CVE-2024-26850

In the Linux kernel, the following vulnerability has been resolved:
mm/debug_vm_pgtable: fix BUG_ON with pud advanced test Architectures like
powerpc add debug checks to ensure we find only devmap PUD pte entries.
These debug checks are only done with CONFIG_DEBUG_VM. This patch marks the
ptes used for PUD advanced test devmap pte entries so that we don’t hit on
debug checks on architecture like ppc64 as below. WARNING: CPU: 2 PID: 1 at
arch/powerpc/mm/book3s64/radix_pgtable.c:1382
radix__pud_hugepage_update+0x38/0x138 … NIP [c0000000000a7004]
radix__pud_hugepage_update+0x38/0x138 LR [c0000000000a77a8]
radix__pudp_huge_get_and_clear+0x28/0x60 Call Trace: [c000000004a2f950]
[c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable) [c000000004a2f980]
[000d34c100000000] 0xd34c100000000 [c000000004a2f9a0] [c00000000206ba98]
pud_advanced_tests+0x118/0x334 [c000000004a2fa40] [c00000000206db34]
debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10] [c00000000000fd28]
do_one_initcall+0x60/0x388 Also kernel BUG at
arch/powerpc/mm/book3s64/pgtable.c:202! … NIP [c000000000096510]
pudp_huge_get_and_clear_full+0x98/0x174 LR [c00000000206bb34]
pud_advanced_tests+0x1b4/0x334 Call Trace: [c000000004a2f950]
[000d34c100000000] 0xd34c100000000 (unreliable) [c000000004a2f9a0]
[c00000000206bb34] pud_advanced_tests+0x1b4/0x334 [c000000004a2fa40]
[c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10]
[c00000000000fd28] do_one_initcall+0x60/0x388

Notes