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Tue, 15 Apr 2025 01:26:44 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20250415-kunit-mips-v3-0-4ec2461b5a7e@linutronix.de> <20250415-kunit-mips-v3-1-4ec2461b5a7e@linutronix.de> In-Reply-To: <20250415-kunit-mips-v3-1-4ec2461b5a7e@linutronix.de> From: David Gow Date: Tue, 15 Apr 2025 16:26:30 +0800 X-Gm-Features: ATxdqUHShNA4ncH0WdvjCIFdWJT6j9Qm-Ubzv0Zw8BR9PO7gR4hhrZVuQIibV-E Message-ID: Subject: Re: [PATCH v3 1/2] MIPS: Don't crash in stack_top() for tasks without ABI or vDSO To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= Cc: Thomas Bogendoerfer , Brendan Higgins , Rae Moar , Huacai Chen , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000d431d60632cced37" --000000000000d431d60632cced37 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 15 Apr 2025 at 15:10, Thomas Wei=C3=9Fschuh wrote: > > Not all tasks have an ABI associated or vDSO mapped, > for example kthreads never do. > If such a task ever ends up calling stack_top(), it will derefence the > NULL ABI pointer and crash. > > This can for example happen when using kunit: > > mips_stack_top+0x28/0xc0 > arch_pick_mmap_layout+0x190/0x220 > kunit_vm_mmap_init+0xf8/0x138 > __kunit_add_resource+0x40/0xa8 > kunit_vm_mmap+0x88/0xd8 > usercopy_test_init+0xb8/0x240 > kunit_try_run_case+0x5c/0x1a8 > kunit_generic_run_threadfn_adapter+0x28/0x50 > kthread+0x118/0x240 > ret_from_kernel_thread+0x14/0x1c > > Only dereference the ABI point if it is set. > > Also move the randomization adjustment into the same conditional. > > Signed-off-by: Thomas Wei=C3=9Fschuh > --- This looks good to me -- we've hit what's effectively the same issue on other architectures with this test, with similar resolutions. Reviewed-by: David Gow I'm happy to have this (and the following path) go in via the KUnit tree, but if you'd rather have it go via MIPS, that's fine, too. (The qemu_configs won't generate any merge conflicts.) -- David > arch/mips/kernel/process.c | 16 +++++++++------- > 1 file changed, 9 insertions(+), 7 deletions(-) > > diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c > index b630604c577f9ff3f2493b0f254363e499c8318c..02aa6a04a21da437909eeac4f= 149155cc298f5b5 100644 > --- a/arch/mips/kernel/process.c > +++ b/arch/mips/kernel/process.c > @@ -690,18 +690,20 @@ unsigned long mips_stack_top(void) > } > > /* Space for the VDSO, data page & GIC user page */ > - top -=3D PAGE_ALIGN(current->thread.abi->vdso->size); > - top -=3D PAGE_SIZE; > - top -=3D mips_gic_present() ? PAGE_SIZE : 0; > + if (current->thread.abi) { > + top -=3D PAGE_ALIGN(current->thread.abi->vdso->size); > + top -=3D PAGE_SIZE; > + top -=3D mips_gic_present() ? PAGE_SIZE : 0; > + > + /* Space to randomize the VDSO base */ > + if (current->flags & PF_RANDOMIZE) > + top -=3D VDSO_RANDOMIZE_SIZE; > + } > > /* Space for cache colour alignment */ > if (cpu_has_dc_aliases) > top -=3D shm_align_mask + 1; > > - /* Space to randomize the VDSO base */ > - if (current->flags & PF_RANDOMIZE) > - top -=3D VDSO_RANDOMIZE_SIZE; > - > return top; > } > > > -- > 2.49.0 > --000000000000d431d60632cced37 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIUnQYJKoZIhvcNAQcCoIIUjjCCFIoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ghIEMIIGkTCCBHmgAwIBAgIQfofDAVIq0iZG5Ok+mZCT2TANBgkqhkiG9w0BAQwFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSNjETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMzA0MTkwMzUzNDdaFw0zMjA0MTkwMDAwMDBaMFQxCzAJBgNVBAYT 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