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authorKrzysztof Kozlowski <krzk@kernel.org>2017-03-08 23:14:20 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2017-03-09 18:14:31 +0800
commit28b62b1458685d8f68f67d9b2d511bf8fa32b746 (patch)
treeb598841daa8c5de4e21763c5d2d895acfe98195e
parentb985735be7afea3a5e0570ce2ea0b662c0e12e19 (diff)
crypto: s5p-sss - Fix spinlock recursion on LRW(AES)
Running TCRYPT with LRW compiled causes spinlock recursion: testing speed of async lrw(aes) (lrw(ecb-aes-s5p)) encryption tcrypt: test 0 (256 bit key, 16 byte blocks): 19007 operations in 1 seconds (304112 bytes) tcrypt: test 1 (256 bit key, 64 byte blocks): 15753 operations in 1 seconds (1008192 bytes) tcrypt: test 2 (256 bit key, 256 byte blocks): 14293 operations in 1 seconds (3659008 bytes) tcrypt: test 3 (256 bit key, 1024 byte blocks): 11906 operations in 1 seconds (12191744 bytes) tcrypt: test 4 (256 bit key, 8192 byte blocks): BUG: spinlock recursion on CPU#1, irq/84-10830000/89  lock: 0xeea99a68, .magic: dead4ead, .owner: irq/84-10830000/89, .owner_cpu: 1 CPU: 1 PID: 89 Comm: irq/84-10830000 Not tainted 4.11.0-rc1-00001-g897ca6d0800d #559 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c010e1ec>] (unwind_backtrace) from [<c010ae1c>] (show_stack+0x10/0x14) [<c010ae1c>] (show_stack) from [<c03449c0>] (dump_stack+0x78/0x8c) [<c03449c0>] (dump_stack) from [<c015de68>] (do_raw_spin_lock+0x11c/0x120) [<c015de68>] (do_raw_spin_lock) from [<c0720110>] (_raw_spin_lock_irqsave+0x20/0x28) [<c0720110>] (_raw_spin_lock_irqsave) from [<c0572ca0>] (s5p_aes_crypt+0x2c/0xb4) [<c0572ca0>] (s5p_aes_crypt) from [<bf1d8aa4>] (do_encrypt+0x78/0xb0 [lrw]) [<bf1d8aa4>] (do_encrypt [lrw]) from [<bf1d8b00>] (encrypt_done+0x24/0x54 [lrw]) [<bf1d8b00>] (encrypt_done [lrw]) from [<c05732a0>] (s5p_aes_complete+0x60/0xcc) [<c05732a0>] (s5p_aes_complete) from [<c0573440>] (s5p_aes_interrupt+0x134/0x1a0) [<c0573440>] (s5p_aes_interrupt) from [<c01667c4>] (irq_thread_fn+0x1c/0x54) [<c01667c4>] (irq_thread_fn) from [<c0166a98>] (irq_thread+0x12c/0x1e0) [<c0166a98>] (irq_thread) from [<c0136a28>] (kthread+0x108/0x138) [<c0136a28>] (kthread) from [<c0107778>] (ret_from_fork+0x14/0x3c) Interrupt handling routine was calling req->base.complete() under spinlock. In most cases this wasn't fatal but when combined with some of the cipher modes (like LRW) this caused recursion - starting the new encryption (s5p_aes_crypt()) while still holding the spinlock from previous round (s5p_aes_complete()). Beside that, the s5p_aes_interrupt() error handling path could execute two completions in case of error for RX and TX blocks. Rewrite the interrupt handling routine and the completion by: 1. Splitting the operations on scatterlist copies from s5p_aes_complete() into separate s5p_sg_done(). This still should be done under lock. The s5p_aes_complete() now only calls req->base.complete() and it has to be called outside of lock. 2. Moving the s5p_aes_complete() out of spinlock critical sections. In interrupt service routine s5p_aes_interrupts(), it appeared in few places, including error paths inside other functions called from ISR. This code was not so obvious to read so simplify it by putting the s5p_aes_complete() only within ISR level. Reported-by: Nathan Royce <nroycea+kernel@gmail.com> Cc: <stable@vger.kernel.org> # v4.10.x: 07de4bc88c crypto: s5p-sss - Fix completing Cc: <stable@vger.kernel.org> # v4.10.x Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--drivers/crypto/s5p-sss.c127
1 files changed, 82 insertions, 45 deletions
diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index a668286d62cb..1b9da3dc799b 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -270,7 +270,7 @@ static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,
scatterwalk_done(&walk, out, 0);
}
-static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
+static void s5p_sg_done(struct s5p_aes_dev *dev)
{
if (dev->sg_dst_cpy) {
dev_dbg(dev->dev,
@@ -281,8 +281,11 @@ static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
}
s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
+}
- /* holding a lock outside */
+/* Calls the completion. Cannot be called with dev->lock hold. */
+static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
+{
dev->req->base.complete(&dev->req->base, err);
dev->busy = false;
}
@@ -368,51 +371,44 @@ exit:
}
/*
- * Returns true if new transmitting (output) data is ready and its
- * address+length have to be written to device (by calling
- * s5p_set_dma_outdata()). False otherwise.
