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/signal: Handle #PF in the direct restore path
Date: Wed, 23 Jun 2021 22:08:49 -0000 [thread overview]
Message-ID: <162448612941.395.11659574309358890895.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210623121457.696022863@linutronix.de>
The following commit has been merged into the x86/fpu branch of tip:
Commit-ID: fcb3635f5018e53024c6be3c3213737f469f74ff
Gitweb: https://git.kernel.org/tip/fcb3635f5018e53024c6be3c3213737f469f74ff
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 23 Jun 2021 14:02:31 +02:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 23 Jun 2021 20:05:33 +02:00
x86/fpu/signal: Handle #PF in the direct restore path
If *RSTOR raises an exception, then the slow path is taken. That's wrong
because if the reason was not #PF then going through the slow path is waste
of time because that will end up with the same conclusion that the data is
invalid.
Now that the wrapper around *RSTOR return an negative error code, which is
the negated trap number, it's possible to differentiate.
If the *RSTOR raised #PF then handle it directly in the fast path and if it
was some other exception, e.g. #GP, then give up and do not try the fast
path.
This removes the legacy frame FRSTOR code from the slow path because FRSTOR
is not a ia32_fxstate frame and is therefore handled in the fast path.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121457.696022863@linutronix.de
---
arch/x86/kernel/fpu/signal.c | 67 +++++++++++++++++------------------
1 file changed, 33 insertions(+), 34 deletions(-)
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index aa268d9..4c252d0 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -272,11 +272,17 @@ static int __restore_fpregs_from_user(void __user *buf, u64 xrestore,
}
}
-static int restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only)
+/*
+ * Attempt to restore the FPU registers directly from user memory.
+ * Pagefaults are handled and any errors returned are fatal.
+ */
+static int restore_fpregs_from_user(void __user *buf, u64 xrestore,
+ bool fx_only, unsigned int size)
{
struct fpu *fpu = ¤t->thread.fpu;
int ret;
+retry:
fpregs_lock();
pagefault_disable();
ret = __restore_fpregs_from_user(buf, xrestore, fx_only);
@@ -293,14 +299,18 @@ static int restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only
* invalidate the FPU register state otherwise the task
* might preempt current and return to user space with
* corrupted FPU registers.
- *
- * In case current owns the FPU registers then no further
- * action is required. The fixup in the slow path will
- * handle it correctly.
*/
if (test_thread_flag(TIF_NEED_FPU_LOAD))
__cpu_invalidate_fpregs_state();
fpregs_unlock();
+
+ /* Try to handle #PF, but anything else is fatal. */
+ if (ret != -EFAULT)
+ return -EINVAL;
+
+ ret = fault_in_pages_readable(buf, size);
+ if (!ret)
+ goto retry;
return ret;
}
@@ -311,9 +321,7 @@ static int restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only
*
* It would be optimal to handle this with a single XRSTORS, but
* this does not work because the rest of the FPU registers have
- * been restored from a user buffer directly. The single XRSTORS
- * happens below, when the user buffer has been copied to the
- * kernel one.
+ * been restored from a user buffer directly.
*/
if (test_thread_flag(TIF_NEED_FPU_LOAD) && xfeatures_mask_supervisor())
os_xrstor(&fpu->state.xsave, xfeatures_mask_supervisor());
@@ -326,14 +334,13 @@ static int restore_fpregs_from_user(void __user *buf, u64 xrestore, bool fx_only
static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
bool ia32_fxstate)
{
- struct user_i387_ia32_struct *envp = NULL;
int state_size = fpu_kernel_xstate_size;
struct task_struct *tsk = current;
struct fpu *fpu = &tsk->thread.fpu;
struct user_i387_ia32_struct env;
u64 user_xfeatures = 0;
bool fx_only = false;
- int ret = 0;
+ int ret;
if (use_xsave()) {
struct _fpx_sw_bytes fx_sw_user;
@@ -354,21 +361,20 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
* faults. If it does, fall back to the slow path below, going
* through the kernel buffer with the enabled pagefault handler.
*/
- ret = restore_fpregs_from_user(buf_fx, user_xfeatures, fx_only);
- if (likely(!ret))
- return 0;
- } else {
- /*
- * For 32-bit frames with fxstate, copy the fxstate so it can
- * be reconstructed later.
- */
- ret = __copy_from_user(&env, buf, sizeof(env));
- if (ret)
- return ret;
- envp = &env;
+ return restore_fpregs_from_user(buf_fx, user_xfeatures, fx_only,
+ state_size);
}
/*
+ * Copy the legacy state because the FP portion of the FX frame has
+ * to be ignored for histerical raisins. The legacy state is folded
+ * in once the larger state has been copied.
