CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2024-45026 – s390/dasd: fix error recovery leading to data corruption on ESE devices
https://notcve.org/view.php?id=CVE-2024-45026
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: fix error recovery leading to data corruption on ESE devices Extent Space Efficient (ESE) or thin provisioned volumes need to be formatted on demand during usual IO processing. The dasd_ese_needs_format function checks for error codes that signal the non existence of a proper track format. The check for incorrect length is to imprecise since other error cases leading to transport of insufficient data also have this flag set. This might lead to data corruption in certain error cases for example during a storage server warmstart. Fix by removing the check for incorrect length and replacing by explicitly checking for invalid track format in transport mode. Also remove the check for file protected since this is not a valid ESE handling case. • https://git.kernel.org/stable/c/5e2b17e712cf10cc3cc98fde28a88e8f1a1267e9 https://git.kernel.org/stable/c/19f60a55b2fda49bc4f6134a5f6356ef62ee69d8 https://git.kernel.org/stable/c/e245a18281c252c8dbc467492e09bb5d4b012118 https://git.kernel.org/stable/c/a665e3b7ac7d5cdc26e00e3d0fc8fd490e00316a https://git.kernel.org/stable/c/0a228896a1b3654cd461ff654f6a64e97a9c3246 https://git.kernel.org/stable/c/93a7e2856951680cd7fe6ebd705ac10c8a8a5efd https://git.kernel.org/stable/c/5d4a304338daf83ace2887aaacafd66fe99ed5cc https://git.kernel.org/stable/c/7db4042336580dfd75cb5faa82c12cd51 •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-45025 – fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
https://notcve.org/view.php?id=CVE-2024-45025
In the Linux kernel, the following vulnerability has been resolved: fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE copy_fd_bitmaps(new, old, count) is expected to copy the first count/BITS_PER_LONG bits from old->full_fds_bits[] and fill the rest with zeroes. What it does is copying enough words (BITS_TO_LONGS(count/BITS_PER_LONG)), then memsets the rest. That works fine, *if* all bits past the cutoff point are clear. Otherwise we are risking garbage from the last word we'd copied. For most of the callers that is true - expand_fdtable() has count equal to old->max_fds, so there's no open descriptors past count, let alone fully occupied words in ->open_fds[], which is what bits in ->full_fds_bits[] correspond to. The other caller (dup_fd()) passes sane_fdtable_size(old_fdt, max_fds), which is the smallest multiple of BITS_PER_LONG that covers all opened descriptors below max_fds. In the common case (copying on fork()) max_fds is ~0U, so all opened descriptors will be below it and we are fine, by the same reasons why the call in expand_fdtable() is safe. Unfortunately, there is a case where max_fds is less than that and where we might, indeed, end up with junk in ->full_fds_bits[] - close_range(from, to, CLOSE_RANGE_UNSHARE) with * descriptor table being currently shared * 'to' being above the current capacity of descriptor table * 'from' being just under some chunk of opened descriptors. In that case we end up with observably wrong behaviour - e.g. spawn a child with CLONE_FILES, get all descriptors in range 0..127 open, then close_range(64, ~0U, CLOSE_RANGE_UNSHARE) and watch dup(0) ending up with descriptor #128, despite #64 being observably not open. The minimally invasive fix would be to deal with that in dup_fd(). If this proves to add measurable overhead, we can go that way, but let's try to fix copy_fd_bitmaps() first. * new helper: bitmap_copy_and_expand(to, from, bits_to_copy, size). * make copy_fd_bitmaps() take the bitmap size in words, rather than bits; it's 'count' argument is always a multiple of BITS_PER_LONG, so we are not losing any information, and that way we can use the same helper for all three bitmaps - compiler will see that count is a multiple of BITS_PER_LONG for the large ones, so it'll generate plain memcpy()+memset(). Reproducer added to tools/testing/selftests/core/close_range_test.c • https://git.kernel.org/stable/c/ee501f827f3db02d4e599afbbc1a7f8b792d05d7 https://git.kernel.org/stable/c/e807487a1d5fd5d941f26578ae826ca815dbfcd6 https://git.kernel.org/stable/c/fe5bf14881701119aeeda7cf685f3c226c7380df https://git.kernel.org/stable/c/5053581fe5dfb09b58c65dd8462bf5dea71f41ff https://git.kernel.org/stable/c/8cad3b2b3ab81ca55f37405ffd1315bcc2948058 https://git.kernel.org/stable/c/dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a https://git.kernel.org/stable/c/c69d18f0ac7060de724511537810f10f29a27958 https://git.kernel.org/stable/c/9a2fa1472083580b6c66bdaf291f591e1 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-45024 – mm/hugetlb: fix hugetlb vs. core-mm PT locking
https://notcve.org/view.php?id=CVE-2024-45024
