rseq: Introduce extensible rseq ABI

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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.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-4-mathieu.desnoyers@efficios.com

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Mathieu Desnoyers 2022-11-22 15:39:05 -05:00 • committed by Peter Zijlstra

parent 317c8194e6

commit ee3e3ac05c

3 changed files with 35 additions and 8 deletions

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4

include/linux/sched.h

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2

kernel/ptrace.c

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37

kernel/rseq.c

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