+ */
+ ret = __copy_from_user(&env, buf, sizeof(env));
+ if (ret)
+ return ret;
+
+ /*
* By setting TIF_NEED_FPU_LOAD it is ensured that our xstate is
* not modified on context switch and that the xstate is considered
* to be loaded again on return to userland (overriding last_cpu avoids
@@ -382,8 +388,7 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
* supervisor state is preserved. Save the full state for
* simplicity. There is no point in optimizing this by only
* saving the supervisor states and then shuffle them to
- * the right place in memory. This is the slow path and the
- * above XRSTOR failed or ia32_fxstate is true. Shrug.
+ * the right place in memory. It's ia32 mode. Shrug.
*/
if (xfeatures_mask_supervisor())
os_xsave(&fpu->state.xsave);
@@ -399,7 +404,7 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
if (ret)
return ret;
- sanitize_restored_user_xstate(&fpu->state, envp, user_xfeatures);
+ sanitize_restored_user_xstate(&fpu->state, &env, user_xfeatures);
fpregs_lock();
if (unlikely(init_bv))
@@ -412,12 +417,12 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
ret = os_xrstor_safe(&fpu->state.xsave,
user_xfeatures | xfeatures_mask_supervisor());
- } else if (use_fxsr()) {
+ } else {
ret = __copy_from_user(&fpu->state.fxsave, buf_fx, state_size);
if (ret)
return -EFAULT;
- sanitize_restored_user_xstate(&fpu->state, envp, user_xfeatures);
+ sanitize_restored_user_xstate(&fpu->state, &env, user_xfeatures);
fpregs_lock();
if (use_xsave()) {
@@ -428,14 +433,8 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
}
ret = fxrstor_safe(&fpu->state.fxsave);
- } else {
- ret = __copy_from_user(&fpu->state.fsave, buf_fx, state_size);
- if (ret)
- return ret;
-
- fpregs_lock();
- ret = frstor_safe(&fpu->state.fsave);
}
+
if (!ret)
fpregs_mark_activate();
else
next prev parent reply other threads:[~2021-06-23 22:08 UTC|newest]
Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-23 12:01 [patch V4 00/65] x86/fpu: Spring cleaning and PKRU sanitizing Thomas Gleixner
2021-06-23 12:01 ` [patch V4 01/65] x86/fpu: Fix copy_xstate_to_kernel() gap handling Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 02/65] x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add PKRU value to init_fpstate") Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 03/65] x86/fpu: Mark various FPU states __ro_after_init Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] x86/fpu: Mark various FPU state variables __ro_after_init tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 04/65] x86/fpu: Make xfeatures_mask_all __ro_after_init Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 05/65] x86/fpu: Get rid of fpu__get_supported_xfeatures_mask() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 06/65] x86/fpu: Remove unused get_xsave_field_ptr() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 07/65] x86/fpu: Move inlines where they belong Thomas Gleixner
2021-06-23 18:43 ` Bae, Chang Seok
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 08/65] x86/fpu: Limit xstate copy size in xstateregs_set() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 09/65] x86/fpu: Sanitize xstateregs_set() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2022-07-14 4:04 ` [patch V4 09/65] " Andrei Vagin
2022-07-25 17:47 ` Dave Hansen
2022-07-25 17:57 ` Andrei Vagin
2022-07-25 21:26 ` Dave Hansen
2022-07-28 23:32 ` Chang S. Bae
2022-08-05 12:12 ` Andrei Vagin
2022-08-05 18:24 ` Chang S. Bae
2022-08-05 18:35 ` Dave Hansen
2021-06-23 12:01 ` [patch V4 10/65] x86/fpu: Reject invalid MXCSR values in copy_kernel_to_xstate() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 11/65] x86/fpu: Simplify PTRACE_GETREGS code Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Dave Hansen
2021-06-23 12:01 ` [patch V4 12/65] x86/fpu: Rewrite xfpregs_set() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Andy Lutomirski
2021-06-23 12:01 ` [patch V4 13/65] x86/fpu: Fail ptrace() requests that try to set invalid MXCSR values Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Andy Lutomirski
2021-06-23 12:01 ` [patch V4 14/65] x86/fpu: Clean up fpregs_set() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Andy Lutomirski
2021-06-23 12:01 ` [patch V4 15/65] x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs_get() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-24 15:09 ` [PATCH] x86/fpu/xstate: Clear xstate header in copy_xstate_to_uabi_buf() again Thomas Gleixner
2021-06-24 15:41 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 16/65] x86/fpu: Use copy_xstate_to_uabi_buf() in xfpregs_get() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 17/65] x86/fpu: Use copy_xstate_to_uabi_buf() in fpregs_get() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 18/65] x86/fpu: Remove fpstate_sanitize_xstate() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 19/65] x86/fpu/regset: Move fpu__read_begin() into regset Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 20/65] x86/fpu: Move fpu__write_begin() to regset Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 21/65] x86/fpu: Get rid of using_compacted_format() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 22/65] x86/kvm: Avoid looking up PKRU in XSAVE buffer Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Dave Hansen
