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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 639e48c382a6
children e4c21e417277
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo "checking for $NGX_SYSTEM specific features"

case "$NGX_PLATFORM" in

    FreeBSD:*)
        . auto/os/freebsd
    ;;

    Linux:*)
        . auto/os/linux
    ;;

    SunOS:*)
        . auto/os/solaris
    ;;

    Darwin:*)
        . auto/os/darwin
    ;;

    win32)
        . auto/os/win32
    ;;

    DragonFly:*)
        have=NGX_FREEBSD . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $FREEBSD_DEPS"
        CORE_SRCS="$UNIX_SRCS $FREEBSD_SRCS"

        echo " + sendfile() found"
        have=NGX_HAVE_SENDFILE . auto/have
        CORE_SRCS="$CORE_SRCS $FREEBSD_SENDFILE_SRCS"

        ngx_spacer='
'
    ;;

    NetBSD:*)
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"

        NGX_RPATH=YES
    ;;

    HP-UX:*)
        # HP/UX
        have=NGX_HPUX . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_HPUX_ALT_XOPEN_SOCKET_API"
    ;;

    OSF1:*)
        # Tru64 UNIX
        have=NGX_TRU64 . auto/have_headers
        have=NGX_HAVE_STRERROR_R . auto/nohave
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
    ;;

    GNU:*)
        # GNU Hurd
        have=NGX_GNU_HURD . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
    ;;

    *)
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
    ;;

esac


case "$NGX_MACHINE" in

    i386 | i686 | i86pc)
        have=NGX_HAVE_NONALIGNED . auto/have
        NGX_MACH_CACHE_LINE=32
    ;;

    amd64 | x86_64)
        have=NGX_HAVE_NONALIGNED . auto/have
        NGX_MACH_CACHE_LINE=64
    ;;

    sun4u | sun4v | sparc | sparc64)
        have=NGX_ALIGNMENT value=16 . auto/define
        # TODO
        NGX_MACH_CACHE_LINE=64
    ;;

    ia64 )
        have=NGX_ALIGNMENT value=16 . auto/define
        # TODO
        NGX_MACH_CACHE_LINE=64
    ;;

    *)
        have=NGX_ALIGNMENT value=16 . auto/define
        NGX_MACH_CACHE_LINE=32
    ;;

esac

if test -z "$NGX_CPU_CACHE_LINE"; then
    NGX_CPU_CACHE_LINE=$NGX_MACH_CACHE_LINE
fi

have=NGX_CPU_CACHE_LINE value=$NGX_CPU_CACHE_LINE . auto/define