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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man2/seteuid.2
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-.\" Copyright (C) 2001 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" [should really be seteuid.3]
-.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Added notes on capability requirements
-.\"
-.TH seteuid 2 2024-02-11 "Linux man-pages 6.7"
-.SH NAME
-seteuid, setegid \- set effective user or group ID
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int seteuid(uid_t " euid );
-.BI "int setegid(gid_t " egid );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR seteuid (),
-.BR setegid ():
-.nf
- _POSIX_C_SOURCE >= 200112L
- || /* glibc <= 2.19: */ _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-.BR seteuid ()
-sets the effective user ID of the calling process.
-Unprivileged processes may only set the effective user ID to the
-real user ID, the effective user ID or the saved set-user-ID.
-.P
-Precisely the same holds for
-.BR setegid ()
-with "group" instead of "user".
-.\" When
-.\" .I euid
-.\" equals \-1, nothing is changed.
-.\" (This is an artifact of the implementation in glibc of seteuid()
-.\" using setresuid(2).)
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.P
-.IR Note :
-there are cases where
-.BR seteuid ()
-can fail even when the caller is UID 0;
-it is a grave security error to omit checking for a failure return from
-.BR seteuid ().
-.SH ERRORS
-.TP
-.B EINVAL
-The target user or group ID is not valid in this user namespace.
-.TP
-.B EPERM
-In the case of
-.BR seteuid ():
-the calling process is not privileged (does not have the
-.B CAP_SETUID
-capability in its user namespace) and
-.I euid
-does not match the current real user ID, current effective user ID,
-or current saved set-user-ID.
-.IP
-In the case of
-.BR setegid ():
-the calling process is not privileged (does not have the
-.B CAP_SETGID
-capability in its user namespace) and
-.I egid
-does not match the current real group ID, current effective group ID,
-or current saved set-group-ID.
-.SH VERSIONS
-Setting the effective user (group) ID to the
-saved set-user-ID (saved set-group-ID) is
-possible since Linux 1.1.37 (1.1.38).
-On an arbitrary system one should check
-.BR _POSIX_SAVED_IDS .
-.P
-Under glibc 2.0,
-.BI seteuid( euid )
-is equivalent to
-.BI setreuid(\-1, " euid" )
-and hence may change the saved set-user-ID.
-Under glibc 2.1 and later, it is equivalent to
-.BI setresuid(\-1, " euid" ", \-1)"
-and hence does not change the saved set-user-ID.
-Analogous remarks hold for
-.BR setegid (),
-with the difference that the change in implementation from
-.BI setregid(\-1, " egid" )
-to
-.BI setresgid(\-1, " egid" ", \-1)"
-occurred in glibc 2.2 or 2.3 (depending on the hardware architecture).
-.P
-According to POSIX.1,
-.BR seteuid ()
-.RB ( setegid ())
-need not permit
-.I euid
-.RI ( egid )
-to be the same value as the current effective user (group) ID,
-and some implementations do not permit this.
-.SS C library/kernel differences
-On Linux,
-.BR seteuid ()
-and
-.BR setegid ()
-are implemented as library functions that call, respectively,
-.BR setresuid (2)
-and
-.BR setresgid (2).
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.3BSD.
-.SH SEE ALSO
-.BR geteuid (2),
-.BR setresuid (2),
-.BR setreuid (2),
-.BR setuid (2),
-.BR capabilities (7),
-.BR credentials (7),
-.BR user_namespaces (7)