From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Tony Luck <tony.luck@intel.com>,
Yu-cheng Yu <yu-cheng.yu@intel.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Borislav Petkov <bp@suse.de>,
Peter Zijlstra <peterz@infradead.org>,
Kan Liang <kan.liang@linux.intel.com>
Subject: [patch V2 17/52] x86/fpu: Remove fpstate_sanitize_xstate()
Date: Mon, 14 Jun 2021 17:44:25 +0200 [thread overview]
Message-ID: <20210614155355.450669490@linutronix.de> (raw)
In-Reply-To: 20210614154408.673478623@linutronix.de
No more users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: New patch
---
arch/x86/include/asm/fpu/internal.h | 2
arch/x86/kernel/fpu/xstate.c | 79 ------------------------------------
2 files changed, 81 deletions(-)
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -87,8 +87,6 @@ extern void fpstate_init_soft(struct swr
static inline void fpstate_init_soft(struct swregs_state *soft) {}
#endif
-extern void fpstate_sanitize_xstate(struct fpu *fpu);
-
#define user_insn(insn, output, input...) \
({ \
int err; \
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -129,85 +129,6 @@ static bool xfeature_is_supervisor(int x
}
/*
- * When executing XSAVEOPT (or other optimized XSAVE instructions), if
- * a processor implementation detects that an FPU state component is still
- * (or is again) in its initialized state, it may clear the corresponding
- * bit in the header.xfeatures field, and can skip the writeout of registers
- * to the corresponding memory layout.
- *
- * This means that when the bit is zero, the state component might still contain
- * some previous - non-initialized register state.
- *
- * Before writing xstate information to user-space we sanitize those components,
- * to always ensure that the memory layout of a feature will be in the init state
- * if the corresponding header bit is zero. This is to ensure that user-space doesn't
- * see some stale state in the memory layout during signal handling, debugging etc.
- */
-void fpstate_sanitize_xstate(struct fpu *fpu)
-{
- struct fxregs_state *fx = &fpu->state.fxsave;
- int feature_bit;
- u64 xfeatures;
-
- if (!use_xsaveopt())
- return;
-
- xfeatures = fpu->state.xsave.header.xfeatures;
-
- /*
- * None of the feature bits are in init state. So nothing else
- * to do for us, as the memory layout is up to date.
- */
- if ((xfeatures & xfeatures_mask_all) == xfeatures_mask_all)
- return;
-
- /*
- * FP is in init state
- */
- if (!(xfeatures & XFEATURE_MASK_FP)) {
- fx->cwd = 0x37f;
- fx->swd = 0;
- fx->twd = 0;
- fx->fop = 0;
- fx->rip = 0;
- fx->rdp = 0;
- memset(fx->st_space, 0, sizeof(fx->st_space));
- }
-
- /*
- * SSE is in init state
- */
- if (!(xfeatures & XFEATURE_MASK_SSE))
- memset(fx->xmm_space, 0, sizeof(fx->xmm_space));
-
- /*
- * First two features are FPU and SSE, which above we handled
- * in a special way already:
- */
- feature_bit = 0x2;
- xfeatures = (xfeatures_mask_user() & ~xfeatures) >> 2;
-
- /*
- * Update all the remaining memory layouts according to their
- * standard xstate layout, if their header bit is in the init
- * state:
- */
- while (xfeatures) {
- if (xfeatures & 0x1) {
- int offset = xstate_comp_offsets[feature_bit];
- int size = xstate_sizes[feature_bit];
-
- memcpy((void *)fx + offset,
- (void *)&init_fpstate.xsave + offset,
- size);
- }
-
- xfeatures >>= 1;
- feature_bit++;
- }
-}
-
-/*
* Enable the extended processor state save/restore feature.
* Called once per CPU onlining.
