iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
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?
Affected products
12- osv-coords10 versionspkg:deb/ubuntu/linux@6.11.0-18.18?arch=source&distro=oracularpkg:deb/ubuntu/linux-aws@6.11.0-1009.10?arch=source&distro=oracularpkg:deb/ubuntu/linux-azure@6.11.0-1009.9?arch=source&distro=oracularpkg:deb/ubuntu/linux-gcp@6.11.0-1009.9?arch=source&distro=oracularpkg:deb/ubuntu/linux-lowlatency@6.11.0-1010.11?arch=source&distro=oracularpkg:deb/ubuntu/linux-oracle@6.11.0-1011.12?arch=source&distro=oracularpkg:deb/ubuntu/linux-raspi@6.11.0-1008.8?arch=source&distro=oracularpkg:deb/ubuntu/linux-realtime@6.11.0-1005.5?arch=source&distro=oracularpkg:rpm/opensuse/kernel-source&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/kernel-source-longterm&distro=openSUSE%20Tumbleweed
< 6.11.0-18.18+ 9 more
- (no CPE)range: < 6.11.0-18.18
- (no CPE)range: < 6.11.0-1009.10
- (no CPE)range: < 6.11.0-1009.9
- (no CPE)range: < 6.11.0-1009.9
- (no CPE)range: < 6.11.0-1010.11
- (no CPE)range: < 6.11.0-1011.12
- (no CPE)range: < 6.11.0-1008.8
- (no CPE)range: < 6.11.0-1005.5
- (no CPE)range: < 6.11.8-1.1
- (no CPE)range: < 6.12.11-1.1
Patches
Vulnerability mechanics
References
3News mentions
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