diff mbox series

[RESEND,PATCHv3,3/7] crypto: omap-crypto: fix userspace copied buffer access

Message ID 20200527122429.14888-4-t-kristo@ti.com (mailing list archive)
State New, archived
Headers show
Series crypto: omap: various fixes | expand

Commit Message

Tero Kristo May 27, 2020, 12:24 p.m. UTC 
In case buffers are copied from userspace, directly accessing the page
will most likely fail because it hasn't been mapped into the kernel
memory space. Fix the issue by forcing a kmap / kunmap within the
cleanup functionality.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
---
v3:
  - Added PageSlab() check to the cache flushing portion, and changed
    the used flush API to be flush_kernel_dcache_page()

 drivers/crypto/omap-crypto.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/crypto/omap-crypto.c b/drivers/crypto/omap-crypto.c
index cc88b7362bc2..94b2dba90f0d 100644
--- a/drivers/crypto/omap-crypto.c
+++ b/drivers/crypto/omap-crypto.c
@@ -178,11 +178,17 @@  static void omap_crypto_copy_data(struct scatterlist *src,
 		amt = min(src->length - srco, dst->length - dsto);
 		amt = min(len, amt);
 
-		srcb = sg_virt(src) + srco;
-		dstb = sg_virt(dst) + dsto;
+		srcb = kmap_atomic(sg_page(src)) + srco + src->offset;
+		dstb = kmap_atomic(sg_page(dst)) + dsto + dst->offset;
 
 		memcpy(dstb, srcb, amt);
 
+		if (!PageSlab(sg_page(dst)))
+			flush_kernel_dcache_page(sg_page(dst));
+
+		kunmap_atomic(srcb);
+		kunmap_atomic(dstb);
+
 		srco += amt;
 		dsto += amt;
 		len -= amt;