Mercurial > hg > nginx
view src/http/modules/ngx_http_ssi_filter_module.h @ 9282:acb8548c00e9
HTTP/3: fixed dynamic table overflow.
While inserting a new entry into the dynamic table, first the entry is added,
and then older entries are evicted until table size is within capacity. After
the first step, the number of entries may temporarily exceed the maximum
calculated from capacity by one entry, which previously caused table overflow.
The easiest way to trigger the issue is to keep adding entries with empty names
and values until first eviction.
The issue was introduced by 987bee4363d1.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Tue, 28 May 2024 17:18:50 +0400 |
parents | 49e7db44b57c |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_HTTP_SSI_FILTER_H_INCLUDED_ #define _NGX_HTTP_SSI_FILTER_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #define NGX_HTTP_SSI_MAX_PARAMS 16 #define NGX_HTTP_SSI_COMMAND_LEN 32 #define NGX_HTTP_SSI_PARAM_LEN 32 #define NGX_HTTP_SSI_PARAMS_N 4 #define NGX_HTTP_SSI_COND_IF 1 #define NGX_HTTP_SSI_COND_ELSE 2 #define NGX_HTTP_SSI_NO_ENCODING 0 #define NGX_HTTP_SSI_URL_ENCODING 1 #define NGX_HTTP_SSI_ENTITY_ENCODING 2 typedef struct { ngx_hash_t hash; ngx_hash_keys_arrays_t commands; } ngx_http_ssi_main_conf_t; typedef struct { ngx_buf_t *buf; u_char *pos; u_char *copy_start; u_char *copy_end; ngx_uint_t key; ngx_str_t command; ngx_array_t params; ngx_table_elt_t *param; ngx_table_elt_t params_array[NGX_HTTP_SSI_PARAMS_N]; ngx_chain_t *in; ngx_chain_t *out; ngx_chain_t **last_out; ngx_chain_t *busy; ngx_chain_t *free; ngx_uint_t state; ngx_uint_t saved_state; size_t saved; size_t looked; size_t value_len; ngx_list_t *variables; ngx_array_t *blocks; #if (NGX_PCRE) ngx_uint_t ncaptures; int *captures; u_char *captures_data; #endif unsigned shared:1; unsigned conditional:2; unsigned encoding:2; unsigned block:1; unsigned output:1; unsigned output_chosen:1; ngx_http_request_t *wait; void *value_buf; ngx_str_t timefmt; ngx_str_t errmsg; } ngx_http_ssi_ctx_t; typedef ngx_int_t (*ngx_http_ssi_command_pt) (ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx, ngx_str_t **); typedef struct { ngx_str_t name; ngx_uint_t index; unsigned mandatory:1; unsigned multiple:1; } ngx_http_ssi_param_t; typedef struct { ngx_str_t name; ngx_http_ssi_command_pt handler; ngx_http_ssi_param_t *params; unsigned conditional:2; unsigned block:1; unsigned flush:1; } ngx_http_ssi_command_t; extern ngx_module_t ngx_http_ssi_filter_module; #endif /* _NGX_HTTP_SSI_FILTER_H_INCLUDED_ */