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Top Forums Shell Programming and Scripting Process existence or/and permission Post 302999927 by bakunin on Friday 30th of June 2017 05:24:58 AM
Old 06-30-2017
To me this looks like the result of /proc having rather weird permissions. What does

Code:
ls -ld /proc

show? Because if it is flagged "0" (oct) for "others" you can't even see directory entries in there except for the ones you are directly permitted to (by their own permissions).

I just checked with a system running kernel "3.0.101-97-default" (according to uname, some old SLES, i believe) and the output was

Code:
# ls -ld /proc
dr-xr-xr-x 182 root root 0 Jun 27 20:03 /proc

So users are able to see the directory entries in there, even if they are not permitted to access them.

I hope this helps.

bakunin
 

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LSDEV(8)							Linux System Manual							  LSDEV(8)

NAME
lsdev - display information about installed hardware SYNOPSIS
lsdev DESCRIPTION
lsdev gathers information about your computer's installed hardware from the interrupts, ioports and dma files in the /proc directory, thus giving you a quick overview of which hardware uses what I/O addresses and what IRQ and DMA channels. OPTIONS
None. FILES
/proc/interrupts IRQ channels. /proc/ioports I/O memory addresses. /proc/dma DMA channels. BUGS
lsdev can't always figure out which lines in the three examined files refer to one and the same device, because these files sometimes use different names for the same piece of hardware. For example, in some kernels the keyboard is referred to as `kbd' in /proc/ioports and as `keyboard' in /proc/interrupts. This should be fixed in the kernel, not in lsdev (as has indeed happened for this particular example). The program does however try to match lines by stripping anything after a space or open parenthesis from the name, so that e.g. the `serial' lines from /proc/interrupts match the `serial(set)' lines from /proc/ioports. This attempt at DWIM might be considered a bug in itself. This program only shows the kernel's idea of what hardware is present, not what's actually physically available. SEE ALSO
procinfo(8). AUTHOR
Sander van Malssen <svm@kozmix.cistron.nl> 3rd Release 1998-05-31 LSDEV(8)
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