From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: References: <20210119100402.84734-1-frankja@linux.ibm.com> <20210119100402.84734-3-frankja@linux.ibm.com> <3e1978c6-4462-1de6-e1aa-e664ffa633c1@de.ibm.com> From: Janosch Frank Subject: Re: [PATCH 2/2] s390: mm: Fix secure storage access exception handling Message-ID: <4de19c74-65dc-5a29-76c7-99c600012fdf@linux.ibm.com> Date: Tue, 19 Jan 2021 11:38:10 +0100 MIME-Version: 1.0 In-Reply-To: <3e1978c6-4462-1de6-e1aa-e664ffa633c1@de.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="uNg3fdnfVdrte67zFburezChLKBSZGmkH" List-ID: To: Christian Borntraeger , linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, thuth@redhat.com, david@redhat.com, imbrenda@linux.ibm.com, cohuck@redhat.com, linux-s390@vger.kernel.org, gor@linux.ibm.com, mihajlov@linux.ibm.com This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --uNg3fdnfVdrte67zFburezChLKBSZGmkH Content-Type: multipart/mixed; boundary="FBy55sg7hWK1ojlw3ngKTWbPIoaPsz3KO"; protected-headers="v1" From: Janosch Frank To: Christian Borntraeger , linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, thuth@redhat.com, david@redhat.com, imbrenda@linux.ibm.com, cohuck@redhat.com, linux-s390@vger.kernel.org, gor@linux.ibm.com, mihajlov@linux.ibm.com Message-ID: <4de19c74-65dc-5a29-76c7-99c600012fdf@linux.ibm.com> Subject: Re: [PATCH 2/2] s390: mm: Fix secure storage access exception handling References: <20210119100402.84734-1-frankja@linux.ibm.com> <20210119100402.84734-3-frankja@linux.ibm.com> <3e1978c6-4462-1de6-e1aa-e664ffa633c1@de.ibm.com> In-Reply-To: <3e1978c6-4462-1de6-e1aa-e664ffa633c1@de.ibm.com> --FBy55sg7hWK1ojlw3ngKTWbPIoaPsz3KO Content-Type: multipart/mixed; boundary="------------32CDE7AFDD3E53275B0DC596" Content-Language: en-US This is a multi-part message in MIME format. --------------32CDE7AFDD3E53275B0DC596 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 1/19/21 11:25 AM, Christian Borntraeger wrote: >=20 >=20 > On 19.01.21 11:04, Janosch Frank wrote: >> Turns out that the bit 61 in the TEID is not always 1 and if that's >> the case the address space ID and the address are >> unpredictable. Without an address and it's address space ID we can't >> export memory and hence we can only send a SIGSEGV to the process or >> panic the kernel depending on who caused the exception. >> >> Signed-off-by: Janosch Frank >> Fixes: 084ea4d611a3d ("s390/mm: add (non)secure page access exceptions= handlers") >> Cc: stable@vger.kernel.org >=20 > Reviewed-by: Christian Borntraeger Thanks! >=20 > some small things to consider (or to reject) >=20 >> --- >> arch/s390/mm/fault.c | 14 ++++++++++++++ >> 1 file changed, 14 insertions(+) >> >> diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c >> index e30c7c781172..5442937e5b4b 100644 >> --- a/arch/s390/mm/fault.c >> +++ b/arch/s390/mm/fault.c >> @@ -791,6 +791,20 @@ void do_secure_storage_access(struct pt_regs *reg= s) >> struct page *page; >> int rc; >> =20 >> + /* There are cases where we don't have a TEID. */ >> + if (!(regs->int_parm_long & 0x4)) { >> + /* >> + * Userspace could for example try to execute secure >> + * storage and trigger this. We should tell it that it >> + * shouldn't do that. >=20 > Maybe something like > /* > * when this happens, userspace did something that it > * was not supposed to do, e.g. branching into secure > * secure memory. Trigger a segmentation fault. >> + */ Sounds good >> + if (user_mode(regs)) { >> + send_sig(SIGSEGV, current, 0); >> + return; >> + } else >> + panic("Unexpected PGM 0x3d with TEID bit 61=3D0"); >=20 > use BUG instead of panic? That would kill this process, but it allows > people to maybe save unaffected data. 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