diff options
| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2022-11-22 15:39:05 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-12-27 12:52:10 +0100 |
| commit | ee3e3ac05c2631ce1f12d88c9cc9a092f8fe947a (patch) | |
| tree | e0c6d2672012d5e85edf1b6d633c27d34aec3382 /kernel/ptrace.c | |
| parent | 317c8194e6aeb8b3b573ad139fc2a0635856498e (diff) | |
rseq: Introduce extensible rseq ABI
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
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 54482193e1ed..0786450074c1 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -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, }; |