Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support
On Mon, 15 Mar 2021 13:20:10 +, Vincenzo Frascino wrote: > This patchset implements the asynchronous mode support for ARMv8.5-A > Memory Tagging Extension (MTE), which is a debugging feature that allows > to detect with the help of the architecture the C and C++ programmatic > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > subset of its address space that is multiple of a 16 bytes granule. MTE > is based on a lock-key mechanism where the lock is the tag associated to > the physical memory and the key is the tag associated to the virtual > address. > When MTE is enabled and tags are set for ranges of address space of a task, > the PE will compare the tag related to the physical memory with the tag > related to the virtual address (tag check operation). Access to the memory > is granted only if the two tags match. In case of mismatch the PE will raise > an exception. > > [...] Applied to arm64 (for-next/mte-async-kernel-mode) but with a note that I'll drop them if Andrew prefers to take the patches via the mm tree. Thanks! [1/9] arm64: mte: Add asynchronous mode support https://git.kernel.org/arm64/c/f3b7deef8dca [2/9] kasan: Add KASAN mode kernel parameter https://git.kernel.org/arm64/c/2603f8a78dfb [3/9] arm64: mte: Drop arch_enable_tagging() https://git.kernel.org/arm64/c/c137c6145b11 [4/9] kasan: Add report for async mode https://git.kernel.org/arm64/c/8f7b5054755e [5/9] arm64: mte: Enable TCO in functions that can read beyond buffer limits https://git.kernel.org/arm64/c/e60beb95c08b [6/9] arm64: mte: Conditionally compile mte_enable_kernel_*() https://git.kernel.org/arm64/c/d8969752cc4e [7/9] arm64: mte: Enable async tag check fault https://git.kernel.org/arm64/c/65812c6921cc [8/9] arm64: mte: Report async tag faults before suspend https://git.kernel.org/arm64/c/eab0e6e17d87 [9/9] kasan, arm64: tests supports for HW_TAGS async mode https://git.kernel.org/arm64/c/e80a76aa1a91 -- Catalin
Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support
On Thu, Mar 18, 2021 at 06:56:07PM +, Catalin Marinas wrote:
> On Mon, Mar 15, 2021 at 01:20:10PM +, Vincenzo Frascino wrote:
> > This patchset implements the asynchronous mode support for ARMv8.5-A
> > Memory Tagging Extension (MTE), which is a debugging feature that allows
> > to detect with the help of the architecture the C and C++ programmatic
> > memory errors like buffer overflow, use-after-free, use-after-return, etc.
> >
> > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI
> > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any
> > subset of its address space that is multiple of a 16 bytes granule. MTE
> > is based on a lock-key mechanism where the lock is the tag associated to
> > the physical memory and the key is the tag associated to the virtual
> > address.
> > When MTE is enabled and tags are set for ranges of address space of a task,
> > the PE will compare the tag related to the physical memory with the tag
> > related to the virtual address (tag check operation). Access to the memory
> > is granted only if the two tags match. In case of mismatch the PE will raise
> > an exception.
> >
> > The exception can be handled synchronously or asynchronously. When the
> > asynchronous mode is enabled:
> > - Upon fault the PE updates the TFSR_EL1 register.
> > - The kernel detects the change during one of the following:
> > - Context switching
> > - Return to user/EL0
> > - Kernel entry from EL1
> > - Kernel exit to EL1
> > - If the register has been updated by the PE the kernel clears it and
> > reports the error.
> >
> > The series is based on linux-next/akpm.
>
> Andrew, could you please pick these patches up via the mm tree? They
> depend on kasan patches already queued.
Andrew, are you ok for me to queue these patches via the arm64 tree for
5.13 or you'd rather take them in the mm tree? There is a conflict with
the mm tree in lib/test_kasan.c, I think commit ce816b430b5a ("kasan:
detect false-positives in tests").
Thanks.
