#20 open slave pty: Bad address open pty failed: Illegal seek

[Ralf Gross]

Hi,

I'm trying to use sudosh on my new Debian Etch server.

sudosh-1.6.3
Debian Etch (x86_amd64)

sudosh-1.6.3# src/sudosh -i
[info]: chmod 0733 directory /var/log/sudosh

drwx-wx-wx 2 root root 4096 2007-02-14 09:25 sudosh

sudosh-1.6.3# src/sudosh
open slave pty: Bad address
open pty failed: Illegal seek

Don't know what this should mean, but sudosh is not working as expected.

Ralf

[Ralf Gross]

Logged In: YES
user_id=1466476
Originator: YES

I'm just wondering if the project ist still alive?

[Nobody/Anonymous]

Logged In: NO

Hi,

I have the same problem in ia64, amd x86_64 and EM64T.

I think that the problem is in the slave terminal.

with strace you can read something like:
_____________________________________________________
_____________________________________________________
open("/var/log/sudosh/jordi-jordi-input-1175589865-dMuR6aGmwnwyRiAM", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
fstat(5, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
time([1175589865]) = 1175589865
open("/etc/localtime", O_RDONLY) = 6
fstat(6, {st_mode=S_IFREG|0644, st_size=946, ...}) = 0
fstat(6, {st_mode=S_IFREG|0644, st_size=946, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ad64e9d3000
read(6, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\10\0\0\0\10"..., 4096) = 946
close(6) = 0
munmap(0x2ad64e9d3000, 4096) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=946, ...}) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=946, ...}) = 0
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=946, ...}) = 0
socket(PF_FILE, SOCK_DGRAM, 0) = 6
fcntl(6, F_SETFD, FD_CLOEXEC) = 0
connect(6, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0
sendto(6, "<150>Apr 3 10:44:25 sudosh: sta"..., 89, MSG_NOSIGNAL, NULL, 0) = 89
close(6) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, TIOCGWINSZ, {ws_row=39, ws_col=125, ws_xpixel=0, ws_ypixel=0}) = 0
ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 -opost -isig -icanon -echo ...}) = 0
open("/dev/ptmx", O_RDWR) = 6
ioctl(6, TIOCSPTLCK, [0]) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(6, TIOCGPTN, [6]) = 0
stat("/dev/pts/6", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 6), ...}) = 0
statfs("/dev/pts/6", {f_type="DEVPTS_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(6, TIOCGPTN, [6]) = 0
stat("/dev/pts/6", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 6), ...}) = 0
open(umovestr: Input/output error
0x4ecbda90, O_RDWR) = -1 EFAULT (Bad address)
dup(2) = 7
fcntl(7, F_GETFL) = 0x8001 (flags O_WRONLY|O_LARGEFILE)
close(7) = 0
write(2, "open slave pty: Bad address\n", 28open slave pty: Bad address
) = 28
close(6) = 0
_____________________________________________________
_____________________________________________________

[Nobody/Anonymous]

Logged In: NO

This is a strange problem caused by ptsname() being given the wrong signature.

Add this line to sudosh.c and it'll work (this is a workaround, not a particularly nice fix...):

char *ptsname(int fildes);

That's the correct signature. Without it gcc treats the returned value as an integer on 64 bit platforms, and stores just 32 bits of the returned result into the pointer...

[Nobody/Anonymous]

Logged In: NO

my error is different

open slave pty: Permission denied
open pty failed: Illegal seek

any ideas ?

socket(PF_FILE, SOCK_DGRAM, 0) = 6
fcntl64(6, F_SETFD, FD_CLOEXEC) = 0
connect(6, {sa_family=AF_FILE, path="/dev/log"}, 16) = 0
send(6, "<150>Dec 9 16:08:00 sudosh: sta"..., 93, MSG_NOSIGNAL) = 93
close(6) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, TIOCGWINSZ, {ws_row=46, ws_col=169, ws_xpixel=0, ws_ypixel=0}) = 0
ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 -opost -isig -icanon -echo ...}) = 0
open("/dev/ptmx", O_RDWR) = 6
ioctl(6, TIOCSPTLCK, [0]) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(6, TIOCGPTN, [6]) = 0
stat64("/dev/pts/6", {st_mode=S_IFCHR|020, st_rdev=makedev(136, 6), ...}) = 0
statfs("/dev/pts/6", {f_type="DEVPTS_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(6, TIOCGPTN, [6]) = 0
stat64("/dev/pts/6", {st_mode=S_IFCHR|020, st_rdev=makedev(136, 6), ...}) = 0
open("/dev/pts/6", O_RDWR) = -1 EACCES (Permission denied)
dup(2) = 7
fcntl64(7, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(7, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 5), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000
_llseek(7, 0, 0xbed76968, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(7, "open slave pty: Permission denie"..., 34open slave pty: Permission denied
) = 34
close(7) = 0
munmap(0x40016000, 4096) = 0
close(6) = 0
dup(2) = 6
fcntl64(6, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(6, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 5), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000
_llseek(6, 0, 0xbed76968, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(6, "open pty failed: Illegal seek\n", 30open pty failed: Illegal seek
) = 30
close(6) = 0
munmap(0x40016000, 4096) = 0
ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 opost isig icanon echo ...}) = 0
close(4) = 0
close(3) = 0
close(5) = 0
time([1197227280]) = 1197227280
stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=276, ...}) = 0
stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=276, ...}) = 0
stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=276, ...}) = 0
socket(PF_FILE, SOCK_DGRAM, 0) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
connect(3, {sa_family=AF_FILE, path="/dev/log"}, 16) = 0
send(3, "<150>Dec 9 16:08:00 sudosh: sto"..., 70, MSG_NOSIGNAL) = 70
close(3) = 0
io_submit(0x1, 0, 0x8 <unfinished ... exit status 1>
Process 3016 detached

[Nobody/Anonymous]

Logged In: NO

I was able to get around this by configuring with

env CFLAGS="-D_GNU_SOURCE" ./configure

It appears that otherwise, gcc won't use the version of ptsname() that sudosh expects.