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Resolver: fixed use-after-free memory accesses with CNAME. When several requests were waiting for a response, then after getting a CNAME response only the last request's context had the name updated. Contexts of other requests had the wrong name. This name was used by ngx_resolve_name_done() to find the node to remove the request context from. When the name was wrong, the request could not be properly cancelled, its context was freed but stayed linked to the node's waiting list. This happened e.g. when the first request was aborted or timed out before the resolving completed. When it completed, this triggered a use-after-free memory access by calling ctx->handler of already freed request context. The bug manifests itself by "could not cancel <name> resolving" alerts in error_log. When a request was responded with a CNAME, the request context kept the pointer to the original node's rn->u.cname. If the original node expired before the resolving timed out or completed with an error, this would trigger a use-after-free memory access via ctx->name in ctx->handler(). The fix is to keep ctx->name unmodified. The name from context is no longer used by ngx_resolve_name_done(). Instead, we now keep the pointer to resolver node to which this request is linked. Keeping the original name intact also improves logging.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 26 Jan 2016 16:46:59 +0300
parents fe0ace132a25
children c8491e096e13
line wrap: on
line source


VER =		$(shell grep 'define NGINX_VERSION' src/core/nginx.h	\
			| sed -e 's/^.*"\(.*\)".*/\1/')
NGINX =		nginx-$(VER)
TEMP =		tmp

OBJS =		objs.msvc8
OPENSSL =	openssl-1.0.2e
ZLIB =		zlib-1.2.8
PCRE =		pcre-8.38


release: export

	mv $(TEMP)/$(NGINX)/auto/configure $(TEMP)/$(NGINX)

	# delete incomplete sources
	rm $(TEMP)/$(NGINX)/src/event/ngx_event_acceptex.c
	rm $(TEMP)/$(NGINX)/src/event/ngx_event_connectex.c
	rm $(TEMP)/$(NGINX)/src/event/modules/ngx_iocp_module.*
	rm -r $(TEMP)/$(NGINX)/src/os/win32

	rm -r $(TEMP)/$(NGINX)/src/mysql

	mv $(TEMP)/$(NGINX)/docs/text/LICENSE $(TEMP)/$(NGINX)
	mv $(TEMP)/$(NGINX)/docs/text/README $(TEMP)/$(NGINX)
	mv $(TEMP)/$(NGINX)/docs/html $(TEMP)/$(NGINX)
	mv $(TEMP)/$(NGINX)/docs/man $(TEMP)/$(NGINX)

	$(MAKE) -f docs/GNUmakefile changes

	rm -r $(TEMP)/$(NGINX)/docs
	rm -r $(TEMP)/$(NGINX)/misc

	tar -c -z -f $(NGINX).tar.gz --directory $(TEMP) $(NGINX)


export:
	rm -rf $(TEMP)
	hg archive -X '.hg*' $(TEMP)/$(NGINX)


RELEASE:
	hg ci -m nginx-$(VER)-RELEASE
	hg tag -m "release-$(VER) tag" release-$(VER)

	$(MAKE) -f misc/GNUmakefile release


win32:
	./auto/configure						\
		--with-cc=cl						\
		--builddir=$(OBJS)					\
		--with-debug						\
		--prefix= 						\
		--conf-path=conf/nginx.conf				\
		--pid-path=logs/nginx.pid				\
		--http-log-path=logs/access.log				\
		--error-log-path=logs/error.log				\
		--sbin-path=nginx.exe					\
		--http-client-body-temp-path=temp/client_body_temp	\
		--http-proxy-temp-path=temp/proxy_temp			\
		--http-fastcgi-temp-path=temp/fastcgi_temp		\
		--http-scgi-temp-path=temp/scgi_temp			\
		--http-uwsgi-temp-path=temp/uwsgi_temp			\
		--with-cc-opt=-DFD_SETSIZE=1024				\
		--with-pcre=$(OBJS)/lib/$(PCRE)				\
		--with-zlib=$(OBJS)/lib/$(ZLIB)				\
		--with-select_module					\
		--with-http_realip_module				\
		--with-http_addition_module				\
		--with-http_sub_module					\
		--with-http_dav_module					\
		--with-http_stub_status_module				\
		--with-http_flv_module					\
		--with-http_mp4_module					\
		--with-http_gunzip_module				\
		--with-http_gzip_static_module				\
		--with-http_auth_request_module				\
		--with-http_random_index_module				\
		--with-http_secure_link_module				\
		--with-http_slice_module				\
		--with-mail						\
		--with-stream						\
		--with-openssl=$(OBJS)/lib/$(OPENSSL)			\
		--with-openssl-opt=no-asm				\
		--with-http_ssl_module					\
		--with-mail_ssl_module					\
		--with-stream_ssl_module				\
		--with-ipv6


