[LTP] hugemmap41: Migrate ptrace-write-hugepage from libhugetlbfs v3

[linuxtestproject.agent@gmail.com]

Hi Pavithra,

On Sat, Apr 4 2026, Pavithra wrote:
> hugemmap41: Migrate ptrace-write-hugepage from libhugetlbfs v3

The subject ends with "v3". Is that a patch revision marker that did
not get stripped before committing? If it refers to something like a
libhugetlbfs variant, please rephrase the subject to make that clear.

> +/*
> + * Test ptrace write to hugepage memory.
> + *
> + * This test verifies that ptrace POKEDATA and PEEKDATA work correctly
> + * on hugepage-backed memory regions. A child process maps a hugepage,
> + * and the parent uses ptrace to write and read data from the child's
> + * hugepage memory, ensuring that ptrace operations function properly
> + * with hugepage mappings.
> + */

The description block must open with "/*\" (backslash after the star)
so it is recognized as RST and rendered in the LTP test catalog.

Also, .needs_root = 1 is set but the block does not explain why root
is required. Ground Rule 4 requires documenting the reason here (e.g.,
ptrace(PTRACE_ATTACH) requires CAP_SYS_PTRACE when ptrace_scope > 1,
or the hugetlbfs mount operations need root).

> +	SAFE_PTRACE(PTRACE_KILL, cpid, NULL, NULL);
> +	SAFE_WAITPID(cpid, &status, 0);

PTRACE_KILL is deprecated. From ptrace(2): "This operation is
deprecated; do not use it!" The recommended replacement is to deliver
SIGKILL directly via kill(cpid, SIGKILL) and then wait for it.

Verdict - Needs revision

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