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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 c983c8dea44c
children 85dea406e18f
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $USE_PERL = YES ]; then

    cat << END                                                >> $NGX_MAKEFILE

install_perl_modules:
	cd $NGX_OBJS/src/http/modules/perl && \$(MAKE) install
END

    NGX_INSTALL_PERL_MODULES=install_perl_modules

fi


case ".$NGX_SBIN_PATH" in
    ./*)
    ;;

    *)
        NGX_SBIN_PATH=$NGX_PREFIX/$NGX_SBIN_PATH
    ;;
esac


case ".$NGX_CONF_PATH" in
    ./*)
    ;;

    *)
        NGX_CONF_PATH=$NGX_PREFIX/$NGX_CONF_PATH
    ;;
esac


NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`


case ".$NGX_PID_PATH" in
    ./*)
    ;;

    *)
        NGX_PID_PATH=$NGX_PREFIX/$NGX_PID_PATH
    ;;
esac


case ".$NGX_ERROR_LOG_PATH" in
    ./* | .)
    ;;

    *)
        NGX_ERROR_LOG_PATH=$NGX_PREFIX/$NGX_ERROR_LOG_PATH
    ;;
esac


case ".$NGX_HTTP_LOG_PATH" in
    ./*)
    ;;

    *)
        NGX_HTTP_LOG_PATH=$NGX_PREFIX/$NGX_HTTP_LOG_PATH
    ;;
esac


if test -f man/nginx.8 ; then
    NGX_MAN=man/nginx.8
else
    NGX_MAN=docs/man/nginx.8
fi

if test -d html ; then
    NGX_HTML=html
else
    NGX_HTML=docs/html
fi

cat << END                                                    >> $NGX_MAKEFILE

manpage:	$NGX_OBJS/nginx.8

$NGX_OBJS/nginx.8:	$NGX_MAN $NGX_AUTO_CONFIG_H
	sed -e "s|%%PREFIX%%|$NGX_PREFIX|" \\
		-e "s|%%PID_PATH%%|$NGX_PID_PATH|" \\
		-e "s|%%CONF_PATH%%|$NGX_CONF_PATH|" \\
		-e "s|%%ERROR_LOG_PATH%%|${NGX_ERROR_LOG_PATH:-stderr}|" \\
		< $NGX_MAN > \$@

install:	$NGX_OBJS${ngx_dirsep}nginx${ngx_binext} \
		$NGX_INSTALL_PERL_MODULES
	test -d '\$(DESTDIR)$NGX_PREFIX' || mkdir -p '\$(DESTDIR)$NGX_PREFIX'

	test -d '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`' \
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`'
	test ! -f '\$(DESTDIR)$NGX_SBIN_PATH' \
		|| mv '\$(DESTDIR)$NGX_SBIN_PATH' \
			'\$(DESTDIR)$NGX_SBIN_PATH.old'
	cp $NGX_OBJS/nginx '\$(DESTDIR)$NGX_SBIN_PATH'

	test -d '\$(DESTDIR)$NGX_CONF_PREFIX' \
		|| mkdir -p '\$(DESTDIR)$NGX_CONF_PREFIX'

	cp conf/koi-win '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/koi-utf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/win-utf '\$(DESTDIR)$NGX_CONF_PREFIX'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types' \
		|| cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params' \
		|| cp conf/fastcgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi_params \
		'\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf' \
		|| cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params' \
		|| cp conf/uwsgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/uwsgi_params \
		'\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params' \
		|| cp conf/scgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/scgi_params \
		'\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PATH' \
		|| cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PATH'
	cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PREFIX/nginx.conf.default'

	test -d '\$(DESTDIR)`dirname "$NGX_PID_PATH"`' \
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_PID_PATH"`'

	test -d '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`' || \
		mkdir -p '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`'

	test -d '\$(DESTDIR)$NGX_PREFIX/html' \
		|| cp -R $NGX_HTML '\$(DESTDIR)$NGX_PREFIX'
END


if test -n "$NGX_ERROR_LOG_PATH"; then
    cat << END                                                >> $NGX_MAKEFILE

	test -d '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`' || \
		mkdir -p '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`'
END

fi


# create Makefile

cat << END >> Makefile

build:
	\$(MAKE) -f $NGX_MAKEFILE
	\$(MAKE) -f $NGX_MAKEFILE manpage

install:
	\$(MAKE) -f $NGX_MAKEFILE install

upgrade:
	$NGX_SBIN_PATH -t

	kill -USR2 \`cat $NGX_PID_PATH\`
	sleep 1
	test -f $NGX_PID_PATH.oldbin

	kill -QUIT \`cat $NGX_PID_PATH.oldbin\`
END