[tip: x86/urgent] x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available

From: tip-bot2 for Thadeu Lima de Souza Cascardo
Date: Fri Jul 29 2022 - 04:12:06 EST


The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: 571c30b1a88465a1c85a6f7762609939b9085a15
Gitweb: https://git.kernel.org/tip/571c30b1a88465a1c85a6f7762609939b9085a15
Author: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
AuthorDate: Thu, 28 Jul 2022 09:26:02 -03:00
Committer: Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 29 Jul 2022 10:02:35 +02:00

x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available

Some cloud hypervisors do not provide IBPB on very recent CPU processors,
including AMD processors affected by Retbleed.

Using IBPB before firmware calls on such systems would cause a GPF at boot
like the one below. Do not enable such calls when IBPB support is not
present.

EFI Variables Facility v0.08 2004-May-17
general protection fault, maybe for address 0x1: 0000 [#1] PREEMPT SMP NOPTI
CPU: 0 PID: 24 Comm: kworker/u2:1 Not tainted 5.19.0-rc8+ #7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
Workqueue: efi_rts_wq efi_call_rts
RIP: 0010:efi_call_rts
Code: e8 37 33 58 ff 41 bf 48 00 00 00 49 89 c0 44 89 f9 48 83 c8 01 4c 89 c2 48 c1 ea 20 66 90 b9 49 00 00 00 b8 01 00 00 00 31 d2 <0f> 30 e8 7b 9f 5d ff e8 f6 f8 ff ff 4c 89 f1 4c 89 ea 4c 89 e6 48
RSP: 0018:ffffb373800d7e38 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000006 RCX: 0000000000000049
RDX: 0000000000000000 RSI: ffff94fbc19d8fe0 RDI: ffff94fbc1b2b300
RBP: ffffb373800d7e70 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000b R11: 000000000000000b R12: ffffb3738001fd78
R13: ffff94fbc2fcfc00 R14: ffffb3738001fd80 R15: 0000000000000048
FS: 0000000000000000(0000) GS:ffff94fc3da00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff94fc30201000 CR3: 000000006f610000 CR4: 00000000000406f0
Call Trace:
<TASK>
? __wake_up
process_one_work
worker_thread
? rescuer_thread
kthread
? kthread_complete_and_exit
ret_from_fork
</TASK>
Modules linked in:

Fixes: 28a99e95f55c ("x86/amd: Use IBPB for firmware calls")
Reported-by: Dimitri John Ledkov <dimitri.ledkov@xxxxxxxxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220728122602.2500509-1-cascardo@xxxxxxxxxxxxx
---
arch/x86/kernel/cpu/bugs.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 6454bc7..6761668 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1520,6 +1520,7 @@ static void __init spectre_v2_select_mitigation(void)
* enable IBRS around firmware calls.
*/
if (boot_cpu_has_bug(X86_BUG_RETBLEED) &&
+ boot_cpu_has(X86_FEATURE_IBPB) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)) {