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Memcached: protect from too long responses. If a memcached response was followed by a correct trailer, and then the NUL character followed by some extra data - this was accepted by the trailer checking code. This in turn resulted in ctx->rest underflow and caused negative size buffer on the next reading from the upstream, followed by the "negative size buf in writer" alert. Fix is to always check for too long responses, so a correct trailer cannot be followed by extra data.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 06 Jul 2020 18:36:17 +0300
parents 4089b3d2cb59
children 336084ff943b 046c951e393a
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


CORE_MODULES="ngx_core_module ngx_errlog_module ngx_conf_module"

CORE_INCS="src/core"

CORE_DEPS="src/core/nginx.h \
           src/core/ngx_config.h \
           src/core/ngx_core.h \
           src/core/ngx_log.h \
           src/core/ngx_palloc.h \
           src/core/ngx_array.h \
           src/core/ngx_list.h \
           src/core/ngx_hash.h \
           src/core/ngx_buf.h \
           src/core/ngx_queue.h \
           src/core/ngx_string.h \
           src/core/ngx_parse.h \
           src/core/ngx_parse_time.h \
           src/core/ngx_inet.h \
           src/core/ngx_file.h \
           src/core/ngx_crc.h \
           src/core/ngx_crc32.h \
           src/core/ngx_murmurhash.h \
           src/core/ngx_md5.h \
           src/core/ngx_sha1.h \
           src/core/ngx_rbtree.h \
           src/core/ngx_radix_tree.h \
           src/core/ngx_rwlock.h \
           src/core/ngx_slab.h \
           src/core/ngx_times.h \
           src/core/ngx_shmtx.h \
           src/core/ngx_connection.h \
           src/core/ngx_cycle.h \
           src/core/ngx_conf_file.h \
           src/core/ngx_module.h \
           src/core/ngx_resolver.h \
           src/core/ngx_open_file_cache.h \
           src/core/ngx_crypt.h \
           src/core/ngx_proxy_protocol.h \
           src/core/ngx_syslog.h"


CORE_SRCS="src/core/nginx.c \
           src/core/ngx_log.c \
           src/core/ngx_palloc.c \
           src/core/ngx_array.c \
           src/core/ngx_list.c \
           src/core/ngx_hash.c \
           src/core/ngx_buf.c \
           src/core/ngx_queue.c \
           src/core/ngx_output_chain.c \
           src/core/ngx_string.c \
           src/core/ngx_parse.c \
           src/core/ngx_parse_time.c \
           src/core/ngx_inet.c \
           src/core/ngx_file.c \
           src/core/ngx_crc32.c \
           src/core/ngx_murmurhash.c \
           src/core/ngx_md5.c \
           src/core/ngx_sha1.c \
           src/core/ngx_rbtree.c \
           src/core/ngx_radix_tree.c \
           src/core/ngx_slab.c \
           src/core/ngx_times.c \
           src/core/ngx_shmtx.c \
           src/core/ngx_connection.c \
           src/core/ngx_cycle.c \
           src/core/ngx_spinlock.c \
           src/core/ngx_rwlock.c \
           src/core/ngx_cpuinfo.c \
           src/core/ngx_conf_file.c \
           src/core/ngx_module.c \
           src/core/ngx_resolver.c \
           src/core/ngx_open_file_cache.c \
           src/core/ngx_crypt.c \
           src/core/ngx_proxy_protocol.c \
           src/core/ngx_syslog.c"


EVENT_MODULES="ngx_events_module ngx_event_core_module"

EVENT_INCS="src/event src/event/modules"

EVENT_DEPS="src/event/ngx_event.h \
            src/event/ngx_event_timer.h \
            src/event/ngx_event_posted.h \
            src/event/ngx_event_connect.h \
            src/event/ngx_event_pipe.h"

