Mercurial > hg > nginx-quic
view src/core/ngx_file.h @ 7629:f47f7d3d1bfa
Mp4: fixed possible chunk offset overflow.
In "co64" atom chunk start offset is a 64-bit unsigned integer. When trimming
the "mdat" atom, chunk offsets are casted to off_t values which are typically
64-bit signed integers. A specially crafted mp4 file with huge chunk offsets
may lead to off_t overflow and result in negative trim boundaries.
The consequences of the overflow are:
- Incorrect Content-Length header value in the response.
- Negative left boundary of the response file buffer holding the trimmed "mdat".
This leads to pread()/sendfile() errors followed by closing the client
connection.
On rare systems where off_t is a 32-bit integer, this scenario is also feasible
with the "stco" atom.
The fix is to add checks which make sure data chunks referenced by each track
are within the mp4 file boundaries. Additionally a few more checks are added to
ensure mp4 file consistency and log errors.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Wed, 26 Feb 2020 15:10:46 +0300 |
parents | 0c572ed91b36 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_FILE_H_INCLUDED_ #define _NGX_FILE_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> struct ngx_file_s { ngx_fd_t fd; ngx_str_t name; ngx_file_info_t info; off_t offset; off_t sys_offset; ngx_log_t *log; #if (NGX_THREADS || NGX_COMPAT) ngx_int_t (*thread_handler)(ngx_thread_task_t *task, ngx_file_t *file); void *thread_ctx; ngx_thread_task_t *thread_task; #endif #if (NGX_HAVE_FILE_AIO || NGX_COMPAT) ngx_event_aio_t *aio; #endif unsigned valid_info:1; unsigned directio:1; }; #define NGX_MAX_PATH_LEVEL 3 typedef ngx_msec_t (*ngx_path_manager_pt) (void *data); typedef ngx_msec_t (*ngx_path_purger_pt) (void *data); typedef void (*ngx_path_loader_pt) (void *data); typedef struct { ngx_str_t name; size_t len; size_t level[NGX_MAX_PATH_LEVEL]; ngx_path_manager_pt manager; ngx_path_purger_pt purger; ngx_path_loader_pt loader; void *data; u_char *conf_file; ngx_uint_t line; } ngx_path_t; typedef struct { ngx_str_t name; size_t level[NGX_MAX_PATH_LEVEL]; } ngx_path_init_t; typedef struct { ngx_file_t file; off_t offset; ngx_path_t *path; ngx_pool_t *pool; char *warn; ngx_uint_t access; unsigned log_level:8; unsigned persistent:1; unsigned clean:1; unsigned thread_write:1; } ngx_temp_file_t; typedef struct { ngx_uint_t access; ngx_uint_t path_access; time_t time; ngx_fd_t fd; unsigned create_path:1; unsigned delete_file:1; ngx_log_t *log; } ngx_ext_rename_file_t; typedef struct { off_t size; size_t buf_size; ngx_uint_t access; time_t time; ngx_log_t *log; } ngx_copy_file_t; typedef struct ngx_tree_ctx_s ngx_tree_ctx_t; typedef ngx_int_t (*ngx_tree_init_handler_pt) (void *ctx, void *prev); typedef ngx_int_t (*ngx_tree_handler_pt) (ngx_tree_ctx_t *ctx, ngx_str_t *name); struct ngx_tree_ctx_s { off_t size; off_t fs_size; ngx_uint_t access; time_t mtime; ngx_tree_init_handler_pt init_handler; ngx_tree_handler_pt file_handler; ngx_tree_handler_pt pre_tree_handler; ngx_tree_handler_pt post_tree_handler; ngx_tree_handler_pt spec_handler; void *data; size_t alloc; ngx_log_t *log; }; ngx_int_t ngx_get_full_name(ngx_pool_t *pool, ngx_str_t *prefix, ngx_str_t *name); ssize_t ngx_write_chain_to_temp_file(ngx_temp_file_t *tf, ngx_chain_t *chain); ngx_int_t ngx_create_temp_file(ngx_file_t *file, ngx_path_t *path, ngx_pool_t *pool, ngx_uint_t persistent, ngx_uint_t clean, ngx_uint_t access); void ngx_create_hashed_filename(ngx_path_t *path, u_char *file, size_t len); ngx_int_t ngx_create_path(ngx_file_t *file, ngx_path_t *path); ngx_err_t ngx_create_full_path(u_char *dir, ngx_uint_t access); ngx_int_t ngx_add_path(ngx_conf_t *cf, ngx_path_t **slot); ngx_int_t ngx_create_paths(ngx_cycle_t *cycle, ngx_uid_t user); ngx_int_t ngx_ext_rename_file(ngx_str_t *src, ngx_str_t *to, ngx_ext_rename_file_t *ext); ngx_int_t ngx_copy_file(u_char *from, u_char *to, ngx_copy_file_t *cf); ngx_int_t ngx_walk_tree(ngx_tree_ctx_t *ctx, ngx_str_t *tree); ngx_atomic_uint_t ngx_next_temp_number(ngx_uint_t collision); char *ngx_conf_set_path_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); char *ngx_conf_merge_path_value(ngx_conf_t *cf, ngx_path_t **path, ngx_path_t *prev, ngx_path_init_t *init); char *ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); extern ngx_atomic_t *ngx_temp_number; extern ngx_atomic_int_t ngx_random_number; #endif /* _NGX_FILE_H_INCLUDED_ */