On Tue, Mar 21, 2017 at 3:34 PM, Stephan Müller <smueller@xxxxxxxxxx> wrote: > Am Dienstag, 21. März 2017, 07:13:53 CET schrieb Harsh Jain: > > Hi Harsh, > >> Hi, >> >> For tag only AEAD decrypt operation(Zero length Payload). The dst sg >> list pointer panic with general protection fault. I think it should be >> NULL when output buffer is supposed to be empty. >> >> Kcapi command to re-produce the issue >> >> ./kcapi -x 2 -c "gcm(aes)" -i 0d92aa861746b324f20ee6b7 -k >> f4a6a5e5f2066f6dd9ec6fc5169c29043560ef595c9e81e76f42d29212cc581c -a "" >> -t "5f24c68cbe6f32c29652442bf5d483ad" -q "" >> >> Its decrypt operation. Expected result should be EBADMSG. > > Executing this command on a 4.9 kernel, I get: > > bin/kcapi -x 2 -c "gcm(aes)" -i 0d92aa861746b324f20ee6b7 -k > f4a6a5e5f2066f6dd9ec6fc5169c29043560ef595c9e81e76f42d29212cc581c -a "" -t > "5f24c68cbe6f32c29652442bf5d483ad" -q "" > EBADMSG Probably because s/w implementation is not trying to access dst sg pointer because there's nothing to copy in destination buffer. 1 question If we don't have data to copy to destination buffer what should dst pointer contains? > > There is no GP or other error. Can you please provide some details about your > system? I.e. which kernel version and what cipher implementation resolves to > gcm(aes)? I tried with 4.10.13. It's with gcm(aes-chcr). changes which trigger issue is not submitted to community yet. > > Thanks > > Ciao > Stephan
