From: Kyle Huey me@kylehuey.com
commit 2c87767c35ee9744f666ccec869d5fe742c3de0a upstream
In preparation for adding PKRU handling code into copy_uabi_to_xstate(), add an argument that copy_uabi_from_kernel_to_xstate() can use to pass the canonical location of the PKRU value. For copy_sigframe_from_user_to_xstate() the kernel will actually restore the PKRU value from the fpstate, but pass in the thread_struct's pkru location anyways for consistency.
Signed-off-by: Kyle Huey me@kylehuey.com Signed-off-by: Dave Hansen dave.hansen@linux.intel.com Link: https://lore.kernel.org/all/20221115230932.7126-4-khuey%40kylehuey.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/fpu/xstate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1092,7 +1092,7 @@ static int copy_from_buffer(void *dst, u
static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf, - const void __user *ubuf) + const void __user *ubuf, u32 *pkru) { unsigned int offset, size; struct xstate_header hdr; @@ -1161,7 +1161,7 @@ static int copy_uabi_to_xstate(struct xr */ int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf, u32 *pkru) { - return copy_uabi_to_xstate(xsave, kbuf, NULL); + return copy_uabi_to_xstate(xsave, kbuf, NULL, pkru); }
/* @@ -1172,7 +1172,7 @@ int copy_uabi_from_kernel_to_xstate(stru int copy_sigframe_from_user_to_xstate(struct task_struct *tsk, const void __user *ubuf) { - return copy_uabi_to_xstate(&tsk->thread.fpu.state.xsave, NULL, ubuf); + return copy_uabi_to_xstate(&tsk->thread.fpu.state.xsave, NULL, ubuf, &tsk->thread.pkru); }
static bool validate_xsaves_xrstors(u64 mask)