memory that is not ours.
8<
When ipr's internal driver trace was changed to an atomic, a signed/unsigned
bug slipped in which results in us indexing backwards in our memory buffer
writing on memory that does not below to us. This patch fixes this by removing
the modulo and instead just mask off the low bits.
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---
drivers/scsi/ipr.c | 5 +++--
drivers/scsi/ipr.h | 1 +
2 files changed, 4 insertions(+), 2 deletions(-)
diff -puN drivers/scsi/ipr.h~ipr_trace_index_fix drivers/scsi/ipr.h
--- linux/drivers/scsi/ipr.h~ipr_trace_index_fix 2015-06-22 16:52:15.649018937 -0500
+++ linux-bjking1/drivers/scsi/ipr.h 2015-06-22 16:52:31.895895037 -0500
@@ -1487,6 +1487,7 @@ struct ipr_ioa_cfg {
#define IPR_NUM_TRACE_INDEX_BITS 8
#define IPR_NUM_TRACE_ENTRIES (1 << IPR_NUM_TRACE_INDEX_BITS)
+#define IPR_TRACE_INDEX_MASK (IPR_NUM_TRACE_ENTRIES - 1)
#define IPR_TRACE_SIZE (sizeof(struct ipr_trace_entry) * IPR_NUM_TRACE_ENTRIES)
char trace_start[8];
#define IPR_TRACE_START_LABEL "trace"
diff -puN drivers/scsi/ipr.c~ipr_trace_index_fix drivers/scsi/ipr.c
--- linux/drivers/scsi/ipr.c~ipr_trace_index_fix 2015-06-22 16:52:17.800002537 -0500
+++ linux-bjking1/drivers/scsi/ipr.c 2015-06-22 16:53:17.327548285 -0500
@@ -599,9 +599,10 @@ static void ipr_trc_hook(struct ipr_cmnd
{
struct ipr_trace_entry *trace_entry;
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+ unsigned int trace_index;
- trace_entry = &ioa_cfg->trace[atomic_add_return
- (1, &ioa_cfg->trace_index)%IPR_NUM_TRACE_ENTRIES];
+ trace_index = atomic_add_return(1, &ioa_cfg->trace_index) & IPR_TRACE_INDEX_MASK;
+ trace_entry = &ioa_cfg->trace[trace_index];
trace_entry->time = jiffies;
trace_entry->op_code = ipr_cmd->ioarcb.cmd_pkt.cdb[0];
trace_entry->type = type;
_
--
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