I have a situation where I setup scatterlists as:
input scatterlist of 1, address ffffc90003627000 len 0x20000.
output scatterlist of 2, address 0 ffffc90002d45000 len 0x20000
address 1 ffff88003b079d98 len 0x000c
When I call crypto_aead_encrypt(req); it will die with:
kernel: [ 925.151113] BUG: unable to handle kernel paging request at
ffffeb04000b5140
kernel: [ 925.151253] IP: [<ffffffff812f4880>] scatterwalk_done+0x50/0x60
kernel: [ 925.151325] PGD 0
kernel: [ 925.151381] Oops: 0000 [#1] SMP
kernel: [ 925.151442] CPU 1
kernel: [ 925.154255] [<ffffffff812f7640>] blkcipher_walk_done+0xb0/0x230
kernel: [ 925.154255] [<ffffffffa02e9169>] crypto_ctr_crypt+0x129/0x2b0 [ctr]
kernel: [ 925.154255] [<ffffffff812fe580>] ? crypto_aes_set_key+0x40/0x40
kernel: [ 925.154255] [<ffffffff812f6cbd>] async_encrypt+0x3d/0x40
kernel: [ 925.154255] [<ffffffffa0149326>] crypto_ccm_encrypt+0x246/0x290
[ccm]
kernel: [ 925.154255] [<ffffffffa01633bd>] crypto_encrypt+0x26d/0x2d0
What is interesting about that is, if I allocate a linear buffer instead:
dst = kmalloc(cryptlen, GFP_KERNEL); // 0x20000 + 0x000c
sg_init_table(sg, 1 );
sg_set_buf(&sg[0], dst, cryptlen);
crypto_aead_encrypt(req);
will no longer panic. However, when I try to copy the linear buffer back to
scatterlist;
scatterwalk_map_and_copy(dst, sg, 0, cryptlen, 1);
then it will panic there instead.
However, if I replace it with the call:
sg_copy_from_buffer(sg, sg_nents(sg),
dst, cryptlen);
everything works! <-
So, what am I doing wrong that makes scatterwalk_map_and_copy() fail, and
sg_copy_from_buffer() work fine? It would be nice if I could fix it, so I
did not need to copy to a temporary buffer.
Lund
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Jorgen Lundman | <lundman@xxxxxxxxxxx>
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