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix hugetlb vs. core-mm PT locking We recently made GUP's common page table walking code to also walk hugetlb VMAs without most hugetlb special-casing, preparing for the future of having less hugetlb-specific page table walking code in the codebase. Turns out that we missed one page table locking detail: page table locking for hugetlb folios that are not mapped using a single PMD/PUD. Assume we have hugetlb folio that spans multiple PTEs (e.g., 64 KiB hugetlb folios on arm64 with 4 KiB base page size). GUP, as it walks the page tables, will perform a pte_offset_map_lock() to grab the PTE table lock. However, hugetlb that concurrently modifies these page tables would actually grab the mm->page_table_lock: with USE_SPLIT_PTE_PTLOCKS, the locks would differ. Something similar can happen right now with hugetlb folios that span multiple PMDs when USE_SPLIT_PMD_PTLOCKS. This issue can be reproduced [1], for example triggering: [ 3105.936100] ------------[ cut here ]------------ [ 3105.939323] WARNING: CPU: 31 PID: 2732 at mm/gup.c:142 try_grab_folio+0x11c/0x188 [ 3105.944634] Modules linked in: [...] [ 3105.974841] CPU: 31 PID: 2732 Comm: reproducer Not tainted 6.10.0-64.eln141.aarch64 #1 [ 3105.980406] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-4.fc40 05/24/2024 [ 3105.986185] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 3105.991108] pc : try_grab_folio+0x11c/0x188 [ 3105.994013] lr : follow_page_pte+0xd8/0x430 [ 3105.996986] sp : ffff80008eafb8f0 [ 3105.999346] x29: ffff80008eafb900 x28: ffffffe8d481f380 x27: 00f80001207cff43 [ 3106.004414] x26: 0000000000000001 x25: 0000000000000000 x24: ffff80008eafba48 [ 3106.009520] x23: 0000ffff9372f000 x22: ffff7a54459e2000 x21: ffff7a546c1aa978 [ 3106.014529] x20: ffffffe8d481f3c0 x19: 0000000000610041 x18: 0000000000000001 [ 3106.019506] x17: 0000000000000001 x16: ffffffffffffffff x15: 0000000000000000 [ 3106.024494] x14: ffffb85477fdfe08 x13: 0000ffff9372ffff x12: 0000000000000000 [ 3106.029469] x11: 1fffef4a88a96be1 x10: ffff7a54454b5f0c x9 : ffffb854771b12f0 [ 3106.034324] x8 : 0008000000000000 x7 : ffff7a546c1aa980 x6 : 0008000000000080 [ 3106.038902] x5 : 00000000001207cf x4 : 0000ffff9372f000 x3 : ffffffe8d481f000 [ 3106.043420] x2 : 0000000000610041 x1 : 0000000000000001 x0 : 0000000000000000 [ 3106.047957] Call trace: [ 3106.049522] try_grab_folio+0x11c/0x188 [ 3106.051996] follow_pmd_mask.constprop.0.isra.0+0x150/0x2e0 [ 3106.055527] follow_page_mask+0x1a0/0x2b8 [ 3106.058118] __get_user_pages+0xf0/0x348 [ 3106.060647] faultin_page_range+0xb0/0x360 [ 3106.063651] do_madvise+0x340/0x598 Let's make huge_pte_lockptr() effectively use the same PT locks as any core-mm page table walker would. Add ptep_lockptr() to obtain the PTE page table lock using a pte pointer -- unfortunately we cannot convert pte_lockptr() because virt_to_page() doesn't work with kmap'ed page tables we can have with CONFIG_HIGHPTE. Handle CONFIG_PGTABLE_LEVELS correctly by checking in reverse order, such that when e.g., CONFIG_PGTABLE_LEVELS==2 with PGDIR_SIZE==P4D_SIZE==PUD_SIZE==PMD_SIZE will work as expected. Document why that works. There is one ugly case: powerpc 8xx, whereby we have an 8 MiB hugetlb folio being mapped using two PTE page tables. • https://git.kernel.org/stable/c/9cb28da54643ad464c47585cd5866c30b0218e67 https://git.kernel.org/stable/c/7300dadba49e531af2d890ae4e34c9b115384a62 https://git.kernel.org/stable/c/5f75cfbd6bb02295ddaed48adf667b6c828ce07b •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-45023 – md/raid1: Fix data corruption for degraded array with slow disk
https://notcve.org/view.php?id=CVE-2024-45023
In the Linux kernel, the following vulnerability has been resolved: md/raid1: Fix data corruption for degraded array with slow disk read_balance() will avoid reading from slow disks as much as possible, however, if valid data only lands in slow disks, and a new normal disk is still in recovery, unrecovered data can be read: raid1_read_request read_balance raid1_should_read_first -> return false choose_best_rdev -> normal disk is not recovered, return -1 choose_bb_rdev -> missing the checking of recovery, return the normal disk -> read unrecovered data Root cause is that the checking of recovery is missing in choose_bb_rdev(). Hence add such checking to fix the problem. Also fix similar problem in choose_slow_rdev(). • https://git.kernel.org/stable/c/9f3ced792203891b8fa39afa37908eba843fcfac https://git.kernel.org/stable/c/2febf5fdbf5d9a52ddc3e986971c8609b1582d67 https://git.kernel.org/stable/c/c916ca35308d3187c9928664f9be249b22a3a701 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-45022 – mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0
https://notcve.org/view.php?id=CVE-2024-45022
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. • https://git.kernel.org/stable/c/fe5c2bdcb14c8612eb5e7a09159801c7219e9ac4 https://git.kernel.org/stable/c/e9c3cda4d86e56bf7fe403729f38c4f0f65d3860 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 •