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Rewrite: fixed escaping and possible segfault (ticket #162). The following code resulted in incorrect escaping of uri and possible segfault: location / { rewrite ^(.*) $1?c=$1; return 200 "$uri"; } If there were arguments in a rewrite's replacement string, and length was actually calculated (due to duplicate captures as in the example above, or variables present), the is_args flag was set and incorrectly copied after length calculation. This resulted in escaping applied to the uri part of the replacement, resulting in incorrect escaping. Additionally, buffer was allocated without escaping expected, thus this also resulted in buffer overrun and possible segfault.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 11 May 2012 13:19:22 +0000
parents d620f497c50f
children 3d2d3e1cf427
line wrap: on
line source


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


case "$NGX_CC_NAME" in

    msvc*)
        ngx_makefile=makefile.msvc
        ngx_opt="CPU_OPT=\"$CPU_OPT\" LIBC=$LIBC"
        ngx_zlib="ZLIB=\"$ZLIB\""

    ;;

    owc*)
        ngx_makefile=makefile.owc
        ngx_opt="CPU_OPT=\"$CPU_OPT\""
        ngx_zlib=`echo ZLIB=\"$ZLIB\" | sed -e "s/\//$ngx_regex_dirsep/g"`
    ;;

    bcc)
        ngx_makefile=makefile.bcc
        ngx_opt="-DCPU_OPT=\"$CPU_OPT\""
        ngx_zlib=`echo \-DZLIB=\"$ZLIB\" | sed -e "s/\//$ngx_regex_dirsep/g"`
    ;;

esac


done=NO


case "$NGX_PLATFORM" in

    win32)
        cat << END                                            >> $NGX_MAKEFILE

`echo "$ZLIB/zlib.lib:	$NGX_MAKEFILE" | sed -e "s/\//$ngx_regex_dirsep/g"`
	\$(MAKE) -f auto/lib/zlib/$ngx_makefile $ngx_opt $ngx_zlib

END

        done=YES
    ;;

    # FreeBSD: i386
    # Linux: i686

    *:i386 | *:i686)
        case $ZLIB_ASM in
            pentium)

                cat << END                                    >> $NGX_MAKEFILE

$ZLIB/libz.a:	$NGX_MAKEFILE
	cd $ZLIB \\
	&& \$(MAKE) distclean \\
	&& cp contrib/asm586/match.S . \\
	&& CFLAGS="$ZLIB_OPT -DASMV" CC="\$(CC)" \\
		./configure \\
	&& \$(MAKE) OBJA=match.o libz.a

END

                done=YES
            ;;

            pentiumpro)

                cat << END                                    >> $NGX_MAKEFILE

$ZLIB/libz.a:	$NGX_MAKEFILE
	cd $ZLIB \\
	&& \$(MAKE) distclean \\
	&& cp contrib/asm686/match.S . \\
	&& CFLAGS="$ZLIB_OPT -DASMV" CC="\$(CC)" \\
		./configure \\
	&& \$(MAKE) OBJA=match.o libz.a

END

                done=YES
            ;;

            NO)
            ;;

            *)
                echo "$0: error: invalid --with-zlib-asm=$ZLIB_ASM option."
                echo "The valid values are \"pentium\" and \"pentiumpro\" only".
                echo

                exit 1;
            ;;
        esac
    ;;

esac


if [ $done = NO ]; then

    cat << END                                                >> $NGX_MAKEFILE

$ZLIB/libz.a:	$NGX_MAKEFILE
	cd $ZLIB \\
	&& \$(MAKE) distclean \\
	&& CFLAGS="$ZLIB_OPT" CC="\$(CC)" \\
		./configure \\
	&& \$(MAKE) libz.a

END

fi