Hi Herbert, Changes v11: - algif_skcipher: remove len < ctx->used in recvmsg as requested by Herbert and verified by the latest test code in libkcapi. - algif_skcipher/algif_aead: simplify _recvmsg error code path With the changes, you will see a lot of code duplication now as I deliberately tried to use the same struct and variable names, the same function names and even the same oder of functions. If you agree to this patch, I volunteer to provide a followup patch that will extract the code duplication into common functions. Please find attached memory management updates to - simplify the code: the old AIO memory management is very complex and seemingly very fragile -- the update now eliminates all reported bugs in the skcipher and AEAD interfaces which allowed the kernel to be crashed by an unprivileged user - streamline the code: there is one code path for AIO and sync operation; the code between algif_skcipher and algif_aead is very similar (if that patch set is accepted, I volunteer to reduce code duplication by moving service operations into af_alg.c and to further unify the TX SGL handling) - unify the AIO and sync operation which only differ in the kernel crypto API callback and whether to wait for the crypto operation or not - fix all reported bugs regarding the handling of multiple IOCBs. The following testing was performed: - stress testing to verify that no memleaks exist - testing using Tadeusz Struck AIO test tool (see https://github.com/tstruk/afalg_async_test) -- the AEAD test is not applicable any more due to the changed user space interface; the skcipher test works once the user space interface change is honored in the test code - using the libkcapi test suite, all tests including the originally failing ones (AIO with multiple IOCBs) work now -- the current libkcapi code artificially limits the AEAD operation to one IOCB. After altering the libkcapi code to allow multiple IOCBs, the testing works flawless. Stephan Mueller (2): crypto: skcipher AF_ALG - overhaul memory management crypto: aead AF_ALG - overhaul memory management crypto/algif_aead.c | 766 ++++++++++++++++++++++++++++-------------------- crypto/algif_skcipher.c | 561 ++++++++++++++++++----------------- 2 files changed, 721 insertions(+), 606 deletions(-) -- 2.9.4