EVENT_SRCS="src/event/ngx_event.c \
            src/event/ngx_event_timer.c \
            src/event/ngx_event_posted.c \
            src/event/ngx_event_accept.c \
            src/event/ngx_event_udp.c \
            src/event/ngx_event_connect.c \
            src/event/ngx_event_pipe.c"


SELECT_MODULE=ngx_select_module
SELECT_SRCS=src/event/modules/ngx_select_module.c
WIN32_SELECT_SRCS=src/event/modules/ngx_win32_select_module.c

POLL_MODULE=ngx_poll_module
POLL_SRCS=src/event/modules/ngx_poll_module.c
WIN32_POLL_SRCS=src/event/modules/ngx_win32_poll_module.c

KQUEUE_MODULE=ngx_kqueue_module
KQUEUE_SRCS=src/event/modules/ngx_kqueue_module.c

DEVPOLL_MODULE=ngx_devpoll_module
DEVPOLL_SRCS=src/event/modules/ngx_devpoll_module.c

EVENTPORT_MODULE=ngx_eventport_module
EVENTPORT_SRCS=src/event/modules/ngx_eventport_module.c

EPOLL_MODULE=ngx_epoll_module
EPOLL_SRCS=src/event/modules/ngx_epoll_module.c

IOCP_MODULE=ngx_iocp_module
IOCP_SRCS=src/event/modules/ngx_iocp_module.c

FILE_AIO_SRCS="src/os/unix/ngx_file_aio_read.c"
LINUX_AIO_SRCS="src/os/unix/ngx_linux_aio_read.c"

UNIX_INCS="$CORE_INCS $EVENT_INCS src/os/unix"

UNIX_DEPS="$CORE_DEPS $EVENT_DEPS \
            src/os/unix/ngx_time.h \
            src/os/unix/ngx_errno.h \
            src/os/unix/ngx_alloc.h \
            src/os/unix/ngx_files.h \
            src/os/unix/ngx_channel.h \
            src/os/unix/ngx_shmem.h \
            src/os/unix/ngx_process.h \
            src/os/unix/ngx_setaffinity.h \
            src/os/unix/ngx_setproctitle.h \
            src/os/unix/ngx_atomic.h \
            src/os/unix/ngx_gcc_atomic_x86.h \
            src/os/unix/ngx_thread.h \
            src/os/unix/ngx_socket.h \
            src/os/unix/ngx_os.h \
            src/os/unix/ngx_user.h \
            src/os/unix/ngx_dlopen.h \
            src/os/unix/ngx_process_cycle.h"

# add to UNIX_DEPS
#            src/os/unix/ngx_gcc_atomic_amd64.h \
#            src/os/unix/ngx_gcc_atomic_sparc64.h \
#            src/os/unix/ngx_gcc_atomic_ppc.h \
#            src/os/unix/ngx_sunpro_atomic_sparc64.h \
#            src/os/unix/ngx_sunpro_x86.il \
#            src/os/unix/ngx_sunpro_amd64.il \
#            src/os/unix/ngx_sunpro_sparc64.il \


UNIX_SRCS="$CORE_SRCS $EVENT_SRCS \
            src/os/unix/ngx_time.c \
            src/os/unix/ngx_errno.c \
            src/os/unix/ngx_alloc.c \
            src/os/unix/ngx_files.c \
            src/os/unix/ngx_socket.c \
            src/os/unix/ngx_recv.c \
            src/os/unix/ngx_readv_chain.c \
            src/os/unix/ngx_udp_recv.c \
            src/os/unix/ngx_send.c \
            src/os/unix/ngx_writev_chain.c \
            src/os/unix/ngx_udp_send.c \
            src/os/unix/ngx_udp_sendmsg_chain.c \
            src/os/unix/ngx_channel.c \
            src/os/unix/ngx_shmem.c \
            src/os/unix/ngx_process.c \
            src/os/unix/ngx_daemon.c \
            src/os/unix/ngx_setaffinity.c \
            src/os/unix/ngx_setproctitle.c \
            src/os/unix/ngx_posix_init.c \
            src/os/unix/ngx_user.c \
            src/os/unix/ngx_dlopen.c \
            src/os/unix/ngx_process_cycle.c"

