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SubjectRe: [PATCH 01/04] Adding cipher mode context information to crypto_tfm
On Tue, 8 Feb 2005, Fruhwirth Clemens wrote:

> I shot out the last patch too quickly. Having reviewed the mapping one
> more time I noticed, that there as the possibility of "off-by-one"
> unmapping, and instead of doing doubtful guesses, if that's the case, I
> added a base pointer to scatter_walk, which is the pointer returned by
> kmap. Exactly this pointer will be unmapped again, so the vaddr
> comparison in crypto_kunmap doesn't have to do any masking.

You can't call kmap() in softirq context (why was it even trying?):

Debug: sleeping function called from invalid context at arch/i386/mm/highmem.c:5
in_atomic():1, irqs_disabled():0
[<c0103385>] dump_stack+0x17/0x19
[<c01165b5>] __might_sleep+0xc4/0xd7
[<c0112665>] kmap+0x15/0x2e
[<c0223027>] scatterwalk_map+0x5a/0x68
[<c0223063>] scatterwalk_walk+0x2e/0x45b
[<c02239ba>] cbc_decrypt_iv+0x11a/0x15f
[<c0223a18>] cbc_decrypt+0x19/0x1f
[<f88ad587>] esp_input+0x17d/0x409 [esp4]
[<c031b7c4>] xfrm4_rcv_encap+0x102/0x512
[<c02e5b6f>] ip_local_deliver+0x9d/0x28c
[<c02e61bf>] ip_rcv+0x251/0x508
[<c02d177b>] netif_receive_skb+0x1f6/0x223
[<c02d1824>] process_backlog+0x7c/0x10f
[<c02d1930>] net_rx_action+0x79/0xfb
[<c011dfc2>] __do_softirq+0x62/0xcc
[<c01047b6>] do_softirq+0x57/0x5b

- James
James Morris

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