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view auto/lib/perl/conf @ 6359:dac6eda40475 stable-1.8

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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 dde2ae4701e1
children 7e241b36819d
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo "checking for perl"


NGX_PERL_VER=`$NGX_PERL -v 2>&1 | grep '^This is perl' 2>&1 \
                                | sed -e 's/^This is perl, \(.*\)/\1/'`

if test -n "$NGX_PERL_VER"; then
    echo " + perl version: $NGX_PERL_VER"

    if [ "`$NGX_PERL -e 'use 5.006001; print "OK"'`" != "OK" ]; then
        echo
        echo "$0: error: perl 5.6.1 or higher is required"
        echo

        exit 1;
    fi

    if [ "`$NGX_PERL -MExtUtils::Embed -e 'print "OK"'`" != "OK" ]; then
        echo
        echo "$0: error: perl module ExtUtils::Embed is required"
        echo

        exit 1;
    fi

    NGX_PERL_CFLAGS="$CFLAGS `$NGX_PERL -MExtUtils::Embed -e ccopts`"
    NGX_PM_CFLAGS=`$NGX_PERL -MExtUtils::Embed -e ccopts`

    # gcc 4.1/4.2 warn about unused values in pTHX_
    NGX_PERL_CFLAGS=`echo $NGX_PERL_CFLAGS \
                     | sed -e 's/-Wunused-value/-Wno-unused-value/'`
    # icc8 warns 'declaration hides parameter "my_perl"' in ENTER and LEAVE
    NGX_PERL_CFLAGS=`echo $NGX_PERL_CFLAGS \
                     | sed -e 's/-wd171/-wd171 -wd1599/'`

    ngx_perl_ldopts=`$NGX_PERL -MExtUtils::Embed -e ldopts`

    ngx_perl_dlext=`$NGX_PERL -MConfig -e 'print $Config{dlext}'`
    ngx_perl_libdir="src/http/modules/perl/blib/arch/auto"
    ngx_perl_module="$ngx_perl_libdir/nginx/nginx.$ngx_perl_dlext"

    if $NGX_PERL -V:usemultiplicity | grep define > /dev/null; then
        have=NGX_HAVE_PERL_MULTIPLICITY . auto/have
        echo " + perl interpreter multiplicity found"
    fi

    if $NGX_PERL -V:useithreads | grep undef > /dev/null; then
        # FreeBSD port wants to link with -pthread non-threaded perl
        ngx_perl_ldopts=`echo $ngx_perl_ldopts | sed 's/ -pthread//'`
    fi

    if [ "$NGX_SYSTEM" = "Darwin" ]; then
        # OS X system perl wants to link universal binaries
        ngx_perl_ldopts=`echo $ngx_perl_ldopts \
                         | sed -e 's/-arch x86_64 -arch i386//'`
    fi

    CORE_LINK="$CORE_LINK $ngx_perl_ldopts"
    LINK_DEPS="$LINK_DEPS $NGX_OBJS/$ngx_perl_module"

    if test -n "$NGX_PERL_MODULES"; then
        have=NGX_PERL_MODULES value="(u_char *) \"$NGX_PERL_MODULES\""
        . auto/define
        NGX_PERL_MODULES_MAN=$NGX_PERL_MODULES/man3
    fi

else
    echo
    echo "$0: error: perl 5.6.1 or higher is required"
    echo

    exit 1;
fi