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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-54194

exfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: exfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree The call stack shown below is a scenario in the Linux 4.19 kernel. Allocating memory failed where exfat fs use kmalloc_array due to system memory fragmentation, while the u-disk was inserted without recognition. Devices such as u-disk using the exfat file system are pluggable and may be insert into the system at any time. However, long-term running systems cannot guarantee the continuity of physical memory. Therefore, it's necessary to address this issue. Binder:2632_6: page allocation failure: order:4, mode:0x6040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null) Call trace: [242178.097582] dump_backtrace+0x0/0x4 [242178.097589] dump_stack+0xf4/0x134 [242178.097598] warn_alloc+0xd8/0x144 [242178.097603] __alloc_pages_nodemask+0x1364/0x1384 [242178.097608] kmalloc_order+0x2c/0x510 [242178.097612] kmalloc_order_trace+0x40/0x16c [242178.097618] __kmalloc+0x360/0x408 [242178.097624] load_alloc_bitmap+0x160/0x284 [242178.097628] exfat_fill_super+0xa3c/0xe7c [242178.097635] mount_bdev+0x2e8/0x3a0 [242178.097638] exfat_fs_mount+0x40/0x50 [242178.097643] mount_fs+0x138/0x2e8 [242178.097649] vfs_kern_mount+0x90/0x270 [242178.097655] do_mount+0x798/0x173c [242178.097659] ksys_mount+0x114/0x1ac [242178.097665] __arm64_sys_mount+0x24/0x34 [242178.097671] el0_svc_common+0xb8/0x1b8 [242178.097676] el0_svc_handler+0x74/0x90 [242178.097681] el0_svc+0x8/0x340 By analyzing the exfat code,we found that continuous physical memory is not required here,so kvmalloc_array is used can solve this problem.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1e49a94cf707204b66a3fb242f2814712c941f52 to < 79d16a84ea41272dfcb0c00f9798ddd0edd8098daffected
  • 1e49a94cf707204b66a3fb242f2814712c941f52 to < 8a34a242cf03211cc89f68308d149b793f63c479affected
  • 1e49a94cf707204b66a3fb242f2814712c941f52 to < 1427a7e96fb90d0896f74f5bcd21feb03cc7c3d0affected
  • 1e49a94cf707204b66a3fb242f2814712c941f52 to < 0c5c3e8a2550b6b2a304b45f260296db9c09df96affected
  • 1e49a94cf707204b66a3fb242f2814712c941f52 to < daf60d6cca26e50d65dac374db92e58de745ad26affected

Linux Linux

Default version status: affected

  • 5.7affected
  • 0 to < 5.7unaffected
  • 5.10.190 to ≤ 5.10.*unaffected
  • 5.15.126 to ≤ 5.15.*unaffected
  • 6.1.45 to ≤ 6.1.*unaffected
  • 6.4.10 to ≤ 6.4.*unaffected
  • 6.5 to ≤ *unaffected

References