[LTP] icmp_rate_limit01: Fix rate limit change on older kernels

[linuxtestproject.agent@gmail.com]

Hi Martin,

On Wed, 29 Apr 2026 14:11:27 +0200, Martin Doucha wrote:
> icmp_rate_limit01: Fix rate limit change on older kernels

> +	if (!access("/proc/sys/net/ipv4/icmp_msgs_burst", F_OK))
> +		SAFE_FILE_PRINTF("/proc/sys/net/ipv4/icmp_msgs_burst", "50");

SAFE_ACCESS() exists in tst_safe_macros.h, but since it calls tst_brk()
on failure it cannot be used here — file absence is the expected case on
pre-v6.12 kernels and handling it gracefully is the whole point. Is raw
access() acceptable for this feature-probe pattern, or should a different
idiom be used?

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- testcases/cve/icmp_rate_limit01.c:203 — sleep(2) in packet_batch()
  used to wait for ICMP responses; consider a poll-based approach.

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