zip: export
	rm -f $(NGINX).zip

	mkdir -p $(TEMP)/$(NGINX)/docs.new
	mkdir -p $(TEMP)/$(NGINX)/logs
	mkdir -p $(TEMP)/$(NGINX)/temp

	sed -i '' -e "s/$$/`printf '\r'`/" $(TEMP)/$(NGINX)/conf/*

	mv $(TEMP)/$(NGINX)/docs/text/LICENSE $(TEMP)/$(NGINX)/docs.new
	mv $(TEMP)/$(NGINX)/docs/text/README $(TEMP)/$(NGINX)/docs.new
	mv $(TEMP)/$(NGINX)/docs/html $(TEMP)/$(NGINX)

	rm -r $(TEMP)/$(NGINX)/docs
	mv $(TEMP)/$(NGINX)/docs.new $(TEMP)/$(NGINX)/docs

	cp -p $(OBJS)/nginx.exe $(TEMP)/$(NGINX)

	$(MAKE) -f docs/GNUmakefile changes
	mv $(TEMP)/$(NGINX)/CHANGES* $(TEMP)/$(NGINX)/docs/

	cp -p $(OBJS)/lib/$(OPENSSL)/LICENSE				\
		$(TEMP)/$(NGINX)/docs/OpenSSL.LICENSE

	cp -p $(OBJS)/lib/$(PCRE)/LICENCE				\
		$(TEMP)/$(NGINX)/docs/PCRE.LICENCE

	sed -ne '/^ (C) 1995-20/,/^  jloup@gzip\.org/p'			\
		$(OBJS)/lib/$(ZLIB)/README				\
		> $(TEMP)/$(NGINX)/docs/zlib.LICENSE

	touch -r $(OBJS)/lib/$(ZLIB)/README				\
		$(TEMP)/$(NGINX)/docs/zlib.LICENSE

	rm -r $(TEMP)/$(NGINX)/auto
	rm -r $(TEMP)/$(NGINX)/misc
	rm -r $(TEMP)/$(NGINX)/src

	cd $(TEMP) && zip -r ../$(NGINX).zip $(NGINX)


icons:	src/os/win32/nginx.ico

# 48x48, 32x32 and 16x16 icons

src/os/win32/nginx.ico:	src/os/win32/nginx_icon48.xpm			\
			src/os/win32/nginx_icon32.xpm			\
			src/os/win32/nginx_icon16.xpm

	test -d $(TEMP) || mkdir $(TEMP)

	xpmtoppm --alphaout=$(TEMP)/nginx48.pbm				\
		src/os/win32/nginx_icon48.xpm > $(TEMP)/nginx48.ppm

	xpmtoppm --alphaout=$(TEMP)/nginx32.pbm				\
		src/os/win32/nginx_icon32.xpm > $(TEMP)/nginx32.ppm

	xpmtoppm --alphaout=$(TEMP)/nginx16.pbm				\
		src/os/win32/nginx_icon16.xpm > $(TEMP)/nginx16.ppm

	ppmtowinicon -output src/os/win32/nginx.ico -andpgms		\
		$(TEMP)/nginx48.ppm $(TEMP)/nginx48.pbm			\
		$(TEMP)/nginx32.ppm $(TEMP)/nginx32.pbm			\
		$(TEMP)/nginx16.ppm $(TEMP)/nginx16.pbm