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crypto: omap-crypto - fix userspace copied buffer access

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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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tero Kristo 2020-05-27 15:24:25 +03:00 committed by Herbert Xu
parent 8dc43636e3
commit 7e34e0bbc6
1 changed files with 8 additions and 2 deletions
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10
drivers/crypto/omap-crypto.c
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@ -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;