Re: fortune bug ?
Le mardi 31 mai 2005 à 14:52 +0100, Lee Braiden a écrit :
> On Tuesday 31 May 2005 14:41, Aurélien Campéas wrote:
> > if (stat(file, &staat) == 0)
> > default:
> > perror("fortune: bad juju in is_existant");
> > exit(1);
> > Do someone knows a tool to expose the call graph of a C program ?
>
> The easiest way might be to run it through strace (strace 2>log fortune), find
> (near the end of the log) where it writes that error message, then look for
> the first stat() call before that in the same log. Hopefully it'll show what
> it's trying to access.
>
good idea !
execve("/usr/games/fortune", ["fortune"], [/* 28 vars */]) = 0
uname({sys="Linux", node="eve", ...}) = 0
brk(0) = 0x8050000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fe9000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=59815, ...}) = 0
old_mmap(NULL, 59815, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fda000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/librecode.so.0", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p/\3\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1279588, ...}) = 0
old_mmap(NULL, 1279048, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xb7ea1000
old_mmap(0xb7fac000, 188416, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x10b000) = 0xb7fac000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`Z\1\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1254468, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ea0000
old_mmap(NULL, 1264780, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xb7d6b000
old_mmap(0xb7e95000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x129000) = 0xb7e95000
old_mmap(0xb7e9e000, 7308, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7e9e000
close(3) = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7ea0800, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7fda000, 59815) = 0
stat64("fr_FR.UTF-8@euro", 0xbfffcc5c) = -1 ENOENT (No such file or directory)
open("fr_FR.UTF-8@euro", O_RDONLY) = -1 ENOENT (No such file or directory)
brk(0) = 0x8050000
brk(0x8071000) = 0x8071000
brk(0) = 0x8071000
stat64("/usr/local/share/games/fortunes/fr_FR.UTF-8@euro", 0xbfffc7ac) = -1 EACCES (Permission denied)
dup(2) = 3
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 2), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fe8000
_llseek(3, 0, 0xbfffc6a8, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "fortune: bad juju in is_existant"..., 52fortune: bad juju in is_existant: Permission denied
) = 52
close(3) = 0
munmap(0xb7fe8000, 4096) = 0
exit_group(1) = ?
a lot of crap here, but look at the last stat64 syscalls near the end :
it looks like a bug related to localisation (fortune tries to open a
file named "fr_FR.UTF ..." instead of a real file). Indeed for this
system I had the funny idea to ask for encoding of all files in UTF-8
instead of iso-latin-1 as I usually do.
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