Mercurial > hg > nginx-quic
view src/os/unix/ngx_setaffinity.h @ 7386:9200b41db765 stable-1.14
HTTP/2: limit the number of idle state switches.
An attack that continuously switches HTTP/2 connection between
idle and active states can result in excessive CPU usage.
This is because when a connection switches to the idle state,
all of its memory pool caches are freed.
This change limits the maximum allowed number of idle state
switches to 10 * http2_max_requests (i.e., 10000 by default).
This limits possible CPU usage in one connection, and also
imposes a limit on the maximum lifetime of a connection.
Initially reported by Gal Goldshtein from F5 Networks.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Tue, 06 Nov 2018 16:29:49 +0300 |
parents | 7296b38f6416 |
children |
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/* * Copyright (C) Nginx, Inc. */ #ifndef _NGX_SETAFFINITY_H_INCLUDED_ #define _NGX_SETAFFINITY_H_INCLUDED_ #if (NGX_HAVE_SCHED_SETAFFINITY || NGX_HAVE_CPUSET_SETAFFINITY) #define NGX_HAVE_CPU_AFFINITY 1 #if (NGX_HAVE_SCHED_SETAFFINITY) typedef cpu_set_t ngx_cpuset_t; #elif (NGX_HAVE_CPUSET_SETAFFINITY) #include <sys/cpuset.h> typedef cpuset_t ngx_cpuset_t; #endif void ngx_setaffinity(ngx_cpuset_t *cpu_affinity, ngx_log_t *log); #else #define ngx_setaffinity(cpu_affinity, log) typedef uint64_t ngx_cpuset_t; #endif #endif /* _NGX_SETAFFINITY_H_INCLUDED_ */