Mercurial > hg > nginx
view src/core/ngx_bpf.h @ 9322:d6f75dd66761 default tip
Mp4: added and updated sanity checks for "end" handling.
When handling incorrect data in ngx_http_mp4_crop_stsc_data(),
trak->end_chunk_samples might end up being arbitrary large, leading
to reading before the buffer in ngx_http_mp4_update_stsz_atom(). Fix
is to check that trak->end_chunk_samples corresponds to a memory within
the stsz atom data. For consistency, trak->start_chunk_samples
is checked similarly.
Similarly, trak->end_chunk might end up being smaller than trak->start_chunk,
leading to reading memory after the buffer in ngx_http_mp4_update_stco_atom()
and ngx_http_mp4_update_co64_atom(). Corresponding checks are updated
to explicitly test (trak->end_chunk - trak->start_chunk) instead of just
checking trak->end_chunk and assuming it is larger than trak->start_chunk.
This is generally in line with existing checks of
(trak->end_sample - trak->start_sample) in ngx_http_mp4_update_stsz_atom(),
where trak->end_sample might also become smaller than trak->start_sample
when handling incorrect data in ngx_http_mp4_crop_stts_data().
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Sun, 25 Aug 2024 06:35:40 +0300 |
parents | d3747ba486e7 |
children |
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/* * Copyright (C) Nginx, Inc. */ #ifndef _NGX_BPF_H_INCLUDED_ #define _NGX_BPF_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <linux/bpf.h> typedef struct { char *name; int offset; } ngx_bpf_reloc_t; typedef struct { char *license; enum bpf_prog_type type; struct bpf_insn *ins; size_t nins; ngx_bpf_reloc_t *relocs; size_t nrelocs; } ngx_bpf_program_t; void ngx_bpf_program_link(ngx_bpf_program_t *program, const char *symbol, int fd); int ngx_bpf_load_program(ngx_log_t *log, ngx_bpf_program_t *program); int ngx_bpf_map_create(ngx_log_t *log, enum bpf_map_type type, int key_size, int value_size, int max_entries, uint32_t map_flags); int ngx_bpf_map_update(int fd, const void *key, const void *value, uint64_t flags); int ngx_bpf_map_delete(int fd, const void *key); int ngx_bpf_map_lookup(int fd, const void *key, void *value); #endif /* _NGX_BPF_H_INCLUDED_ */