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Date: Fri, 3 May 2019 14:10:21 -0400 From: Joel Savitz <jsavitz@...hat.com> To: linux-kernel@...r.kernel.org Cc: Joel Savitz <jsavitz@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>, Waiman Long <longman@...hat.com>, Mauro Carvalho Chehab <mchehab+samsung@...nel.org>, Kristina Martsenko <kristina.martsenko@....com>, Andrew Morton <akpm@...ux-foundation.org>, Cyrill Gorcunov <gorcunov@...il.com>, Kees Cook <keescook@...omium.org>, "Gustavo A. R. Silva" <gustavo@...eddedor.com>, YueHaibing <yuehaibing@...wei.com>, Micah Morton <mortonm@...omium.org>, Yang Shi <yang.shi@...ux.alibaba.com>, Jann Horn <jannh@...gle.com>, Alexey Dobriyan <adobriyan@...il.com>, Rafael Aquini <aquini@...hat.com>, Michael Kerrisk <mtk.manpages@...il.com>, Yury Norov <yury.norov@...il.com>, David Laight <David.Laight@...lab.com> Subject: [PATCH v3 2/2] prctl.2: Document the new PR_GET_TASK_SIZE option Add a short explanation of the new PR_GET_TASK_SIZE option for the benefit of future generations. Suggested-by: David Laight <David.Laight@...lab.com> Signed-off-by: Joel Savitz <jsavitz@...hat.com> --- man2/prctl.2 | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/man2/prctl.2 b/man2/prctl.2 index 06d8e13c7..cae582726 100644 --- a/man2/prctl.2 +++ b/man2/prctl.2 @@ -49,6 +49,7 @@ .\" 2013-01-10 Kees Cook, document PR_SET_PTRACER .\" 2012-02-04 Michael Kerrisk, document PR_{SET,GET}_CHILD_SUBREAPER .\" 2014-11-10 Dave Hansen, document PR_MPX_{EN,DIS}ABLE_MANAGEMENT +.\" 2019-05-03 Joel Savitz, document PR_GET_TASK_SIZE .\" .\" .TH PRCTL 2 2019-03-06 "Linux" "Linux Programmer's Manual" @@ -1375,6 +1376,15 @@ system call on Tru64). for information on versions and architectures) Return unaligned access control bits, in the location pointed to by .IR "(unsigned int\ *) arg2" . +.TP +.B PR_GET_TASK_SIZE +Copy the value of TASK_SIZE to the userspace address in +.IR "(unsigned long\ *) arg2" . +This value represents the highest virtual address available +to the current process. Return +.B EFAULT +if this operation fails. + .SH RETURN VALUE On success, .BR PR_GET_DUMPABLE , -- 2.18.1
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