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view src/os/win32/ngx_alloc.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 | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_ALLOC_H_INCLUDED_ #define _NGX_ALLOC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> void *ngx_alloc(size_t size, ngx_log_t *log); void *ngx_calloc(size_t size, ngx_log_t *log); #define ngx_free free #define ngx_memalign(alignment, size, log) ngx_alloc(size, log) extern ngx_uint_t ngx_pagesize; extern ngx_uint_t ngx_pagesize_shift; extern ngx_uint_t ngx_cacheline_size; #endif /* _NGX_ALLOC_H_INCLUDED_ */