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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
This commit is contained in:
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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2
kernel/ptrace.c
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@@ -813,7 +813,7 @@ static long ptrace_get_rseq_configuration(struct task_struct *task,
{
struct ptrace_rseq_configuration conf = {
.rseq_abi_pointer = (u64)(uintptr_t)task->rseq,
.rseq_abi_size = sizeof(*task->rseq),
.rseq_abi_size = task->rseq_len,
.signature = task->rseq_sig,
.flags = 0,
};