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Message-ID: <b32818a591a74efd88dd920fba530a8b@AcuMS.aculab.com> Date: Fri, 3 May 2019 11:20:32 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Joel Savitz' <jsavitz@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: 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> Subject: RE: [PATCH 2/2] prctl.2: Document the new PR_GET_TASK_SIZE option From: Joel Savitz > Sent: 02 May 2019 20:13 > Add a short explanation of the new PR_GET_TASK_SIZE option for the benefit > of future generations. > > Signed-off-by: Joel Savitz <jsavitz@...hat.com> > --- > man2/prctl.2 | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/man2/prctl.2 b/man2/prctl.2 > index 06d8e13c7..35a6a3919 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 > +.\" 2019-05-02 Joel Savitz, document PR_GET_TASK_SIZE > .\" > .\" > .TH PRCTL 2 2019-03-06 "Linux" "Linux Programmer's Manual" > @@ -1375,6 +1376,14 @@ 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 "arg2" . > +Return > +.B EFAULT > +if this operation fails. > + Shouldn't this say what the value is? ISTR a recent patch to change the was the 'used to be constant' TASK_SIZE is defined. I think it might be 'The highest userspace virtual address the current process can use.' But I might be wrong. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
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