This is a note to let you know that I've just added the patch titled
x86/fpu: Take task_struct* in copy_sigframe_from_user_to_xstate()
to the 6.1-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-take-task_struct-in-copy_sigframe_from_user_to_xstate.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6a877d2450ace4f27c012519e5a1ae818f931983 Mon Sep 17 00:00:00 2001
From: Kyle Huey <me@xxxxxxxxxxxx>
Date: Tue, 15 Nov 2022 15:09:27 -0800
Subject: x86/fpu: Take task_struct* in copy_sigframe_from_user_to_xstate()
From: Kyle Huey <me@xxxxxxxxxxxx>
commit 6a877d2450ace4f27c012519e5a1ae818f931983 upstream.
This will allow copy_sigframe_from_user_to_xstate() to grab the address of
thread_struct's pkru value in a later patch.
Signed-off-by: Kyle Huey <me@xxxxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20221115230932.7126-2-khuey%40kylehuey.com
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 4 ++--
arch/x86/kernel/fpu/xstate.h | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -396,7 +396,7 @@ static bool __fpu_restore_sig(void __use
fpregs = &fpu->fpstate->regs;
if (use_xsave() && !fx_only) {
- if (copy_sigframe_from_user_to_xstate(fpu->fpstate, buf_fx))
+ if (copy_sigframe_from_user_to_xstate(tsk, buf_fx))
return false;
} else {
if (__copy_from_user(&fpregs->fxsave, buf_fx,
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1278,10 +1278,10 @@ int copy_uabi_from_kernel_to_xstate(stru
* XSAVE[S] format and copy to the target thread. This is called from the
* sigreturn() and rt_sigreturn() system calls.
*/
-int copy_sigframe_from_user_to_xstate(struct fpstate *fpstate,
+int copy_sigframe_from_user_to_xstate(struct task_struct *tsk,
const void __user *ubuf)
{
- return copy_uabi_to_xstate(fpstate, NULL, ubuf);
+ return copy_uabi_to_xstate(tsk->thread.fpu.fpstate, NULL, ubuf);
}
static bool validate_independent_components(u64 mask)
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -47,7 +47,7 @@ extern void __copy_xstate_to_uabi_buf(st
extern void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk,
enum xstate_copy_mode mode);
extern int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf);
-extern int copy_sigframe_from_user_to_xstate(struct fpstate *fpstate, const void __user *ubuf);
+extern int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, const void __user *ubuf);
extern void fpu__init_cpu_xstate(void);
Patches currently in stable-queue which might be from me@xxxxxxxxxxxx are
queue-6.1/x86-fpu-take-task_struct-in-copy_sigframe_from_user_to_xstate.patch
queue-6.1/selftests-vm-pkeys-add-a-regression-test-for-setting-pkru-through-ptrace.patch
queue-6.1/x86-fpu-emulate-xrstor-s-behavior-if-the-xfeatures-pkru-bit-is-not-set.patch
queue-6.1/x86-fpu-allow-pkru-to-be-once-again-written-by-ptrace.patch
queue-6.1/x86-fpu-add-a-pkru-argument-to-copy_uabi_to_xstate.patch
queue-6.1/x86-fpu-add-a-pkru-argument-to-copy_uabi_from_kernel_to_xstate.patch
