Messages in this thread | | | From | Florian Weimer <> | Subject | Re: [PATCH v3 02/23] rseq: Introduce extensible rseq ABI | Date | Wed, 10 Aug 2022 08:33:58 +0200 |
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* Mathieu Desnoyers:
> Introduce the extensible rseq ABI, where the feature size supported by > the kernel and the required alignment are communicated to user-space > through ELF auxiliary vectors. > > This allows user-space to call rseq registration with a rseq_len of > either 32 bytes for the original struct rseq size (which includes > padding), or larger. > > If rseq_len is larger than 32 bytes, then it must be large enough to > contain the feature size communicated to user-space through ELF > auxiliary vectors.
I don't think this works with the glibc extension mechanism because __rseq_size does not change until the padding is exhausted.
I think you'll need to add the suggested flags to the auxiliary vector, and then we can use that during registration and also communicate these flags via __rseq_flags.
Size and alignment can be stored in a single auxiliary vector entry.
Thanks, Florian
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