--
Catalin
Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support
On Thu, Mar 18, 2021 at 7:56 PM Catalin Marinas wrote: > > On Mon, Mar 15, 2021 at 01:20:10PM +, Vincenzo Frascino wrote: > > This patchset implements the asynchronous mode support for ARMv8.5-A > > Memory Tagging Extension (MTE), which is a debugging feature that allows > > to detect with the help of the architecture the C and C++ programmatic > > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > > subset of its address space that is multiple of a 16 bytes granule. MTE > > is based on a lock-key mechanism where the lock is the tag associated to > > the physical memory and the key is the tag associated to the virtual > > address. > > When MTE is enabled and tags are set for ranges of address space of a task, > > the PE will compare the tag related to the physical memory with the tag > > related to the virtual address (tag check operation). Access to the memory > > is granted only if the two tags match. In case of mismatch the PE will raise > > an exception. > > > > The exception can be handled synchronously or asynchronously. When the > > asynchronous mode is enabled: > > - Upon fault the PE updates the TFSR_EL1 register. > > - The kernel detects the change during one of the following: > > - Context switching > > - Return to user/EL0 > > - Kernel entry from EL1 > > - Kernel exit to EL1 > > - If the register has been updated by the PE the kernel clears it and > > reports the error. > > > > The series is based on linux-next/akpm. > > Andrew, could you please pick these patches up via the mm tree? They > depend on kasan patches already queued. Hi Andrew, Looks like these patches have reached a stable state. Could you please pick them up into mm targeting 5.13? Thanks!
Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support
On Thu, Mar 18, 2021 at 7:56 PM Catalin Marinas wrote: > > On Mon, Mar 15, 2021 at 01:20:10PM +, Vincenzo Frascino wrote: > > This patchset implements the asynchronous mode support for ARMv8.5-A > > Memory Tagging Extension (MTE), which is a debugging feature that allows > > to detect with the help of the architecture the C and C++ programmatic > > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > > subset of its address space that is multiple of a 16 bytes granule. MTE > > is based on a lock-key mechanism where the lock is the tag associated to > > the physical memory and the key is the tag associated to the virtual > > address. > > When MTE is enabled and tags are set for ranges of address space of a task, > > the PE will compare the tag related to the physical memory with the tag > > related to the virtual address (tag check operation). Access to the memory > > is granted only if the two tags match. In case of mismatch the PE will raise > > an exception. > > > > The exception can be handled synchronously or asynchronously. When the > > asynchronous mode is enabled: > > - Upon fault the PE updates the TFSR_EL1 register. > > - The kernel detects the change during one of the following: > > - Context switching > > - Return to user/EL0 > > - Kernel entry from EL1 > > - Kernel exit to EL1 > > - If the register has been updated by the PE the kernel clears it and > > reports the error. > > > > The series is based on linux-next/akpm. > > Andrew, could you please pick these patches up via the mm tree? They > depend on kasan patches already queued. > > Andrey, all the kasan patches have your acked-by with the google.com > address and you've been cc'ed on that. You may want to update the > .mailmap file in the kernel. Good point. I was wondering if there's something like that for email changes. Will send a patch. Thank you, Catalin.
Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support
On Mon, Mar 15, 2021 at 01:20:10PM +, Vincenzo Frascino wrote: > This patchset implements the asynchronous mode support for ARMv8.5-A > Memory Tagging Extension (MTE), which is a debugging feature that allows > to detect with the help of the architecture the C and C++ programmatic > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > subset of its address space that is multiple of a 16 bytes granule. MTE > is based on a lock-key mechanism where the lock is the tag associated to > the physical memory and the key is the tag associated to the virtual > address. > When MTE is enabled and tags are set for ranges of address space of a task, > the PE will compare the tag related to the physical memory with the tag > related to the virtual address (tag check operation). Access to the memory > is granted only if the two tags match. In case of mismatch the PE will raise > an exception. > > The exception can be handled synchronously or asynchronously. When the > asynchronous mode is enabled: > - Upon fault the PE updates the TFSR_EL1 register. > - The kernel detects the change during one of the following: > - Context switching > - Return to user/EL0 > - Kernel entry from EL1 > - Kernel exit to EL1 > - If the register has been updated by the PE the kernel clears it and > reports the error. > > The series is based on linux-next/akpm. Andrew, could you please pick these patches up via the mm tree? They depend on kasan patches already queued. Andrey, all the kasan patches have your acked-by with the google.com address and you've been cc'ed on that. You may want to update the .mailmap file in the kernel. Thanks. -- Catalin