POSIX_DEPS=src/os/unix/ngx_posix_config.h

THREAD_POOL_MODULE=ngx_thread_pool_module
THREAD_POOL_DEPS=src/core/ngx_thread_pool.h
THREAD_POOL_SRCS="src/core/ngx_thread_pool.c
                  src/os/unix/ngx_thread_cond.c
                  src/os/unix/ngx_thread_mutex.c
                  src/os/unix/ngx_thread_id.c"

FREEBSD_DEPS="src/os/unix/ngx_freebsd_config.h src/os/unix/ngx_freebsd.h"
FREEBSD_SRCS=src/os/unix/ngx_freebsd_init.c
FREEBSD_SENDFILE_SRCS=src/os/unix/ngx_freebsd_sendfile_chain.c

LINUX_DEPS="src/os/unix/ngx_linux_config.h src/os/unix/ngx_linux.h"
LINUX_SRCS=src/os/unix/ngx_linux_init.c
LINUX_SENDFILE_SRCS=src/os/unix/ngx_linux_sendfile_chain.c


SOLARIS_DEPS="src/os/unix/ngx_solaris_config.h src/os/unix/ngx_solaris.h"
SOLARIS_SRCS=src/os/unix/ngx_solaris_init.c
SOLARIS_SENDFILEV_SRCS=src/os/unix/ngx_solaris_sendfilev_chain.c


DARWIN_DEPS="src/os/unix/ngx_darwin_config.h src/os/unix/ngx_darwin.h"
DARWIN_SRCS=src/os/unix/ngx_darwin_init.c
DARWIN_SENDFILE_SRCS=src/os/unix/ngx_darwin_sendfile_chain.c


WIN32_INCS="$CORE_INCS $EVENT_INCS src/os/win32"

WIN32_DEPS="$CORE_DEPS $EVENT_DEPS \
            src/os/win32/ngx_win32_config.h \
            src/os/win32/ngx_time.h \
            src/os/win32/ngx_errno.h \
            src/os/win32/ngx_alloc.h \
            src/os/win32/ngx_files.h \
            src/os/win32/ngx_shmem.h \
            src/os/win32/ngx_process.h \
            src/os/win32/ngx_atomic.h \
            src/os/win32/ngx_thread.h \
            src/os/win32/ngx_socket.h \
            src/os/win32/ngx_os.h \
            src/os/win32/ngx_user.h \
            src/os/win32/ngx_dlopen.h \
            src/os/win32/ngx_process_cycle.h"

WIN32_CONFIG=src/os/win32/ngx_win32_config.h

WIN32_SRCS="$CORE_SRCS $EVENT_SRCS \
            src/os/win32/ngx_errno.c \
            src/os/win32/ngx_alloc.c \
            src/os/win32/ngx_files.c \
            src/os/win32/ngx_shmem.c \
            src/os/win32/ngx_time.c \
            src/os/win32/ngx_process.c \
            src/os/win32/ngx_thread.c \
            src/os/win32/ngx_socket.c \
            src/os/win32/ngx_wsarecv.c \
            src/os/win32/ngx_wsarecv_chain.c \
            src/os/win32/ngx_udp_wsarecv.c \
            src/os/win32/ngx_wsasend.c \
            src/os/win32/ngx_wsasend_chain.c \
            src/os/win32/ngx_win32_init.c \
            src/os/win32/ngx_user.c \
            src/os/win32/ngx_dlopen.c \
            src/os/win32/ngx_event_log.c \
            src/os/win32/ngx_process_cycle.c \
            src/event/ngx_event_acceptex.c"

NGX_WIN32_ICONS="src/os/win32/nginx.ico"
NGX_WIN32_RC="src/os/win32/nginx.rc"


HTTP_FILE_CACHE_SRCS=src/http/ngx_http_file_cache.c