view src/core/ngx_slab.h @ 7667:1ece2ac2555a

OCSP: fixed use-after-free on error. When validating second and further certificates, ssl callback could be called twice to report the error. After the first call client connection is terminated and its memory is released. Prior to the second call and in it released connection memory is accessed. Errors triggering this behavior: - failure to create the request - failure to start resolving OCSP responder name - failure to start connecting to the OCSP responder The fix is to rearrange the code to eliminate the second call.
author Roman Arutyunyan <arut@nginx.com>
date Mon, 15 Jun 2020 20:17:16 +0300
parents 69f9ee0342db
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_SLAB_H_INCLUDED_
#define _NGX_SLAB_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct ngx_slab_page_s  ngx_slab_page_t;

struct ngx_slab_page_s {
    uintptr_t         slab;
    ngx_slab_page_t  *next;
    uintptr_t         prev;
};


typedef struct {
    ngx_uint_t        total;
    ngx_uint_t        used;

    ngx_uint_t        reqs;
    ngx_uint_t        fails;
} ngx_slab_stat_t;


typedef struct {
    ngx_shmtx_sh_t    lock;

    size_t            min_size;
    size_t            min_shift;

    ngx_slab_page_t  *pages;
    ngx_slab_page_t  *last;
    ngx_slab_page_t   free;

    ngx_slab_stat_t  *stats;
    ngx_uint_t        pfree;

    u_char           *start;
    u_char           *end;

    ngx_shmtx_t       mutex;

    u_char           *log_ctx;
    u_char            zero;

    unsigned          log_nomem:1;

    void             *data;
    void             *addr;
} ngx_slab_pool_t;


void ngx_slab_sizes_init(void);
void ngx_slab_init(ngx_slab_pool_t *pool);
void *ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size);
void *ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size);
void *ngx_slab_calloc(ngx_slab_pool_t *pool, size_t size);
void *ngx_slab_calloc_locked(ngx_slab_pool_t *pool, size_t size);
void ngx_slab_free(ngx_slab_pool_t *pool, void *p);
void ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p);


#endif /* _NGX_SLAB_H_INCLUDED_ */