2021-06-23 12:01 ` [patch V4 23/65] x86/fpu: Cleanup arch_set_user_pkey_access() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 24/65] x86/fpu: Get rid of copy_supervisor_to_kernel() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 25/65] x86/fpu: Rename copy_xregs_to_kernel() and copy_kernel_to_xregs() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 26/65] x86/fpu: Rename copy_user_to_xregs() and copy_xregs_to_user() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 27/65] x86/fpu: Rename fxregs related copy functions Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] x86/fpu: Rename fxregs-related " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 28/65] x86/math-emu: Rename frstor() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 29/65] x86/fpu: Rename fregs related copy functions Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] x86/fpu: Rename fregs-related " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 30/65] x86/fpu: Rename xstate copy functions which are related to UABI Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 31/65] x86/fpu: Deduplicate copy_uabi_from_user/kernel_to_xstate() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:01 ` [patch V4 32/65] x86/fpu: Rename copy_fpregs_to_fpstate() to save_fpregs_to_fpstate() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 33/65] x86/fpu: Get rid of the FNSAVE optimization Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 34/65] x86/fpu: Rename copy_kernel_to_fpregs() to restore_fpregs_from_fpstate() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 35/65] x86/fpu: Rename initstate copy functions Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 36/65] x86/fpu: Rename "dynamic" XSTATEs to "independent" Thomas Gleixner
2021-06-23 12:02 ` [patch V4 37/65] x86/fpu/xstate: Sanitize handling of independent features Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 38/65] x86/pkeys: Move read_pkru() and write_pkru() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Dave Hansen
2021-06-23 12:02 ` [patch V4 39/65] x86/fpu: Rename and sanitize fpu__save/copy() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 40/65] x86/cpu: Sanitize X86_FEATURE_OSPKE Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 41/65] x86/pkru: Provide pkru_get_init_value() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 42/65] x86/pkru: Provide pkru_write_default() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 43/65] x86/cpu: Write the default PKRU value when enabling PKE Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 44/65] x86/fpu: Use pkru_write_default() in copy_init_fpstate_to_fpregs() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 45/65] x86/fpu: Rename fpu__clear_all() to fpu_flush_thread() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 46/65] x86/fpu: Clean up the fpu__clear() variants Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Andy Lutomirski
2021-06-23 12:02 ` [patch V4 47/65] x86/fpu: Rename __fpregs_load_activate() to fpregs_restore_userregs() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 48/65] x86/fpu: Move FXSAVE_LEAK quirk info __copy_kernel_to_fpregs() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 49/65] x86/fpu: Rename xfeatures_mask_user() to xfeatures_mask_uabi() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 50/65] x86/fpu: Dont restore PKRU in fpregs_restore_userspace() Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 51/65] x86/fpu: Add PKRU storage outside of task XSAVE buffer Thomas Gleixner
2021-06-23 22:09 ` [tip: x86/fpu] " tip-bot2 for Dave Hansen
2021-06-23 12:02 ` [patch V4 52/65] x86/fpu: Hook up PKRU into ptrace() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Dave Hansen
2021-06-23 12:02 ` [patch V4 53/65] x86/fpu: Mask PKRU from kernel XRSTOR[S] operations Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 54/65] x86/fpu: Remove PKRU handling from switch_fpu_finish() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 55/65] x86/fpu: Dont store PKRU in xstate in fpu_reset_fpstate() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] x86/fpu: Don't " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 56/65] x86/pkru: Remove xstate fiddling from write_pkru() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 57/65] x86/fpu: Mark init_fpstate __ro_after_init Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 58/65] x86/fpu/signal: Move initial checks into fpu__sig_restore() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] x86/fpu/signal: Move initial checks into fpu__restore_sig() tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 59/65] x86/fpu/signal: Remove the legacy alignment check Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 60/65] x86/fpu/signal: Sanitize the xstate check on sigframe Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 61/65] x86/fpu/signal: Sanitize copy_user_to_fpregs_zeroing() Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 62/65] x86/fpu/signal: Split out the direct restore code Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 63/65] x86/fpu: Return proper error codes from user access functions Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-23 12:02 ` [patch V4 64/65] x86/fpu/signal: Handle #PF in the direct restore path Thomas Gleixner
2021-06-23 22:08 ` tip-bot2 for Thomas Gleixner [this message]
2021-06-23 12:02 ` [patch V4 65/65] x86/fpu/signal: Let xrstor handle the features to init Thomas Gleixner
2021-06-23 22:08 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-06-25 14:50 ` [patch V4 00/65] x86/fpu: Spring cleaning and PKRU sanitizing Oliver Sang
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