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ptrace.2: clarify PTRACE_O_EXITKILL 

The description in the man page is confusing; it makes it sound like
setting the PTRACE_O_EXITKILL flag on any tracee makes it so that all
tracees are killed if the tracer exits. The description from kernel
commit 992fb6e170639b that introduced PTRACE_O_EXITKILL offers a
different explanation: "If the tracer exits it sends SIGKILL to every
tracee which has this bit set".

Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Omar Sandoval 2016-12-30 10:26:54 -08:00 committed by Michael Kerrisk
parent 81ff736099
commit 14d6e62f12
1 changed files with 2 additions and 2 deletions
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@ -464,9 +464,9 @@ which are specified by the following flags:
.TP
.BR PTRACE_O_EXITKILL " (since Linux 3.8)"
.\" commit 992fb6e170639b0849bace8e49bf31bd37c4123
If a tracer sets this flag, a
Send a
.B SIGKILL
signal will be sent to every tracee if the tracer exits.
signal to the tracee if the tracer exits.
This option is useful for ptrace jailers that
want to ensure that tracees can never escape the tracer's control.
.TP