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Message-ID: <2024091109-CVE-2024-45022-08f3@gregkh> Date: Wed, 11 Sep 2024 17:14:18 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-45022: mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0 Description =========== In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0 The __vmap_pages_range_noflush() assumes its argument pages** contains pages with the same page shift. However, since commit e9c3cda4d86e ("mm, vmalloc: fix high order __GFP_NOFAIL allocations"), if gfp_flags includes __GFP_NOFAIL with high order in vm_area_alloc_pages() and page allocation failed for high order, the pages** may contain two different page shifts (high order and order-0). This could lead __vmap_pages_range_noflush() to perform incorrect mappings, potentially resulting in memory corruption. Users might encounter this as follows (vmap_allow_huge = true, 2M is for PMD_SIZE): kvmalloc(2M, __GFP_NOFAIL|GFP_X) __vmalloc_node_range_noprof(vm_flags=VM_ALLOW_HUGE_VMAP) vm_area_alloc_pages(order=9) ---> order-9 allocation failed and fallback to order-0 vmap_pages_range() vmap_pages_range_noflush() __vmap_pages_range_noflush(page_shift = 21) ----> wrong mapping happens We can remove the fallback code because if a high-order allocation fails, __vmalloc_node_range_noprof() will retry with order-0. Therefore, it is unnecessary to fallback to order-0 here. Therefore, fix this by removing the fallback code. The Linux kernel CVE team has assigned CVE-2024-45022 to this issue. Affected and fixed versions =========================== Issue introduced in 6.1.95 with commit fe5c2bdcb14c and fixed in 6.1.107 with commit fd1ffbb50ef4 Issue introduced in 6.3 with commit e9c3cda4d86e and fixed in 6.6.48 with commit de7bad86345c Issue introduced in 6.3 with commit e9c3cda4d86e and fixed in 6.10.7 with commit c91618816f4d Issue introduced in 6.3 with commit e9c3cda4d86e and fixed in 6.11-rc4 with commit 61ebe5a747da Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-45022 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: mm/vmalloc.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/fd1ffbb50ef4da5e1378a46616b6d7407dc795da https://git.kernel.org/stable/c/de7bad86345c43cd040ed43e20d9fad78a3ee59f https://git.kernel.org/stable/c/c91618816f4d21fc574d7577a37722adcd4075b2 https://git.kernel.org/stable/c/61ebe5a747da649057c37be1c37eb934b4af79ca
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