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Josh Poimboeuf bb4b487bbd x86/bugs: Don't fill RSB on context switch with eIBRS 
[ Upstream commit 27ce8299bc ]

User->user Spectre v2 attacks (including RSB) across context switches
are already mitigated by IBPB in cond_mitigation(), if enabled globally
or if either the prev or the next task has opted in to protection.  RSB
filling without IBPB serves no purpose for protecting user space, as
indirect branches are still vulnerable.

User->kernel RSB attacks are mitigated by eIBRS.  In which case the RSB
filling on context switch isn't needed, so remove it.

Suggested-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Reviewed-by: Amit Shah <amit.shah@amd.com>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/98cdefe42180358efebf78e3b80752850c7a3e1b.1744148254.git.jpoimboe@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-02 07:59:24 +02:00
..
pat x86/mm: Clear _PAGE_DIRTY for kernel mappings when we clear _PAGE_RW 2025-04-20 10:15:11 +02:00
amdtopology.c mm: introduce numa_memblks 2024-09-03 21:15:30 -07:00
cpu_entry_area.c x86/cpu_entry_area: Annotate percpu_setup_exception_stacks() as __init 2024-08-25 14:29:38 +02:00
debug_pagetables.c x86/bugs: Rename CONFIG_PAGE_TABLE_ISOLATION => CONFIG_MITIGATION_PAGE_TABLE_ISOLATION 2024-01-10 10:52:28 +01:00
dump_pagetables.c - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
extable.c x86/extable: Remove unused fixup type EX_TYPE_COPY 2024-04-04 17:01:40 +02:00
fault.c x86/mm: Convert unreachable() to BUG() 2025-02-17 10:05:47 +01:00
highmem_32.c x86/mm: Include asm/numa.h for set_highmem_pages_init() 2023-05-18 11:56:18 -07:00
hugetlbpage.c treewide: use initializer for struct vm_unmapped_area_info 2024-04-25 20:56:27 -07:00
ident_map.c x86/mm: Add _PAGE_NOPTISHADOW bit to avoid updating userspace page tables 2024-12-14 20:03:33 +01:00
init.c x86/mm: Don't disable PCID when INVLPG has been fixed by microcode 2025-03-13 13:02:20 +01:00
init_32.c mm/treewide: replace pmd_large() with pmd_leaf() 2024-03-06 13:04:19 -08:00
init_64.c x86/kaslr: Expose and use the end of the physical memory address space 2024-08-20 13:44:57 +02:00
iomap_32.c io-mapping: Cleanup atomic iomap 2020-11-06 23:14:58 +01:00
ioremap.c x86/mm: Fix a kdump kernel failure on SME system when CONFIG_IMA_KEXEC=y 2024-11-13 14:11:33 +01:00
kasan_init_64.c mm/treewide: replace pud_large() with pud_leaf() 2024-03-06 13:04:19 -08:00
kaslr.c x86/kaslr: Expose and use the end of the physical memory address space 2024-08-20 13:44:57 +02:00
kmmio.c x86/mm/kmmio: Remove redundant preempt_disable() 2022-12-12 10:54:48 -05:00
kmsan_shadow.c x86: kmsan: handle CPU entry area 2022-10-03 14:03:26 -07:00
maccess.c x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() 2024-02-15 19:21:39 -08:00
Makefile mm: introduce numa_emulation 2024-09-03 21:15:31 -07:00
mem_encrypt.c x86/sev: Add callback to apply RMP table fixups for kexec 2024-04-29 11:21:09 +02:00
mem_encrypt_amd.c - Add support for running the kernel in a SEV-SNP guest, over a Secure 2024-07-16 11:12:25 -07:00
mem_encrypt_boot.S x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros 2022-12-15 10:37:27 -08:00
mem_encrypt_identity.c x86/sev: Add missing RIP_REL_REF() invocations during sme_enable() 2025-04-10 14:39:11 +02:00
mm_internal.h x86/mm: thread pgprot_t through init_memory_mapping() 2020-04-10 15:36:21 -07:00
mmap.c mm: switch mm->get_unmapped_area() to a flag 2024-04-25 20:56:25 -07:00
mmio-mod.c x86: Replace cpumask_weight() with cpumask_empty() where appropriate 2022-04-10 22:35:38 +02:00
numa.c mm: make range-to-target_node lookup facility a part of numa_memblks 2024-09-03 21:15:32 -07:00
numa_32.c fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
numa_64.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
numa_internal.h mm: introduce numa_emulation 2024-09-03 21:15:31 -07:00
pf_in.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pf_in.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pgprot.c x86/mm: move protection_map[] inside the platform 2022-07-17 17:14:38 -07:00
pgtable.c mm/x86: add missing pud helpers 2024-09-01 20:26:09 -07:00
pgtable_32.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
physaddr.c mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions 2019-12-10 10:12:55 +01:00
physaddr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pkeys.c x86/pkeys: Clarify PKRU_AD_KEY macro 2022-06-07 16:06:33 -07:00
pti.c x86/mm: Add _PAGE_NOPTISHADOW bit to avoid updating userspace page tables 2024-12-14 20:03:33 +01:00
srat.c x86/mm: Don't print out SRAT table information 2024-08-08 17:23:40 +02:00
testmmiotrace.c x86/mm: add testmmiotrace MODULE_DESCRIPTION() 2024-09-01 20:43:31 -07:00
tlb.c x86/bugs: Don't fill RSB on context switch with eIBRS 2025-05-02 07:59:24 +02:00