From: "tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@suse.de>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/fpu] x86/fpu/xstate: Use fpstate for copy_uabi_to_xstate()
Date: Thu, 21 Oct 2021 15:12:24 -0000 [thread overview]
Message-ID: <163482914451.25758.7197982542465132827.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20211013145323.233529986@linutronix.de>
The following commit has been merged into the x86/fpu branch of tip:
Commit-ID: 49e4eb4125d506937e52e10c34c8cafd93ab0ed6
Gitweb: https://git.kernel.org/tip/49e4eb4125d506937e52e10c34c8cafd93ab0ed6
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 13 Oct 2021 16:55:55 +02:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 21 Oct 2021 14:24:14 +02:00
x86/fpu/xstate: Use fpstate for copy_uabi_to_xstate()
Prepare for dynamically enabled states per task. The function needs to
retrieve the features and sizes which are valid in a fpstate
context. Retrieve them from fpstate.
Move the function declarations to the core header as they are not
required anywhere else.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211013145323.233529986@linutronix.de
---
arch/x86/include/asm/fpu/xstate.h | 12 ------------
arch/x86/kernel/fpu/core.c | 2 +-
arch/x86/kernel/fpu/regset.c | 5 ++---
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 18 ++++++++++--------
arch/x86/kernel/fpu/xstate.h | 12 ++++++++++++
6 files changed, 26 insertions(+), 25 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index fb329bb..61fcb15 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -129,20 +129,8 @@ extern void __init update_regset_xstate_info(unsigned int size,
u64 xstate_mask);
int xfeature_size(int xfeature_nr);
-int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
-int copy_sigframe_from_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
void xsaves(struct xregs_state *xsave, u64 mask);
void xrstors(struct xregs_state *xsave, u64 mask);
-enum xstate_copy_mode {
- XSTATE_COPY_FP,
- XSTATE_COPY_FX,
- XSTATE_COPY_XSAVE,
-};
-
-struct membuf;
-void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk,
- enum xstate_copy_mode mode);
-
#endif
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 04fef47..b497eca 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -222,7 +222,7 @@ int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0,
if (ustate->xsave.header.xfeatures & ~xcr0)
return -EINVAL;
- ret = copy_uabi_from_kernel_to_xstate(&kstate->regs.xsave, ustate);
+ ret = copy_uabi_from_kernel_to_xstate(kstate, ustate);
if (ret)
return ret;
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index ec77779..f8c485a 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -8,11 +8,11 @@
#include <asm/fpu/api.h>
#include <asm/fpu/signal.h>
#include <asm/fpu/regset.h>
-#include <asm/fpu/xstate.h>
#include "context.h"
#include "internal.h"
#include "legacy.h"
+#include "xstate.h"
/*
* The xstateregs_active() routine is the same as the regset_fpregs_active() routine,
@@ -168,8 +168,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
}
fpu_force_restore(fpu);
- ret = copy_uabi_from_kernel_to_xstate(&fpu->fpstate->regs.xsave,
- kbuf ?: tmpbuf);
+ ret = copy_uabi_from_kernel_to_xstate(fpu->fpstate, kbuf ?: tmpbuf);
out:
vfree(tmpbuf);
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 5aca418..935818b 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -375,7 +375,7 @@ 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(&fpregs->xsave, buf_fx))
+ if (copy_sigframe_from_user_to_xstate(fpu->fpstate, buf_fx))
return false;
} else {
if (__copy_from_user(&fpregs->fxsave, buf_fx,
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 54cc0a4..4cfd3bc 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -463,10 +463,11 @@ int xfeature_size(int xfeature_nr)
}
/* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
-static int validate_user_xstate_header(const struct xstate_header *hdr)
+static int validate_user_xstate_header(const struct xstate_header *hdr,
+ struct fpstate *fpstate)
{
/* No unknown or supervisor features may be set */
- if (hdr->xfeatures & ~xfeatures_mask_uabi())
+ if (hdr->xfeatures & ~fpstate->user_xfeatures)
return -EINVAL;
/* Userspace must use the uncompacted format */
@@ -1115,9 +1116,10 @@ static int copy_from_buffer(void *dst, unsigned int offset, unsigned int size,
}
-static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
+static int copy_uabi_to_xstate(struct fpstate *fpstate, const void *kbuf,
const void __user *ubuf)
{
+ struct xregs_state *xsave = &fpstate->regs.xsave;
unsigned int offset, size;
struct xstate_header hdr;
u64 mask;
@@ -1127,7 +1129,7 @@ static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
if (copy_from_buffer(&hdr, offset, sizeof(hdr), kbuf, ubuf))
return -EFAULT;
- if (validate_user_xstate_header(&hdr))
+ if (validate_user_xstate_header(&hdr, fpstate))
return -EINVAL;
/* Validate MXCSR when any of the related features is in use */
@@ -1182,9 +1184,9 @@ static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
* Convert from a ptrace standard-format kernel buffer to kernel XSAVE[S]
* format and copy to the target thread. Used by ptrace and KVM.
