--- Log opened Tue Dec 10 00:00:33 2019
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06:55 < elichai2> something makes no sense with valgrind, I have `secp256k1_gej *target` and I run `  VG_CHECK(&target->x, sizeof(target->x)); VG_CHECK(&target->y, sizeof(target->y)); VG_CHECK(&target->z, sizeof(target->z)); VG_CHECK(&target->infinity, sizeof(target->infinity)); VG_CHECK(target, sizeof(*target));` and somehow the last one fails. `Uninitialised byte(s) found during client check request`
06:55 < elichai2> How can this be? how can all the fields in the struct be intialized but the whole struct isn't? does it check padding to for some stupid reason?
07:22 < andytoshi> how could a check of `sizeof(*target)` starting at `target` **not** check padding?
07:23 < andytoshi> i'm curious what you're trying to do here
07:24 < andytoshi> strictly speaking, in C there is no way to meaningfully initialize padding. the bytes are always allowed to change out from under you, even between reads
07:25 < andytoshi> but in practice you can memset them, because this is needed for a ton of POSIX APIs to make sense
07:29 < andytoshi> in libsecp we don't do any posixy stuff like casting between pointers to different structs. the padding bytes should never matter.
07:30 < elichai2> andytoshi: trying to debug a valgrind error, so I used the valgrind check macro. And I guess you're right. So what's the best way to check if a variable is initialized or not? (for debugging purposes)
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07:43 < elichai2> I think I know what the problem is. I assumed `secp256k1_gej_add_ge_var` always intializes the value and I didn't check for infinity before normalizing the field elements. but there's a branch in `secp256k1_gej_add_ge_var` that sets infinity to 1 and returns. without touching the field elements
07:44 < elichai2> *what my problem is :)
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09:22 < andytoshi> elichai2: not that it's much of an excuse, but fwiw this is something of a rite of passage writing libsecp unit tests
09:22 < andytoshi> that whenever you use the internal API functions you wind up needing to memset things to avoid valgrind "jump on uninitialized value" errors
09:22 < elichai2> andytoshi: that you must check for infinity before accessing fe?
09:22 < elichai2> oh yeah that makes sense
09:23 < elichai2> *some sense :)
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--- Log closed Wed Dec 11 00:00:33 2019