Messages in this thread | | | Subject | Re: [PATCH 1/4] x86/crypto: camellia: Fix function prototypes | From | João Moreira <> | Date | Mon, 16 Apr 2018 11:35:58 -0300 |
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> >> +static inline void camellia_enc_blk(void *ctx, u8 *dst, const u8 *src) >> { >> - __camellia_enc_blk(ctx, dst, src, false); >> + __camellia_enc_blk((struct camellia_ctx *) ctx, dst, src, false); >> } > > I don't see how this is an improvement: instead of having a proper type there's > now an opaque type and an ugly (and dangerous) type cast. > > What does "compatible with CFI requirements" mean?
For "compatible with CFI requirements", I meant: given a set of functions that are invoked through a given set of pointers, all functions and pointers in these sets have the same prototype. I added a note about this CFI heuristic in the cover letter, but I guess I should have been clearer there and added something more substantial to the commit message.
Regarding the changes, this was the most straight-forward way I found to make the sources compliant with the above, not requiring deeper semantic changes to the underneath invoking code. On the other hand, I agree that there is a collateral damage and that an ideal fix would be the other way around -- removing the opaque type from the pointer instead of adding it to the functions.
I'll try to think of another way and send if I come to something.
Tks, João.
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