Messages in this thread | | | Date | Sat, 25 May 2002 15:33:15 -0700 | From | A Guy Called Tyketto <> | Subject | ioctl() still problem w/2.5.18 |
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I posted this before with 2.5.8 - 2.5.16 before, but the problem still exists in 2.5.18, so I'll repost.
In 2.5.16, have any restrictions been placed on ioctl()? With 2.5.16, a non-root user is unable to use /dev/cdrom with an ide cd, to play audio cds. An strace of workbone shows this:
open("/dev/cdrom", O_RDONLY) = 3 ioctl(3, CDROMSUBCHNL, 0xbfffe814) = -1 EACCES (Permission denied) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rt_sigaction(SIGINT, {SIG_IGN}, {SIG_DFL}, 8) = 0 ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0 ioctl(0, SNDCTL_TMR_START, {B38400 opost isig -icanon -echo ...}) = 0 ioctl(0, TCGETS, {B38400 opost isig -icanon -echo ...}) = 0 write(1, "\n", 1 ) = 1 ioctl(0, SNDCTL_TMR_START, {B38400 opost isig icanon echo ...}) = 0 ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0 rt_sigaction(SIGINT, {SIG_DFL}, {SIG_IGN}, 8) = 0 munmap(0x40017000, 4096) = 0 _exit(0) = ?
Workbone is supposed to access /dev/cdrom, and then wait for user input from the number pad, to play the cd. the following strace from workbone in 2.5.7 shows this working properly:
write(1, "\33[10m\n", 6 ) = 55 open("/dev/cdrom", O_RDONLY) = 3 "..., 55 ioctl(3, CDROMSUBCHNL, 0xbfffe654) = 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ioctl(3, CDROMREADTOCHDR, 0xbfffe626) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 ioctl(3, CDROMREADTOCENTRY, 0xbfffe628) = 0 rt_sigaction(SIGINT, {SIG_IGN}, {SIG_DFL}, 8) = 0 ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
This worked as root, and with a kernel <= 2.5.13. I didn't try this with 2.5.14 or 2.5.15.
since open("/dev/cdrom", O_RDONLY) is returning as it should, It would be safe to assume that the ioctl() call is causing the problem. /dev/cdrom has permissions 0666 applied to it.
BL. -- Brad Littlejohn | Email: tyketto@wizard.com Unix Systems Administrator, | tyketto@ozemail.com.au Web + NewsMaster, BOFH.. Smeghead! :) | http://www.wizard.com/~tyketto PGP: 1024D/E319F0BF 6980 AAD6 7329 E9E6 D569 F620 C819 199A E319 F0BF
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