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

[Werner LEMBERG]

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 ---