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From: Ben Hutchings <ben@decadent.org.uk>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: akpm@linux-foundation.org, "Ingo Molnar" <mingo@kernel.org>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Borislav Petkov" <bp@alien8.de>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Fenghua Yu" <fenghua.yu@intel.com>,
	"Oleg Nesterov" <oleg@redhat.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Dave Hansen" <dave.hansen@linux.intel.com>
Subject: [PATCH 3.16 01/63] x86/fpu: Fix the 'nofxsr' boot parameter to also clear X86_FEATURE_FXSR_OPT
Date: Sat, 22 Sep 2018 01:15:42 +0100	[thread overview]
Message-ID: <lsq.1537575342.627989017@decadent.org.uk> (raw)
In-Reply-To: <lsq.1537575341.194909669@decadent.org.uk>

3.16.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ingo Molnar <mingo@kernel.org>

commit d364a7656c1855c940dfa4baf4ebcc3c6a9e6fd2 upstream.

I tried to simulate an ancient CPU via this option, and
found that it still has fxsr_opt enabled, confusing the
FPU code.

Make the 'nofxsr' option also clear FXSR_OPT flag.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 arch/x86/kernel/cpu/common.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -199,6 +199,15 @@ static int __init x86_noinvpcid_setup(ch
 }
 early_param("noinvpcid", x86_noinvpcid_setup);
 
+static int __init x86_fxsr_setup(char *s)
+{
+	setup_clear_cpu_cap(X86_FEATURE_FXSR);
+	setup_clear_cpu_cap(X86_FEATURE_FXSR_OPT);
+	setup_clear_cpu_cap(X86_FEATURE_XMM);
+	return 1;
+}
+__setup("nofxsr", x86_fxsr_setup);
+
 #ifdef CONFIG_X86_32
 static int cachesize_override = -1;
 static int disable_x86_serial_nr = 1;
@@ -210,14 +219,6 @@ static int __init cachesize_setup(char *
 }
 __setup("cachesize=", cachesize_setup);
 
-static int __init x86_fxsr_setup(char *s)
-{
-	setup_clear_cpu_cap(X86_FEATURE_FXSR);
-	setup_clear_cpu_cap(X86_FEATURE_XMM);
-	return 1;
-}
-__setup("nofxsr", x86_fxsr_setup);
-
 static int __init x86_sep_setup(char *s)
 {
 	setup_clear_cpu_cap(X86_FEATURE_SEP);