*/
next prev parent reply other threads:[~2021-06-14 16:38 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 15:44 [patch V2 00/52] x86/fpu: Spring cleaning and PKRU sanitizing Thomas Gleixner
2021-06-14 15:44 ` [patch V2 01/52] x86/fpu: Make init_fpstate correct with optimized XSAVE Thomas Gleixner
2021-06-14 19:15 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 02/52] x86/fpu: Fix copy_xstate_to_kernel() gap handling Thomas Gleixner
2021-06-15 11:07 ` Borislav Petkov
2021-06-15 12:47 ` Thomas Gleixner
2021-06-15 12:59 ` Borislav Petkov
2021-06-16 22:02 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 03/52] x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add PKRU value to init_fpstate") Thomas Gleixner
2021-06-15 13:15 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 04/52] x86/fpu: Mark various FPU states __ro_after_init Thomas Gleixner
2021-06-14 15:44 ` [patch V2 05/52] x86/fpu: Remove unused get_xsave_field_ptr() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 06/52] x86/fpu: Move inlines where they belong Thomas Gleixner
2021-06-14 15:44 ` [patch V2 07/52] x86/fpu: Limit xstate copy size in xstateregs_set() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 08/52] x86/fpu: Sanitize xstateregs_set() Thomas Gleixner
2021-06-15 17:40 ` Borislav Petkov
2021-06-15 21:32 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 09/52] x86/fpu: Reject invalid MXCSR values in copy_kernel_to_xstate() Thomas Gleixner
2021-06-16 15:02 ` Borislav Petkov
2021-06-16 23:51 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 10/52] x86/fpu: Simplify PTRACE_GETREGS code Thomas Gleixner
2021-06-14 15:44 ` [patch V2 11/52] x86/fpu: Rewrite xfpregs_set() Thomas Gleixner
2021-06-16 15:22 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 12/52] x86/fpu: Fail ptrace() requests that try to set invalid MXCSR values Thomas Gleixner
2021-06-16 15:31 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 13/52] x86/fpu: Clean up fpregs_set() Thomas Gleixner
2021-06-16 15:42 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 14/52] x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs_get() Thomas Gleixner
2021-06-16 16:13 ` Borislav Petkov
2021-06-17 12:42 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 15/52] x86/fpu: Use copy_uabi_xstate_to_membuf() in xfpregs_get() Thomas Gleixner
2021-06-17 8:59 ` Borislav Petkov
2021-06-18 11:19 ` Borislav Petkov
2021-06-18 13:25 ` [PATCH] selftests/x86/ptrace_syscall: Add a PTRACE_GETFPREGS test Borislav Petkov
2021-06-14 15:44 ` [patch V2 16/52] x86/fpu: Use copy_uabi_xstate_to_membuf() in fpregs_get() Thomas Gleixner
2021-06-17 11:50 ` Borislav Petkov
2021-06-17 12:43 ` Thomas Gleixner
2021-06-14 15:44 ` Thomas Gleixner [this message]
2021-06-14 15:44 ` [patch V2 18/52] x86/fpu: Get rid of using_compacted_format() Thomas Gleixner
2021-06-17 11:59 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 19/52] x86/kvm: Avoid looking up PKRU in XSAVE buffer Thomas Gleixner
2021-06-17 12:09 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 20/52] x86/fpu: Cleanup arch_set_user_pkey_access() Thomas Gleixner
2021-06-17 12:22 ` Borislav Petkov
2021-06-17 12:49 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 21/52] x86/fpu: Get rid of copy_supervisor_to_kernel() Thomas Gleixner
2021-06-17 12:41 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 22/52] x86/fpu: Rename copy_xregs_to_kernel() and copy_kernel_to_xregs() Thomas Gleixner
2021-06-17 12:48 ` Borislav Petkov
2021-06-14 15:44 ` [patch V2 23/52] x86/fpu: Rename copy_user_to_xregs() and copy_xregs_to_user() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 24/52] x86/fpu: Rename fxregs related copy functions Thomas Gleixner
