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Old 12-19-2006, 03:40 PM   #1
bfreeburg
LQ Newbie
 
Registered: Dec 2006
Posts: 5

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Unhappy persistent "execve: Permission denied"


Hello,

Something has happend to our linux box (suse) and I can't figure out which ACL is breaking (or if that's the case)

If I execute
# man man
execve: Permission denied"

if I strace man man
execve("/usr/bin/man", ["man", "man"], [/* 58 vars */]) = 0
uname({sys="Linux", node="central", ...}) = 0
brk(0) = 0x804a000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=86771, ...}) = 0
old_mmap(NULL, 86771, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000
close(3) = 0
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\0pO\1\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1394943, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4002e000
old_mmap(NULL, 1150108, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x4002f000
madvise(0x4002f000, 1150108, MADV_SEQUENTIAL|0x1) = 0
old_mmap(0x40142000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x113000) = 0x40142000
old_mmap(0x40146000, 7324, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40146000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40148000
mprotect(0x40142000, 4096, PROT_READ) = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0x401486c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0x40018000, 86771) = 0
brk(0) = 0x804a000
brk(0x806b000) = 0x806b000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=2528, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40018000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2528
read(3, "", 4096) = 0
close(3) = 0
munmap(0x40018000, 4096) = 0
open("/usr/lib/locale/en_US.UTF-8/LC_CTYPE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_CTYPE", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=208464, ...}) = 0
mmap2(NULL, 208464, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40149000
close(3) = 0
open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=21544, ...}) = 0
mmap2(NULL, 21544, PROT_READ, MAP_SHARED, 3, 0) = 0x4017c000
close(3) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
socket(PF_FILE, SOCK_STREAM, 0) = 3
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
poll([{fd=3, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
writev(3, [{"\2\0\0\0\v\0\0\0\7\0\0\0", 12}, {"passwd\0", 7}], 2) = 19
poll([{fd=3, events=POLLIN|POLLERR|POLLHUP, revents=POLLIN|POLLHUP}], 1, 5000) = 1
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"passwd\0", 7}], msg_controllen=16, {cmsg_len=16, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 7
fstat64(4, {st_mode=S_IFREG|0600, st_size=217016, ...}) = 0
pread(4, "\1\0\0\0h\0\0\0\0\0\0\0\1\0\0\0[L\210E\0\0\0\0\323\0\0"..., 104, 0) = 104
mmap2(NULL, 217016, PROT_READ, MAP_SHARED, 4, 0) = 0x40182000
close(4) = 0
close(3) = 0
setregid32(62, 62) = 0
open("/proc/sys/kernel/ngroups_max", O_RDONLY) = 3
read(3, "65536\n", 31) = 6
close(3) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 3
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
poll([{fd=3, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
writev(3, [{"\2\0\0\0\f\0\0\0\6\0\0\0", 12}, {"group\0", 6}], 2) = 18
poll([{fd=3, events=POLLIN|POLLERR|POLLHUP, revents=POLLIN|POLLHUP}], 1, 5000) = 1
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"group\0", 6}], msg_controllen=16, {cmsg_len=16, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 6
fstat64(4, {st_mode=S_IFREG|0600, st_size=217016, ...}) = 0
pread(4, "\1\0\0\0h\0\0\0\2\0\0\0\1\0\0\0[L\210E\0\0\0\0\323\0\0"..., 104, 0) = 104
mmap2(NULL, 217016, PROT_READ, MAP_SHARED, 4, 0) = 0x401b7000
close(4) = 0
close(3) = 0
setgroups32(1, [62]) = 0
setreuid32(13, 13) = 0
execve("/usr/lib/man-db/man", ["man", "man"], [/* 58 vars */]) = -1 EACCES (Permission denied)
dup(2) = 3
fcntl64(3, F_GETFL) = 0x8001 (flags O_WRONLY|O_LARGEFILE)
close(3) = 0
write(2, "execve: Permission denied\n", 26execve: Permission denied
) = 26
exit_group(-22) = ?

if I # cat /boot/config-2.6.11.4-21.14-smp | grep ACL
CONFIG_EXT2_FS_POSIX_ACL=y
CONFIG_EXT3_FS_POSIX_ACL=y
CONFIG_REISERFS_FS_POSIX_ACL=y
CONFIG_JFS_POSIX_ACL=y
CONFIG_FS_POSIX_ACL=y
CONFIG_XFS_POSIX_ACL=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_NFS_ACL=y
CONFIG_NFSD_ACL=y
CONFIG_NFS_ACL_SUPPORT=y
CONFIG_GENERIC_ACL=y

The disk in question
/dev/sda6 / reiserfs acl,user_xattr 1 1

I have looked at other answers, but nothing seems to work. Help?
Blake
 
Old 12-20-2006, 09:52 PM   #2
bfreeburg
LQ Newbie
 
Registered: Dec 2006
Posts: 5

Original Poster
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Yeah, now I have a 2nd server (2.4 kernel) that apache is now no longer allowing any connections (403 errors) even after cleaning, rebuilding apache and rebooting. Similar situation:

a custom http multi-part form processor in apache was running, and then suddenly the system gets in this locked state.

Any ideas?
 
Old 12-21-2006, 11:28 AM   #3
bfreeburg
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Registered: Dec 2006
Posts: 5

Original Poster
Rep: Reputation: 0
Sure enough, that 2.4 Kernel (redhat 9) box now also doesn't like to fork. Rebooting doesn't fix the problem, I suspect something has been overwritten, but what system config stuff to look at? What variables would stop the system from forking?
 
Old 12-22-2006, 04:03 AM   #4
nx5000
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Registered: Sep 2005
Location: Out
Posts: 3,307

Rep: Reputation: 55
Try to boot on a clean machine with the same settings and compare the strace output. Sorry I don't have any clue but that's what I would do.
By the way you you have to do:
strace -f to have all information (not sure you use it) and then well, -o /tmp/strace to make post analysis.
Good luck
 
  


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