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prctl.2: Add health warning 

In reality, almost every prctl interferes with assumptions that the
compiler and C library / runtime rely on.  prctl() can therefore
make userspace explode in a variety ways that are likely to be hard
to debug.

This is not obvious to the uninitiated, so add a warning.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Dave Martin 2020-05-12 17:36:47 +01:00 committed by Michael Kerrisk
parent 5aaf1385fb
commit ec5cb536b1
1 changed files with 5 additions and 0 deletions
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man2/prctl.2
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@ -66,6 +66,11 @@ prctl \- operations on a process or thread
manipulates various aspects of the behavior
of the calling thread or process.
.PP
Note that careless use of
.BR prctl ()
can confuse the userspace run-time environment,
so these operations should be used with care (if at all).
.PP
.BR prctl ()
is called with a first argument describing what to do
(with values defined in \fI<linux/prctl.h>\fP), and further