Josh Poimboeuf 931b6bfe8a x86/entry/64: Use JMP instead of JMPQ ...

commit 64dbc122b2 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: 18ec54fdd6 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-08-06 19:06:58 +02:00

..

syscalls

x86: Wire up restartable sequence system call

2018-06-06 11:58:32 +02:00

vdso

x86/vdso: Prevent segfaults due to hoisted vclock reads

2019-08-06 19:06:57 +02:00

vsyscall

docs: Fix some broken references

2018-06-15 18:10:01 -03:00

calling.h

x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations

2019-08-06 19:06:58 +02:00

common.c

x86/speculation/mds: Clear CPU buffers on exit to user

2019-05-14 19:17:55 +02:00

entry_32.S

x86/entry/32: Fix ENDPROC of common_spurious

2019-07-21 09:03:18 +02:00

entry_64_compat.S

x86/entry/64/compat: Fix stack switching for XEN PV

2019-01-31 08:14:39 +01:00

entry_64.S

x86/entry/64: Use JMP instead of JMPQ

2019-08-06 19:06:58 +02:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

syscall_32.c

syscalls/x86: Unconditionally enable 'struct pt_regs' based syscalls on x86_64

2018-04-05 16:59:38 +02:00

syscall_64.c

syscalls/x86: Unconditionally enable 'struct pt_regs' based syscalls on x86_64

2018-04-05 16:59:38 +02:00

thunk_32.S

x86: move exports to actual definitions

2016-08-07 23:47:15 -04:00

thunk_64.S

x86: move exports to actual definitions

2016-08-07 23:47:15 -04:00