In the Linux kernel, the following vulnerability has been resolved:
powerpc/64s: fix program check interrupt emergency stack path
Emergency stack path was jumping into a 3: label inside the __GEN_COMMON_BODY macro for the normal path after it had finished, rather than jumping over it. By a small miracle this is the correct place to build up a new interrupt frame with the existing stack pointer, so things basically worked okay with an added weird looking 700 trap frame on top (which had the wrong ->nip so it didn't decode bug messages either).
Fix this by avoiding using numeric labels when jumping over non-trivial macros.
Before:
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: sh Not tainted 5.15.0-rc2-00034-ge057cdade6e5 #2637 NIP: 7265677368657265 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3a50 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 00000700 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 c0000000fffb3cf0 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [7265677368657265] 0x7265677368657265 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 Call Trace: [c0000000fffb3cf0] [c00000000000bdac] soft_nmi_common+0x13c/0x1d0 (unreliable) --- interrupt: 700 at decrementer_common_virt+0xb8/0x230 NIP: c0000000000098b8 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 22424282 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 0000000000002400 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [c0000000000098b8] decrementer_common_virt+0xb8/0x230 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 --- interrupt: 700 Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX ---[ end trace 6d28218e0cc3c949 ]---
After:
------------[ cut here ]------------ kernel BUG at arch/powerpc/kernel/exceptions-64s.S:491! Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: login Not tainted 5.15.0-rc2-00034-ge057cdade6e5-dirty #2638 NIP: c0000000000098b8 LR: c00000000006bf04 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 24482227 XER: 00040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006bf04 0000000000002400 c000000001513800 c000000001271868 GPR04: 00000000100f0d29 0000000042000000 0000000000000007 0000000000000009 GPR08: 00000000100f0d29 0000000024482227 0000000000002710 c000000000181b3c GPR12: 9000000000009033 c0000000016b0000 00000000100f0d29 c000000005b22f00 GPR16: 00000000ffff0000 0000000000000001 0000000000000009 00000000100eed90 GPR20: 00000000100eed90 00000 ---truncated---
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Dec 5, 2024 | May 21, 2024 |
| Suse | — | Upgrade ocfs2-kmp-defaultUpgrade dtb-xilinxUpgrade kernel-source-rtUpgrade dtb-sprdUpgrade gfs2-kmp-azureUpgrade kernel-azureUpgrade kernel-default-livepatchUpgrade dlm-kmp-rtUpgrade kernel-debug-vdsoUpgrade kernel-default-vdsoUpgrade kernel-kvmsmall-vdsoUpgrade dtb-marvellUpgrade kernel-docs-htmlUpgrade kernel-develUpgrade ocfs2-kmp-64kbUpgrade kernel-source-vanillaUpgrade kernel-docsUpgrade kernel-debug-develUpgrade dtb-alteraUpgrade reiserfs-kmp-azureUpgrade reiserfs-kmp-rtUpgrade kernel-default-livepatch-develUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-allwinnerUpgrade kselftests-kmp-rtUpgrade cluster-md-kmp-64kbUpgrade dtb-socionextUpgrade kernel-64kb-extraUpgrade kernel-rt-vdsoUpgrade kselftests-kmp-azureUpgrade ocfs2-kmp-azureUpgrade dtb-amdUpgrade dtb-caviumUpgrade kernel-default-baseUpgrade kernel-rt-optionalUpgrade dtb-nvidiaUpgrade kernel-rt-extraUpgrade cluster-md-kmp-rtUpgrade kernel-default-base-rebuildUpgrade dtb-broadcomUpgrade dtb-renesasUpgrade dlm-kmp-defaultUpgrade kernel-obs-buildUpgrade kernel-azure-optionalUpgrade kernel-preempt-develUpgrade gfs2-kmp-defaultUpgrade kernel-default-optionalUpgrade reiserfs-kmp-64kbUpgrade kernel-rt_debug-develUpgrade reiserfs-kmp-defaultUpgrade dtb-rockchipUpgrade kernel-defaultUpgrade kernel-rt-livepatchUpgrade kernel-rt_debug-vdsoUpgrade kernel-kvmsmallUpgrade cluster-md-kmp-defaultUpgrade kernel-default-extraUpgrade kernel-syms-rtUpgrade kernel-syms-azureUpgrade gfs2-kmp-64kbUpgrade dtb-hisiliconUpgrade dtb-freescaleUpgrade dtb-apmUpgrade kernel-preemptUpgrade kernel-sourceUpgrade kernel-64kb-develUpgrade kselftests-kmp-defaultUpgrade dtb-appleUpgrade kernel-default-develUpgrade kernel-rt-livepatch-develUpgrade cluster-md-kmp-azureUpgrade kernel-devel-azureUpgrade kernel-azure-develUpgrade kernel-devel-rtUpgrade kernel-rt-develUpgrade kernel-macrosUpgrade ocfs2-kmp-rtUpgrade kselftests-kmp-64kbUpgrade dtb-amazonUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-obs-qaUpgrade dtb-qcomUpgrade kernel-64kb-optionalUpgrade kernel-kvmsmall-develUpgrade kernel-64kb-livepatch-develUpgrade kernel-source-azureUpgrade kernel-rt_debugUpgrade kernel-rtUpgrade dtb-mediatekUpgrade kernel-zfcpdumpUpgrade gfs2-kmp-rtUpgrade dlm-kmp-azureUpgrade dtb-armUpgrade kernel-debug-livepatch-develUpgrade dtb-amlogicUpgrade kernel-debugUpgrade dtb-lgUpgrade kernel-azure-vdsoUpgrade kernel-symsUpgrade dtb-exynosUpgrade dlm-kmp-64kbUpgrade kernel-azure-extraUpgrade kernel-azure-livepatch-develUpgrade kernel-64kb | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | May 21, 2024 |
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