avc_context_to_sid(3) — Linux manual page


avc_context_to_sid(3)   SELinux API documentation  avc_context_to_sid(3)

NAME         top

       avc_context_to_sid, avc_sid_to_context, avc_get_initial_sid -
       obtain and manipulate SELinux security ID's

SYNOPSIS         top

       #include <selinux/selinux.h>
       #include <selinux/avc.h>

       int avc_context_to_sid(char *ctx, security_id_t *sid);

       int avc_sid_to_context(security_id_t sid, char **ctx);

       int avc_get_initial_sid(const char *name, security_id_t *sid);

DESCRIPTION         top

       Security ID's (SID's) are opaque representations of security
       contexts, managed by the userspace AVC.

       avc_context_to_sid() returns a SID for the given context in the
       memory referenced by sid.

       avc_sid_to_context() returns a copy of the context represented by
       sid in the memory referenced by ctx.  The user must free the copy
       with freecon(3).

       avc_get_initial_sid() returns a SID for the kernel initial
       security identifier specified by name.

RETURN VALUE         top

       avc_context_to_sid() and avc_sid_to_context() return zero on
       success.  On error, -1 is returned and errno is set

ERRORS         top

       ENOMEM An attempt to allocate memory failed.

NOTES         top

       As of libselinux version 2.0.86, SID's are no longer reference
       counted.  A SID will be valid from the time it is first obtained
       until the next call to avc_destroy(3).  The sidget(3) and
       sidput(3) functions, formerly used to adjust the reference count,
       are no-ops and are deprecated.

AUTHOR         top

       Eamon Walsh <ewalsh@tycho.nsa.gov>

SEE ALSO         top

       avc_init(3), avc_has_perm(3), avc_cache_stats(3),
       avc_add_callback(3), getcon(3), freecon(3), selinux(8)

COLOPHON         top

       This page is part of the selinux (Security-Enhanced Linux user-
       space libraries and tools) project.  Information about the
       project can be found at 
       ⟨https://github.com/SELinuxProject/selinux/wiki⟩.  If you have a
       bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/SELinuxProject/selinux⟩ on 2024-06-14.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2023-05-11.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
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       (which is not part of the original manual page), send a mail to

                               27 May 2004         avc_context_to_sid(3)

Pages that refer to this page: avc_add_callback(3)avc_cache_stats(3)avc_compute_create(3)avc_context_to_sid(3)avc_has_perm(3)avc_open(3)