diff options
Diffstat (limited to 'lib/libc/sys/kill.2')
| -rw-r--r-- | lib/libc/sys/kill.2 | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/lib/libc/sys/kill.2 b/lib/libc/sys/kill.2 index 0389559..98c3050 100644 --- a/lib/libc/sys/kill.2 +++ b/lib/libc/sys/kill.2 @@ -64,11 +64,19 @@ This can be used to check the validity of For a process to have permission to send a signal to a process designated by .Fa pid , -the real or effective user ID of the receiving process must match -that of the sending process or the user must have appropriate privileges -(such as given by a set-user-ID program or the user is the super-user). +the user must be the super-user, or +the real or saved user ID of the receiving process must match +the real or effective user ID of the sending process. A single exception is the signal SIGCONT, which may always be sent -to any process with the same session ID as the caller. +to any process with the same session ID as the sender. +In addition, if the +.Va security.bsd.conservative_signals +.Xr sysctl +is set to 1, the user is not a super-user, and +the receiver is set-uid, then +only job control and terminal control signals may +be sent (in particular, only SIGKILL, SIGINT, SIGTERM, SIGALRM, +SIGSTOP, SIGTTIN, SIGTTOU, SIGTSTP, SIGHUP, SIGUSR1, SIGUSR2). .Bl -tag -width Ds .It \&If Fa pid No \&is greater than zero : The @@ -124,10 +132,9 @@ is not a valid signal number. No process or process group can be found corresponding to that specified by .Fa pid . .It Bq Er EPERM -The sending process is not the super-user and its effective -user id does not match the effective user-id of the receiving process. -When signaling a process group, this error is returned if any members -of the group could not be signaled. +The sending process does not have permission to send +.Va sig +to the receiving process. .El .Sh SEE ALSO .Xr getpgrp 2 , |
