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selftests: riscv: Bypass libc in inactive vector ptrace test

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The ptrace_v_not_enabled test expects the child to reach its ebreak
before it has used the vector extension. That is not guaranteed when
using fork(), because libc may run child atfork handlers before
returning to the test code. In those cases PTRACE_GETREGSET for
NT_RISCV_VECTOR then succeeds instead of returning ENODATA for
inactive vector state.

Use the raw clone syscall with SIGCHLD to keep fork-like semantics
while bypassing libc's fork wrapper and atfork handler chain.

Cc: Andy Chiu <tchiu@tenstorrent.com>
Assisted-by: Claude:claude-sonnet-4-6
Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Link: https://patch.msgid.link/20260707153827.175245-1-andrew.jones@oss.qualcomm.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Andrew Jones 2026-07-07 17:38:27 +02:00 committed by Paul Walmsley
parent 81bbcff0c0
commit 70b439e46e
1 changed files with 3 additions and 2 deletions
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5
tools/testing/selftests/riscv/vector/validate_v_ptrace.c
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@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/uio.h>
@ -25,9 +26,9 @@ TEST(ptrace_v_not_enabled)
SKIP(return, "Vector not supported");
chld_lock = 1;
pid = fork();
pid = (pid_t)syscall(SYS_clone, SIGCHLD, 0, NULL, 0, NULL);
ASSERT_LE(0, pid)
TH_LOG("fork: %m");
TH_LOG("clone: %m");
if (pid == 0) {
while (chld_lock == 1)