Riskcovery

CVE-2024-50222

iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP

State
Published
Severity
7.0 High
Published
Nov 9, 2024
Updated
Aug 5, 2026
Reserved
Oct 21, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP

generic/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem, on huge=always tmpfs, issues a warning and then hangs (interruptibly):

WARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9 CPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2 ... copy_page_from_iter_atomic+0xa6/0x5ec generic_perform_write+0xf6/0x1b4 shmem_file_write_iter+0x54/0x67

Fix copy_page_from_iter_atomic() by limiting it in that case (include/linux/skbuff.h skb_frag_must_loop() does similar).

But going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too surprising, has outlived its usefulness, and should just be removed?

Scores

CVSSScoreVectorSource
3.17.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 908a1ad89466c1febf20bfe0037b84fc66f8a3f8 to before 4f7ffa83fa79dd52efbaef366c850aaaae06a469Affected
  • 908a1ad89466c1febf20bfe0037b84fc66f8a3f8 to before 3a303409f271dfe0987b8f79595138340497a32dAffected
  • 908a1ad89466c1febf20bfe0037b84fc66f8a3f8 to before c749d9b7ebbc5716af7a95f7768634b30d9446ecAffected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.60 through 6.6.*Not affected
  • 6.11.7 through 6.11.*Not affected
  • 6.12 and laterNot affected

References

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