  parent reply	other threads:[~2018-09-22  0:24 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-22  0:15 [PATCH 3.16 00/63] 3.16.58-rc1 review Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 51/63] xfs: catch inode allocation state mismatch corruption Ben Hutchings
2018-09-22  5:25   ` Dave Chinner
2018-09-22 20:57     ` Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 07/63] usbip: usbip_host: refine probe and disconnect debug msgs to be useful Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 41/63] USB: yurex: fix out-of-bounds uaccess in read handler Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 54/63] seccomp: create internal mode-setting function Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 45/63] x86/paravirt: Fix spectre-v2 mitigations for paravirt guests Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 36/63] jbd2: don't mark block as modified if the handle is out of credits Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 18/63] sr: pass down correctly sized SCSI sense buffer Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 06/63] usbip: usbip_host: fix to hold parent lock for device_attach() calls Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 29/63] ext4: make sure bitmaps and the inode table don't overlap with bg descriptors Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 63/63] mm: get rid of vmacache_flush_all() entirely Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 26/63] ext4: verify the depth of extent tree in ext4_find_extent() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 38/63] Fix up non-directory creation in SGID directories Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 56/63] seccomp: split mode setting routines Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 13/63] futex: Remove unnecessary warning from get_futex_key Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 21/63] Bluetooth: hidp: buffer overflow in hidp_process_report Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 32/63] ext4: always verify the magic number in xattr blocks Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 23/63] xfs: set format back to extents if xfs_bmap_extents_to_btree Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 08/63] usbip: usbip_host: delete device from busid_table after rebind Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 60/63] x86/cpu/AMD: Fix erratum 1076 (CPB bit) Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 57/63] seccomp: add "seccomp" syscall Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 20/63] scsi: sg: allocate with __GFP_ZERO in sg_build_indirect() Ben Hutchings
2018-09-22  0:19   ` syzbot
2018-09-22  0:15 ` [PATCH 3.16 04/63] net: Set sk_prot_creator when cloning sockets to the right proto Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 33/63] ext4: never move the system.data xattr out of the inode body Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 55/63] seccomp: extract check/assign mode helpers Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 16/63] KVM: x86: pass kvm_vcpu to kvm_read_guest_virt and kvm_write_guest_virt_system Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 35/63] ext4: add more inode number paranoia checks Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 42/63] ALSA: rawmidi: Change resized buffers atomically Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 27/63] ext4: always check block group bounds in ext4_init_block_bitmap() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 25/63] ext4: fix check to prevent initializing reserved inodes Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 14/63] KVM: x86: Emulator ignores LDTR/TR extended base on LLDT/LTR Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 15/63] KVM: x86: introduce linear_{read,write}_system Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 61/63] x86/cpu/intel: Add Knights Mill to Intel family Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 40/63] infiniband: fix a possible use-after-free bug Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 09/63] usbip: usbip_host: run rebind from exit when module is removed Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 11/63] usbip: usbip_host: fix bad unlock balance during stub_probe() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 12/63] futex: Remove requirement for lock_page() in get_futex_key() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 30/63] ext4: fix false negatives *and* false positives in ext4_check_descriptors() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 37/63] ext4: avoid running out of journal credits when appending to an inline file Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 47/63] uas: replace WARN_ON_ONCE() with lockdep_assert_held() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 44/63] x86/speculation: Protect against userspace-userspace spectreRSB Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 49/63] btrfs: relocation: Only remove reloc rb_trees if reloc control has been initialized Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 24/63] ext4: only look at the bg_flags field if it is valid Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 53/63] xfs: don't call xfs_da_shrink_inode with NULL bp Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 17/63] kvm: x86: use correct privilege level for sgdt/sidt/fxsave/fxrstor access Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 43/63] x86/speculation: Clean up various Spectre related details Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 52/63] xfs: validate cached inodes are free when allocated Ben Hutchings
2018-09-22  5:26   ` Dave Chinner
2018-09-22 20:57     ` Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 48/63] video: uvesafb: Fix integer overflow in allocation Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 19/63] jfs: Fix inconsistency between memory allocation and ea_buf->max_size Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 22/63] scsi: libsas: defer ata device eh commands to libata Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 05/63] usbip: fix error handling in stub_probe() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 10/63] usbip: usbip_host: fix NULL-ptr deref and use-after-free errors Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 46/63] cdrom: Fix info leak/OOB read in cdrom_ioctl_drive_status Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 28/63] ext4: don't allow r/w mounts if metadata blocks overlap the superblock Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 03/63] Revert "vti4: Don't override MTU passed on link creation via IFLA_MTU" Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 34/63] ext4: clear i_data in ext4_inode_info when removing inline data Ben Hutchings
2018-09-22  0:15 ` Ben Hutchings [this message]
2018-09-22  0:15 ` [PATCH 3.16 02/63] x86/fpu: Default eagerfpu if FPU and FXSR are enabled Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 58/63] x86/process: Optimize TIF checks in __switch_to_xtra() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 31/63] ext4: add corruption check in ext4_xattr_set_entry() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 39/63] x86/entry/64: Remove %ebx handling from error_entry/exit Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 59/63] x86/process: Correct and optimize TIF_BLOCKSTEP switch Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 50/63] hfsplus: fix NULL dereference in hfsplus_lookup() Ben Hutchings
2018-09-22  0:15 ` [PATCH 3.16 62/63] KVM: x86: introduce num_emulated_msrs Ben Hutchings
2018-09-22 12:28 ` [PATCH 3.16 00/63] 3.16.58-rc1 review Guenter Roeck
2018-09-22 21:03   ` Ben Hutchings

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