ladybird/Base/usr/share/man/man2/seteuid.md at ff25958b5110432afabf16d01ee2b61e39de5f37

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Liav A 5a649d0fd5 Kernel: Return EINVAL when specifying -1 for setuid and similar syscalls

For setreuid and setresuid syscalls, -1 means to set the current
uid/euid/gid/egid value, to be more convenient for programming.
However, for other syscalls where we pass only one argument, there's no
justification to specify -1.

This behavior is identical to how Linux handles the value -1, and is
influenced by the fact that the manual pages for the group of one
argument syscalls that handle ID operations is ambiguous about this
topic.

2021-12-20 11:32:16 +01:00

988 B

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Name

seteuid, setegid - set effective user / group ID

Synopsis

#include <unistd.h>

int seteuid(uid_t);
int setegid(gid_t);

Description

Sets the effective user or group ID.

For non-superusers, the effective ID can only be set to the current real or saved ID.

In particular, seteuid(geteuid()) will fail if the current effective user ID is not equal to the current real or saved ID.

Return value

If the call was set successful, returns 0. Otherwise, returns -1 and sets errno to describe the error.

Errors

EPERM: The new ID is not equal to the real ID or saved ID, and the user is not superuser.
EINVAL: The new ID is set to invalid value (-1).

988 B Raw Blame History