*/
-int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
+int copy_uabi_from_kernel_to_xstate(struct fpstate *fpstate, const void *kbuf)
{
- return copy_uabi_to_xstate(xsave, kbuf, NULL);
+ return copy_uabi_to_xstate(fpstate, kbuf, NULL);
}
/*
@@ -1192,10 +1194,10 @@ int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, 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 xregs_state *xsave,
+int copy_sigframe_from_user_to_xstate(struct fpstate *fpstate,
const void __user *ubuf)
{
- return copy_uabi_to_xstate(xsave, NULL, ubuf);
+ return copy_uabi_to_xstate(fpstate, NULL, ubuf);
}
static bool validate_independent_components(u64 mask)
diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index b74c595..379dbfa 100644
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -15,8 +15,20 @@ static inline void xstate_init_xcomp_bv(struct xregs_state *xsave, u64 mask)
xsave->header.xcomp_bv = mask | XCOMP_BV_COMPACTED_FORMAT;
}
+enum xstate_copy_mode {
+ XSTATE_COPY_FP,
+ XSTATE_COPY_FX,
+ XSTATE_COPY_XSAVE,
+};
+
+struct membuf;
extern void __copy_xstate_to_uabi_buf(struct membuf to, struct fpstate *fpstate,
u32 pkru_val, enum xstate_copy_mode copy_mode);
+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 void fpu__init_cpu_xstate(void);
extern void fpu__init_system_xstate(void);
next prev parent reply other threads:[~2021-10-21 15:12 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 14:55 [patch 00/21] x86/fpu: Move register state into a container struct (part 2) Thomas Gleixner
2021-10-13 14:55 ` [patch 01/21] x86/fpu: Provide struct fpstate Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 02/21] x86/fpu: Convert fpstate_init() to " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 03/21] x86/fpu: Convert restore_fpregs_from_fpstate() " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 04/21] x86/fpu: Replace KVMs xstate component clearing Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 05/21] x86/KVM: Convert to fpstate Thomas Gleixner
2021-10-13 15:11 ` Paolo Bonzini
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 06/21] x86/fpu: Convert tracing " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 07/21] x86/fpu/regset: Convert " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 08/21] x86/fpu/signal: " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 09/21] x86/fpu/core: " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 10/21] x86/math-emu: " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 11/21] x86/fpu: Remove fpu::state Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 12/21] x86/fpu: Do not leak fpstate pointer on fork Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 13/21] x86/process: Move arch_thread_struct_whitelist() out of line Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 14/21] x86/fpu: Add size and mask information to fpstate Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 15/21] x86/fpu: Use fpstate::size Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 16/21] x86/fpu/xstate: Use fpstate for os_xsave() Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 17/21] x86/fpu/xstate: Use fpstate for xsave_to_user_sigframe() Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 18/21] x86/fpu: Use fpstate in fpu_copy_kvm_uabi_to_fpstate() Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 19/21] x86/fpu: Use fpstate in __copy_xstate_to_uabi_buf() Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-13 14:55 ` [patch 20/21] x86/fpu/xstate: Use fpstate for copy_uabi_to_xstate() Thomas Gleixner
2021-10-21 15:12 ` tip-bot2 for Thomas Gleixner [this message]
2021-10-13 14:55 ` [patch 21/21] x86/fpu/signal: Use fpstate for size and features Thomas Gleixner
2021-10-14 22:51 ` [patch V2 " Thomas Gleixner
2021-10-21 15:12 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
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