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view auto/lib/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 d620f497c50f
children 85dea406e18f
line wrap: on
line source


# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $USE_PCRE = YES -o $PCRE != NONE ]; then
    . auto/lib/pcre/conf

else
    if [ $USE_PCRE = DISABLED -a $HTTP_REWRITE = YES ]; then

cat << END

$0: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option or you have to enable the PCRE support.

END
        exit 1
    fi
fi


if [ $USE_OPENSSL = YES ]; then
    . auto/lib/openssl/conf
fi

if [ $USE_MD5 = YES ]; then

    if [ $USE_OPENSSL = YES ]; then
        have=NGX_HAVE_OPENSSL_MD5_H . auto/have
        have=NGX_OPENSSL_MD5 . auto/have
        have=NGX_HAVE_MD5 . auto/have
        MD5=YES
        MD5_LIB=OpenSSL

    else
        . auto/lib/md5/conf
    fi

fi

if [ $USE_SHA1 = YES ]; then

    if [ $USE_OPENSSL = YES ]; then
        have=NGX_HAVE_OPENSSL_SHA1_H . auto/have
        have=NGX_HAVE_SHA1 . auto/have
        SHA1=YES
        SHA1_LIB=OpenSSL

    else
        . auto/lib/sha1/conf
    fi

fi

if [ $USE_ZLIB = YES ]; then
    . auto/lib/zlib/conf
fi

if [ $USE_LIBXSLT = YES ]; then
    . auto/lib/libxslt/conf
fi

if [ $USE_LIBGD = YES ]; then
    . auto/lib/libgd/conf
fi

if [ $USE_PERL = YES ]; then
    . auto/lib/perl/conf
fi

if [ $HTTP_GEOIP = YES ]; then
    . auto/lib/geoip/conf
fi

if [ $NGX_GOOGLE_PERFTOOLS = YES ]; then
    . auto/lib/google-perftools/conf
fi

if [ $NGX_LIBATOMIC != NO ]; then
    . auto/lib/libatomic/conf
fi