2021-06-14 15:44 ` [patch V2 25/52] x86/fpu: Rename fregs " Thomas Gleixner
2021-06-14 15:44 ` [patch V2 26/52] x86/fpu: Rename xstate copy functions which are related to UABI Thomas Gleixner
2021-06-14 15:44 ` [patch V2 27/52] x86/fpu: Deduplicate copy_uabi_from_user/kernel_to_xstate() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 28/52] x86/fpu: Rename copy_fpregs_to_fpstate() to save_fpregs_to_fpstate() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 29/52] x86/fpu: Rename copy_kernel_to_fpregs() to restore_fpregs_from_kernel() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 30/52] x86/fpu: Rename initstate copy functions Thomas Gleixner
2021-06-14 15:44 ` [patch V2 31/52] x86/fpu: Rename "dynamic" XSTATEs to "independent" Thomas Gleixner
2021-06-14 15:44 ` [patch V2 32/52] x86/fpu/xstate: Sanitize handling of independent features Thomas Gleixner
2021-06-16 20:04 ` Liang, Kan
2021-06-17 7:15 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 33/52] x86/pkeys: Move read_pkru() and write_pkru() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 34/52] x86/fpu: Differentiate "copy" versus "move" of fpregs Thomas Gleixner
2021-06-18 12:21 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 35/52] x86/cpu: Sanitize X86_FEATURE_OSPKE Thomas Gleixner
2021-06-14 15:44 ` [patch V2 36/52] x86/pkru: Provide pkru_get_init_value() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 37/52] x86/pkru: Provide pkru_write_default() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 38/52] x86/cpu: Write the default PKRU value when enabling PKE Thomas Gleixner
2021-06-14 15:44 ` [patch V2 39/52] x86/fpu: Use pkru_write_default() in copy_init_fpstate_to_fpregs() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 40/52] x86/fpu: Rename fpu__clear_all() to fpu_flush_thread() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 41/52] x86/fpu: Clean up the fpu__clear() variants Thomas Gleixner
2021-06-14 15:44 ` [patch V2 42/52] x86/fpu: Rename __fpregs_load_activate() to fpregs_restore_userregs() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 43/52] x86/fpu: Move FXSAVE_LEAK quirk info __copy_kernel_to_fpregs() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 44/52] x86/fpu: Rename xfeatures_mask_user() to xfeatures_mask_uabi() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 45/52] x86/fpu: Dont restore PKRU in fpregs_restore_userspace() Thomas Gleixner
2021-06-16 0:52 ` Yu, Yu-cheng
2021-06-16 8:56 ` Thomas Gleixner
2021-06-14 15:44 ` [patch V2 46/52] x86/fpu: Add PKRU storage outside of task XSAVE buffer Thomas Gleixner
2021-06-14 15:44 ` [patch V2 47/52] x86/fpu: Hook up PKRU into ptrace() Thomas Gleixner
2021-06-14 19:29 ` [patch V2-A " Thomas Gleixner
2021-06-14 15:44 ` [patch V2 48/52] x86/fpu: Mask PKRU from kernel XRSTOR[S] operations Thomas Gleixner
2021-06-14 15:44 ` [patch V2 49/52] x86/fpu: Remove PKRU handling from switch_fpu_finish() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 50/52] x86/fpu: Dont store PKRU in xstate in fpu_reset_fpstate() Thomas Gleixner
2021-06-14 15:44 ` [patch V2 51/52] x86/pkru: Remove xstate fiddling from write_pkru() Thomas Gleixner
2021-06-14 15:45 ` [patch V2 52/52] x86/fpu: Mark init_fpstate __ro_after_init Thomas Gleixner
2021-06-14 20:15 ` [patch] x86/fpu: x86/fpu: Preserve supervisor states in sanitize_restored_user_xstate() Thomas Gleixner
2021-06-16 0:50 ` [patch V2 00/52] x86/fpu: Spring cleaning and PKRU sanitizing Yu, Yu-cheng
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