02-02-2004
exec() system call
hi there,
i was reading about the exec() function. and if i m not wrong, exec() kills your present process and starts a new process in its place. the process id remains the same.
then it says if exec is successful the text data and stack are overlayed by new file! -
i dont get this part "only user area is maintained across exec system call"
can someone tell me what the user area is in particular? like what part of a program would be user area!?
Thank You!
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SECON(1) NSA SECON(1)
NAME
secon - See an SELinux context, from a file, program or user input.
SYNOPSIS
secon [-hVurtscmPRfLp] [CONTEXT]
[--file] FILE
[--link] FILE
[--pid] PID
DESCRIPTION
See a part of a context. The context is taken from a file, pid, user input or the context in which secon is originally executed.
-V, --version
shows the current version of secon
-h, --help
shows the usage information for secon
-P, --prompt
outputs data in a format suitable for a prompt
-u, --user
show the user of the security context
-r, --role
show the role of the security context
-t, --type
show the type of the security context
-s, --sensitivity
show the sensitivity level of the security context
-c, --clearance
show the clearance level of the security context
-m, --mls-range
show the sensitivity level and clearance, as a range, of the security context
-R, --raw
outputs the sensitivity level and clearance in an untranslated format.
-f, --file
gets the context from the specified file FILE
-L, --link
gets the context from the specified file FILE (doesn't follow symlinks)
-p, --pid
gets the context from the specified process PID
--pid-exec
gets the exec context from the specified process PID
--pid-fs
gets the fscreate context from the specified process PID
--current, --self
gets the context from the current process
--current-exec, --self-exec
gets the exec context from the current process
--current-fs, --self-fs
gets the fscreate context from the current process
--parent
gets the context from the parent of the current process
--parent-exec
gets the exec context from the parent of the current process
--parent-fs
gets the fscreate context from the parent of the current process
Additional argument CONTEXT may be provided and will be used if no options have been specified to make secon get it's context from another
source. If that argument is - then the context will be read from stdin.
If there is no arugment, secon will try reading a context from stdin, if that is not a tty, otherwise secon will act as though --self had
been passed.
If none of --user, --role, --type, --level or --mls-range is passed. Then all of them will be output.
SEE ALSO
chcon (1)
AUTHORS
James Antill (james.antill@redhat.com)
Security Enhanced Linux April 2006 SECON(1)