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Range filter: protect from total size overflows. The overflow can be used to circumvent the restriction on total size of ranges introduced in c2a91088b0c0 (1.1.2). Additionally, overflow allows producing ranges with negative start (such ranges can be created by using a suffix, "bytes=-100"; normally this results in 200 due to the total size check). These can result in the following errors in logs: [crit] ... pread() ... failed (22: Invalid argument) [alert] ... sendfile() failed (22: Invalid argument) When using cache, it can be also used to reveal cache file header. It is believed that there are no other negative effects, at least with standard nginx modules. In theory, this can also result in memory disclosure and/or segmentation faults if multiple ranges are allowed, and the response is returned in a single in-memory buffer. This never happens with standard nginx modules though, as well as known 3rd party modules. Fix is to properly protect from possible overflow when incrementing size.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 11 Jul 2017 16:06:23 +0300
parents 78f8ac479735
children
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $ZLIB != NONE ]; then
    CORE_INCS="$CORE_INCS $ZLIB"

    case "$NGX_CC_NAME" in

        msvc | owc | bcc)
            have=NGX_ZLIB . auto/have
            LINK_DEPS="$LINK_DEPS $ZLIB/zlib.lib"
            CORE_LIBS="$CORE_LIBS $ZLIB/zlib.lib"
        ;;

        icc)
            have=NGX_ZLIB . auto/have
            LINK_DEPS="$LINK_DEPS $ZLIB/libz.a"

            # to allow -ipo optimization we link with the *.o but not library
            CORE_LIBS="$CORE_LIBS $ZLIB/adler32.o"
            CORE_LIBS="$CORE_LIBS $ZLIB/crc32.o"
            CORE_LIBS="$CORE_LIBS $ZLIB/deflate.o"
            CORE_LIBS="$CORE_LIBS $ZLIB/trees.o"
            CORE_LIBS="$CORE_LIBS $ZLIB/zutil.o"
            CORE_LIBS="$CORE_LIBS $ZLIB/compress.o"

            if [ $ZLIB_ASM != NO ]; then
                CORE_LIBS="$CORE_LIBS $ZLIB/match.o"
            fi
        ;;

        *)
            have=NGX_ZLIB . auto/have
            LINK_DEPS="$LINK_DEPS $ZLIB/libz.a"
            CORE_LIBS="$CORE_LIBS $ZLIB/libz.a"
            #CORE_LIBS="$CORE_LIBS -L $ZLIB -lz"
        ;;

    esac

else

    if [ "$NGX_PLATFORM" != win32 ]; then
        ZLIB=NO

        # FreeBSD, Solaris, Linux

        ngx_feature="zlib library"
        ngx_feature_name="NGX_ZLIB"
        ngx_feature_run=no
        ngx_feature_incs="#include <zlib.h>"
        ngx_feature_path=
        ngx_feature_libs="-lz"
        ngx_feature_test="z_stream z; deflate(&z, Z_NO_FLUSH)"
        . auto/feature


        if [ $ngx_found = yes ]; then
            CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
            ZLIB=YES
            ngx_found=no
        fi
    fi

    if [ $ZLIB != YES ]; then
cat << END

$0: error: the HTTP gzip module requires the zlib library.
You can either disable the module by using --without-http_gzip_module
option, or install the zlib library into the system, or build the zlib library
statically from the source with nginx by using --with-zlib=<path> option.

END
        exit 1
    fi

fi