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[Devel] Fw: Freetype2 Bug: does not work on some .gz files


From: Werner LEMBERG
Subject: [Devel] Fw: Freetype2 Bug: does not work on some .gz files
Date: Mon, 27 Jan 2003 16:19:05 +0100 (CET)

David,


here's a serious bug report regarding the gzip extension.

As a follow-up, I strongly suggest to attack FreeType 2's file loading
routines with data from rand() (together with srand() to make it
reproducible), making FT2 as stable as possible.

Is there someone volunteering to write a small test program to do
that?


    Werner

--- Begin Message --- Subject: Freetype2 Bug: does not work on some .gz files Date: Mon, 27 Jan 2003 11:56:42 +0100 User-agent: Gnus/5.090008 (Oort Gnus v0.08) XEmacs/21.4 (Native Windows TTY Support (RC1), x86_64-suse-linux)
    address@hidden:/tmp/ttt$ ls

No files there. Make an empty file with a name 3 letters long
and  try to open it with ftdump (from freetype2):

    address@hidden:/tmp/ttt$ touch 012; gzip 012; ftdump 012.gz
    Could not open face.
      error = 0x0055
    address@hidden:/tmp/ttt$

I.e. this seems to work OK, ftdump correctly recognizes that this
is not a font file and exits.

But if I make an empty file with a long enough file name, for example
10 letters


    address@hidden:/tmp/ttt$ touch 0123456789 ; gzip 0123456789; ftdump 
0123456789.gz

ftdump never returns. strace looks like this:

    address@hidden:/tmp/ttt$ strace ftdump 0123456789.gz
    execve("/usr/bin/ftdump", ["ftdump", "0123456789.gz"], [/* 71 vars */]) = 0
    uname({sys="Linux", node="magellan", ...}) = 0
    brk(0)                                  = 0x502000
    open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or 
directory)
    open("/usr/lib64/x86_64/libfreetype.so.6", O_RDONLY) = -1 ENOENT (No such 
file or directory)
    stat("/usr/lib64/x86_64", 0x7fbfffe860) = -1 ENOENT (No such file or 
directory)
    open("/usr/lib64/libfreetype.so.6", O_RDONLY) = 3
    read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\366"..., 1024) 
= 1024
    fstat(3, {st_mode=S_IFREG|0755, st_size=460474, ...}) = 0
    mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x2a95569000
    mmap(NULL, 1458456, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2a9566b000
    mprotect(0x2a956bf000, 1114392, PROT_NONE) = 0
    mmap(0x2a9576b000, 405504, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0) = 0x2a9576b000
    mmap(0x2a957ce000, 4376, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2a957ce000
    close(3)                                = 0
    open("/usr/lib64/libc.so.6", O_RDONLY)  = -1 ENOENT (No such file or 
directory)
    open("/etc/ld.so.cache", O_RDONLY)      = 3
    fstat(3, {st_mode=S_IFREG|0644, st_size=79328, ...}) = 0
    mmap(NULL, 79328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2a9556a000
    close(3)                                = 0
    open("/lib64/libc.so.6", O_RDONLY)      = 3
    read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\327"..., 1024) 
= 1024
    fstat(3, {st_mode=S_IFREG|0755, st_size=1530318, ...}) = 0
    mmap(NULL, 2362888, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2a957d0000
    mprotect(0x2a958ed000, 1195528, PROT_NONE) = 0
    mmap(0x2a959d0000, 249856, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x100000) = 0x2a959d0000
    mmap(0x2a95a0d000, 15880, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2a95a0d000
    close(3)                                = 0
    munmap(0x2a9556a000, 79328)             = 0
    brk(0)                                  = 0x502000
    brk(0x503000)                           = 0x503000
    brk(0)                                  = 0x503000
    brk(0)                                  = 0x503000
    brk(0x507000)                           = 0x507000
    brk(0)                                  = 0x507000
    brk(0x508000)                           = 0x508000
    brk(0)                                  = 0x508000
    brk(0x509000)                           = 0x509000
    brk(0)                                  = 0x509000
    brk(0x50a000)                           = 0x50a000
    open("0123456789.gz", O_RDONLY)         = 3
    fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
    fstat(3, {st_mode=S_IFREG|0644, st_size=31, ...}) = 0
    mmap(NULL, 31, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2a9556a000
    close(3)                                = 0
    brk(0)                                  = 0x50a000
    brk(0x50b000)                           = 0x50b000
    brk(0)                                  = 0x50b000
    brk(0x50c000)                           = 0x50c000
    brk(0)                                  = 0x50c000
    brk(0x50f000)                           = 0x50f000
    brk(0)                                  = 0x50f000
    brk(0x517000)                           = 0x517000
    brk(0)                                  = 0x517000
    brk(0x518000)                           = 0x518000

and here it hangs, burning CPU time.

-- 
Mike Fabian   <address@hidden>   http://www.suse.de/~mfabian
睡眠不足はいい仕事の敵だ。

--- End Message ---

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