From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ben Hutchings <ben@decadent.org.uk>
Subject: [PATCH 4.9 31/32] x86/entry/64: Use JMP instead of JMPQ
Date: Fri, 9 Aug 2019 15:45:34 +0200 [thread overview]
Message-ID: <20190809133923.929468509@linuxfoundation.org> (raw)
In-Reply-To: <20190809133922.945349906@linuxfoundation.org>
From: Josh Poimboeuf <jpoimboe@redhat.com>
commit 64dbc122b20f75183d8822618c24f85144a5a94d upstream.
Somehow the swapgs mitigation entry code patch ended up with a JMPQ
instruction instead of JMP, where only the short jump is needed. Some
assembler versions apparently fail to optimize JMPQ into a two-byte JMP
when possible, instead always using a 7-byte JMP with relocation. For
some reason that makes the entry code explode with a #GP during boot.
Change it back to "JMP" as originally intended.
Fixes: 18ec54fdd6d1 ("x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/entry/entry_64.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -434,7 +434,7 @@ END(irq_entries_start)
TRACE_IRQS_OFF
CALL_enter_from_user_mode
- jmpq 2f
+ jmp 2f
1:
FENCE_SWAPGS_KERNEL_ENTRY
2:
next prev parent reply other threads:[~2019-08-09 13:47 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 13:45 [PATCH 4.9 00/32] 4.9.189-stable review Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 01/32] scsi: fcoe: Embed fc_rport_priv in fcoe_rport structure Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 02/32] ARM: dts: Add pinmuxing for i2c2 and i2c3 for LogicPD SOM-LV Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 03/32] ARM: dts: Add pinmuxing for i2c2 and i2c3 for LogicPD torpedo Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 04/32] ARM: dts: logicpd-som-lv: Fix Audio Mute Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 05/32] arm64: cpufeature: Fix CTR_EL0 field definitions Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 06/32] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG,ERG} Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 07/32] tcp: be more careful in tcp_fragment() Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 08/32] HID: wacom: fix bit shift for Cintiq Companion 2 Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 09/32] HID: Add quirk for HP X1200 PIXART OEM mouse Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 10/32] RDMA: Directly cast the sockaddr union to sockaddr Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 11/32] [PATCH] IB: directly cast the sockaddr union to aockaddr Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 12/32] objtool: Add machine_real_restart() to the noreturn list Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 13/32] objtool: Add rewind_stack_do_exit() " Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 14/32] libceph: use kbasename() and kill ceph_file_part() Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 15/32] atm: iphase: Fix Spectre v1 vulnerability Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 16/32] net: bridge: delete local fdb on device init failure Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 17/32] net: bridge: mcast: dont delete permanent entries when fast leave is enabled Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 18/32] net: fix ifindex collision during namespace removal Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 19/32] net/mlx5: Use reversed order when unregister devices Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 20/32] net: sched: Fix a possible null-pointer dereference in dequeue_func() Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 21/32] tipc: compat: allow tipc commands without arguments Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 22/32] compat_ioctl: pppoe: fix PPPOEIOCSFWD handling Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 23/32] ip6_tunnel: fix possible use-after-free on xmit Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 24/32] ife: error out when nla attributes are empty Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 25/32] bnx2x: Disable multi-cos feature Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 26/32] block: blk_init_allocated_queue() set q->fq as NULL in the fail case Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 27/32] spi: bcm2835: Fix 3-wire mode if DMA is enabled Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 28/32] x86: cpufeatures: Sort feature word 7 Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 29/32] x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations Greg Kroah-Hartman
2019-08-09 13:45 ` [PATCH 4.9 30/32] x86/speculation: Enable " Greg Kroah-Hartman
2019-08-09 13:45 ` Greg Kroah-Hartman [this message]
2019-08-09 13:45 ` [PATCH 4.9 32/32] x86/speculation/swapgs: Exclude ATOMs from speculation through SWAPGS Greg Kroah-Hartman
2019-08-09 19:59 ` [PATCH 4.9 00/32] 4.9.189-stable review Daniel Díaz
2019-08-10 10:14 ` Greg Kroah-Hartman
2019-08-09 22:07 ` shuah
2019-08-10 7:09 ` Greg Kroah-Hartman
2019-08-10 4:55 ` kernelci.org bot
2019-08-10 15:45 ` Guenter Roeck
2019-08-11 7:37 ` Greg Kroah-Hartman
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