This is a note to let you know that I've just added the patch titled x86/fpu: Add a pkru argument to copy_uabi_from_kernel_to_xstate(). to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-fpu-add-a-pkru-argument-to-copy_uabi_from_kernel_to_xstate.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From me@xxxxxxxxxxxx Mon Jan 9 22:02:34 2023 From: Kyle Huey <me@xxxxxxxxxxxx> Date: Mon, 9 Jan 2023 13:02:10 -0800 Subject: x86/fpu: Add a pkru argument to copy_uabi_from_kernel_to_xstate(). To: stable@xxxxxxxxxxxxxxx, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Robert O'Callahan <robert@xxxxxxxxxxxxx>, David Manouchehri <david.manouchehri@xxxxxxxxxx>, Kyle Huey <me@xxxxxxxxxxxx> Message-ID: <20230109210214.71068-3-khuey@xxxxxxxxxxxx> From: Kyle Huey <me@xxxxxxxxxxxx> From: Kyle Huey <me@xxxxxxxxxxxx> commit 1c813ce03055 upstream ptrace (through PTRACE_SETREGSET with NT_X86_XSTATE) ultimately calls copy_uabi_from_kernel_to_xstate(). In preparation for eventually handling PKRU in copy_uabi_to_xstate, pass in a pointer to the PKRU location. Signed-off-by: Kyle Huey <me@xxxxxxxxxxxx> Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/all/20221115230932.7126-3-khuey%40kylehuey.com Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/fpu/xstate.h | 2 +- arch/x86/kernel/fpu/regset.c | 2 +- arch/x86/kernel/fpu/xstate.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) --- a/arch/x86/include/asm/fpu/xstate.h +++ b/arch/x86/include/asm/fpu/xstate.h @@ -136,7 +136,7 @@ extern void __init update_regset_xstate_ void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr); int xfeature_size(int xfeature_nr); -int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf); +int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf, u32 *pkru); int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, const void __user *ubuf); void xsaves(struct xregs_state *xsave, u64 mask); --- a/arch/x86/kernel/fpu/regset.c +++ b/arch/x86/kernel/fpu/regset.c @@ -163,7 +163,7 @@ int xstateregs_set(struct task_struct *t } fpu_force_restore(fpu); - ret = copy_uabi_from_kernel_to_xstate(&fpu->state.xsave, kbuf ?: tmpbuf); + ret = copy_uabi_from_kernel_to_xstate(&fpu->state.xsave, kbuf ?: tmpbuf, &target->thread.pkru); out: vfree(tmpbuf); --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1159,7 +1159,7 @@ static int copy_uabi_to_xstate(struct xr * format and copy to the target thread. This is called from * xstateregs_set(). */ -int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf) +int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf, u32 *pkru) { return copy_uabi_to_xstate(xsave, kbuf, NULL); } Patches currently in stable-queue which might be from me@xxxxxxxxxxxx are queue-5.15/x86-fpu-take-task_struct-in-copy_sigframe_from_user_to_xstate.patch queue-5.15/selftests-vm-pkeys-add-a-regression-test-for-setting-pkru-through-ptrace.patch queue-5.15/x86-fpu-emulate-xrstor-s-behavior-if-the-xfeatures-pkru-bit-is-not-set.patch queue-5.15/x86-fpu-allow-pkru-to-be-once-again-written-by-ptrace.patch queue-5.15/x86-fpu-add-a-pkru-argument-to-copy_uabi_to_xstate.patch queue-5.15/x86-fpu-add-a-pkru-argument-to-copy_uabi_from_kernel_to_xstate.patch