Mercurial > hg > nginx-quic
view src/os/unix/ngx_alloc.h @ 7400:be5cb9c67c05
Mp4: fixed possible pointer overflow on 32-bit platforms.
On 32-bit platforms mp4->buffer_pos might overflow when a large
enough (close to 4 gigabytes) atom is being skipped, resulting in
incorrect memory addesses being read further in the code. In most
cases this results in harmless errors being logged, though may also
result in a segmentation fault if hitting unmapped pages.
To address this, ngx_mp4_atom_next() now only increments mp4->buffer_pos
up to mp4->buffer_end. This ensures that overflow cannot happen.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 21 Nov 2018 20:23:16 +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 /* * Linux has memalign() or posix_memalign() * Solaris has memalign() * FreeBSD 7.0 has posix_memalign(), besides, early version's malloc() * aligns allocations bigger than page size at the page boundary */ #if (NGX_HAVE_POSIX_MEMALIGN || NGX_HAVE_MEMALIGN) void *ngx_memalign(size_t alignment, size_t size, ngx_log_t *log); #else #define ngx_memalign(alignment, size, log) ngx_alloc(size, log) #endif 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_ */