CVE-2024-26850

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mm/debug_vm_pgtable: fix BUG_ON with pud advanced test<br /> <br /> Architectures like powerpc add debug checks to ensure we find only devmap<br /> PUD pte entries. These debug checks are only done with CONFIG_DEBUG_VM. <br /> This patch marks the ptes used for PUD advanced test devmap pte entries so<br /> that we don&amp;#39;t hit on debug checks on architecture like ppc64 as below.<br /> <br /> WARNING: CPU: 2 PID: 1 at arch/powerpc/mm/book3s64/radix_pgtable.c:1382 radix__pud_hugepage_update+0x38/0x138<br /> ....<br /> NIP [c0000000000a7004] radix__pud_hugepage_update+0x38/0x138<br /> LR [c0000000000a77a8] radix__pudp_huge_get_and_clear+0x28/0x60<br /> Call Trace:<br /> [c000000004a2f950] [c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable)<br /> [c000000004a2f980] [000d34c100000000] 0xd34c100000000<br /> [c000000004a2f9a0] [c00000000206ba98] pud_advanced_tests+0x118/0x334<br /> [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48<br /> [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388<br /> <br /> Also<br /> <br /> kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:202!<br /> ....<br /> <br /> NIP [c000000000096510] pudp_huge_get_and_clear_full+0x98/0x174<br /> LR [c00000000206bb34] pud_advanced_tests+0x1b4/0x334<br /> Call Trace:<br /> [c000000004a2f950] [000d34c100000000] 0xd34c100000000 (unreliable)<br /> [c000000004a2f9a0] [c00000000206bb34] pud_advanced_tests+0x1b4/0x334<br /> [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48<br /> [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388