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unixbhaskar
Tux's lil' helper
Joined: 29 Nov 2007
Posts: 119
Location: India
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 Posted: Wed Sep 15, 2010 5:22 am Post subject: Strace is throwing permission denied error |
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Here what I got :
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root@bhaskar-laptop_10:40:35_Wed Sep 15:/ # strace /dev/zero
execve("/dev/zero", ["/dev/zero"], [/* 22 vars */]) = -1 EACCES ([b]Permission denied)[/b]
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) = 0xb7705000
_llseek(3, 0, 0xbffa6050, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "[b]strace: exec: Permission denied\n", 32strace: exec: Permission denied[/b]
) = 32
close(3) = 0
munmap(0xb7705000, 4096) = 0
exit_group(1) = ?
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Why this is happening??
Here is my mounts where the binary reside:
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/dev/sda1 on / type ext3 (rw,relatime,errors=continue,barrier=0,data=writeback)
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Please throw some light on it. 
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mikegpitt
Advocate
Joined: 22 May 2004
Posts: 3224
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| Posted: Wed Sep 15, 2010 2:12 pm Post subject: |
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Does the permissions denied only happen when you run `strace /dev/zero` or all the time? The reason you are receiving it in the /dev/zero example is because you can't execute /dev/zero. I get the same permissions denied on my machine as well.
| Code: | $ ls -ltr /dev/zero
crw-rw-rw- 1 root root 1, 5 Sep 14 06:24 /dev/zero
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| Code: | $ strace /dev/zero
execve("/dev/zero", ["/dev/zero"], [/* 52 vars */]) = -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, 4), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7848000
_llseek(3, 0, 0xbff8b188, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "strace: exec: Permission denied\n", 32strace: exec: Permission denied
) = 32
close(3) = 0
munmap(0xb7848000, 4096) = 0
exit_group(1) = ?
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unixbhaskar
Tux's lil' helper
Joined: 29 Nov 2007
Posts: 119
Location: India
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| Posted: Wed Sep 15, 2010 2:30 pm Post subject: |
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Sorry my mistake... I have got the desired result as I was trying to read from /dev/zero file ..so missed the cat in the command line will cause that error.Plus you can investigate with strace with any file not only with the executables.
Cheers mate!
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Musing with GNU/Linux
Lenovo Thinkpad x250
x86_64 Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz GenuineIntel GNU/Linux
RAM : 8 GB
Kernel :Latest customized kernel
OS: Gentoo/Arch/Slackware/Debian/openSUSE/Fedora
Intel 965GM Chipset |
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