Re: kern/52658: mmap() a file PaX MPROTECT can produce an unkillable process

[Kamil Rytarowski <n54%gmx.com@localhost>]

The following reply was made to PR kern/52658; it has been noted by GNATS.

From: Kamil Rytarowski <n54%gmx.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/52658: mmap() a file PaX MPROTECT can produce an unkillable
 process
Date: Fri, 27 Oct 2017 14:33:04 +0200

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 From: Kamil Rytarowski <n54%gmx.com@localhost>
 To: gnats-bugs%NetBSD.org@localhost
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 Subject: Re: kern/52658: mmap() a file PaX MPROTECT can produce an unkillable
  process
 References: <pr-kern-52658%gnats.netbsd.org@localhost>
  <20171026145527.A78017A1F3%mollari.NetBSD.org@localhost>
  <20171027123501.2944D7A20E%mollari.NetBSD.org@localhost>
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 On 27.10.2017 14:35, Christos Zoulas wrote:
 > The following reply was made to PR kern/52658; it has been noted by GNA=
 TS.
 >=20
 > From: christos%zoulas.com@localhost (Christos Zoulas)
 > To: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,=20
 > 	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, n54%gmx.com@localhost
 > Cc:=20
 > Subject: Re: kern/52658: mmap() a file PaX MPROTECT can produce an unki=
 llable process
 > Date: Fri, 27 Oct 2017 08:16:23 -0400
 >=20
 >  On Oct 27, 12:10pm, uanand009%gmail.com@localhost (Utkarsh Anand) wrote:
 >  -- Subject: Re: kern/52658: mmap() a file PaX MPROTECT can produce an =
 unkilla
 > =20
 >  |  > I told them already and nobody objected.
 > =20
 >  Also, them =3D=3D me + martin. I certainly have not seen any of that b=
 efore.
 >  Anyway, please revert the printf commit; leave the mmap as it is (we c=
 an
 >  think about changing the message later because this messes up the git
 >  conversion).
 > =20
 >  For the printf commit, please explain the problem you are trying to so=
 lve?
 >  Does syzcaller barf when it sees the inconsistent declaration of print=
 f
 >  in systm.h? Or it gets confused differently?
 > =20
 >  Thanks,
 > =20
 >  christos
 > =20
 >=20
 
 There are remaining steps:
 
 1. Add ATF tests verifying this and similar ones scenarios. For example
 the first mmap(2) argument as NULL.
 
 Please use sysctl(2) to check whether the process is executed with PaX
 MPROTECT. If it's not - skip the test verifying W|X flags.
 
 Hint: grep -r MPROTECT /usr/include/sys/sysctl.h
 
 2. Login to gnats, ask for feedback (myself) whether the problem is
 gone. I will test in it in spare time.
 
 3. Once confirmed, close the report.
 
 
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