+ * Returns -ERRNO on error (mapping of new data failed).
+ * On success returns:
+ * - 0 if there is no more data,
+ * - 1 if new transmitting (output) data is ready and its address+length
+ * have to be written to device (by calling s5p_set_dma_outdata()).
*/
-static bool s5p_aes_tx(struct s5p_aes_dev *dev)
+static int s5p_aes_tx(struct s5p_aes_dev *dev)
{
- int err = 0;
- bool ret = false;
+ int ret = 0;
s5p_unset_outdata(dev);
if (!sg_is_last(dev->sg_dst)) {
- err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
- if (err)
- s5p_aes_complete(dev, err);
- else
- ret = true;
- } else {
- s5p_aes_complete(dev, err);
-
- dev->busy = true;
- tasklet_schedule(&dev->tasklet);
+ ret = s5p_set_outdata(dev, sg_next(dev->sg_dst));
+ if (!ret)
+ ret = 1;
}
return ret;
}
/*
- * Returns true if new receiving (input) data is ready and its
- * address+length have to be written to device (by calling
- * s5p_set_dma_indata()). False otherwise.
+ * Returns -ERRNO on error (mapping of new data failed).
+ * On success returns:
+ * - 0 if there is no more data,
+ * - 1 if new receiving (input) data is ready and its address+length
+ * have to be written to device (by calling s5p_set_dma_indata()).
*/
-static bool s5p_aes_rx(struct s5p_aes_dev *dev)
+static int s5p_aes_rx(struct s5p_aes_dev *dev/*, bool *set_dma*/)
{
- int err;
- bool ret = false;
+ int ret = 0;
s5p_unset_indata(dev);
if (!sg_is_last(dev->sg_src)) {
- err = s5p_set_indata(dev, sg_next(dev->sg_src));
- if (err)
- s5p_aes_complete(dev, err);
- else
- ret = true;
+ ret = s5p_set_indata(dev, sg_next(dev->sg_src));
+ if (!ret)
+ ret = 1;
}
return ret;
@@ -422,33 +418,73 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
- bool set_dma_tx = false;
- bool set_dma_rx = false;
+ int err_dma_tx = 0;
+ int err_dma_rx = 0;
+ bool tx_end = false;
unsigned long flags;
uint32_t status;
+ int err;
spin_lock_irqsave(&dev->lock, flags);
+ /*
+ * Handle rx or tx interrupt. If there is still data (scatterlist did not
+ * reach end), then map next scatterlist entry.
+ * In case of such mapping error, s5p_aes_complete() should be called.
+ *
+ * If there is no more data in tx scatter list, call s5p_aes_complete()
+ * and schedule new tasklet.
+ */
status = SSS_READ(dev, FCINTSTAT);
if (status & SSS_FCINTSTAT_BRDMAINT)
- set_dma_rx = s5p_aes_rx(dev);
- if (status & SSS_FCINTSTAT_BTDMAINT)
- set_dma_tx = s5p_aes_tx(dev);
+ err_dma_rx = s5p_aes_rx(dev);
+
+ if (status & SSS_FCINTSTAT_BTDMAINT) {
+ if (sg_is_last(dev->sg_dst))
+ tx_end = true;
+ err_dma_tx = s5p_aes_tx(dev);
+ }
SSS_WRITE(dev, FCINTPEND, status);
- /*
- * Writing length of DMA block (either receiving or transmitting)
- * will start the operation immediately, so this should be done
- * at the end (even after clearing pending interrupts to not miss the
- * interrupt).
- */
- if (set_dma_tx)
- s5p_set_dma_outdata(dev, dev->sg_dst);
- if (set_dma_rx)
- s5p_set_dma_indata(dev, dev->sg_src);
+ if (err_dma_rx < 0) {
+ err = err_dma_rx;
+ goto error;
+ }
+ if (err_dma_tx < 0) {
+ err = err_dma_tx;
+ goto error;
+ }
+
+ if (tx_end) {
+ s5p_sg_done(dev);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ s5p_aes_complete(dev, 0);
+ dev->busy = true;
+ tasklet_schedule(&dev->tasklet);
+ } else {
+ /*
+ * Writing length of DMA block (either receiving or
+ * transmitting) will start the operation immediately, so this
+ * should be done at the end (even after clearing pending
+ * interrupts to not miss the interrupt).
+ */
+ if (err_dma_tx == 1)
+ s5p_set_dma_outdata(dev, dev->sg_dst);
+ if (err_dma_rx == 1)
+ s5p_set_dma_indata(dev, dev->sg_src);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ }
+
+ return IRQ_HANDLED;
+
+error:
+ s5p_sg_done(dev);
spin_unlock_irqrestore(&dev->lock, flags);
+ s5p_aes_complete(dev, err);
return IRQ_HANDLED;
}
@@ -597,8 +633,9 @@ outdata_error:
s5p_unset_indata(dev);
indata_error:
- s5p_aes_complete(dev, err);
+ s5p_sg_done(dev);
spin_unlock_irqrestore(&dev->lock, flags);
+ s5p_aes_complete(dev, err);
}
static void s5p_tasklet_cb(unsigned long data)