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x86/fpu: Take task_struct* in copy_sigframe_from_user_to_xstate()

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commit 6a877d2450 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@kylehuey.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20221115230932.7126-2-khuey%40kylehuey.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kyle Huey
2022-11-15 15:09:27 -08:00
committed by Greg Kroah-Hartman
parent 763b925687
commit f28418b06f
3 changed files with 4 additions and 4 deletions
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2
arch/x86/kernel/fpu/signal.c
View File

@@ -396,7 +396,7 @@ static bool __fpu_restore_sig(void __user *buf, void __user *buf_fx,
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,

4
arch/x86/kernel/fpu/xstate.c
View File

@@ -1278,10 +1278,10 @@ int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf)
* 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)

2
arch/x86/kernel/fpu/xstate.h
View File

@@ -47,7 +47,7 @@ extern void __copy_xstate_to_uabi_buf(struct membuf to, struct fpstate *fpstate,
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);