Re: [LTP] syscalls/cma: Require root for process_vm tests

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On 14 October 2026, Andrea Cervesato wrote:
> syscalls/cma: Require root for process_vm tests

> diff --git a/testcases/kernel/syscalls/cma/process_vm_readv02.c b/testcases/kernel/syscalls/cma/process_vm_readv02.c
> @@ -116,6 +120,7 @@ static struct tst_test test = {
>  	.test_all = run,
>  	.setup = setup,
>  	.cleanup = cleanup,
> +	.needs_root = 1,
>  	.forks_child = 1,
>  	.needs_checkpoints = 1,

Across all three tests, this skips valid non-root runs when Yama is
disabled or ptrace_scope=0, yet UID 0 without CAP_SYS_PTRACE still passes
the framework's geteuid() check and gets EPERM under modes 1/2.
For mode 1, have the target call prctl(PR_SET_PTRACER, getppid(), ...)
before signalling readiness to authorize the parent and its descendants,
including the sibling.
Preserve unprivileged execution where allowed and use tst_cap_action()
with TST_CAP_REQ when CAP_SYS_PTRACE is actually needed, so missing
capabilities produce TCONF.

Verdict - Needs revision

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