In the Linux kernel, the following vulnerability has been resolved: jfs: Fix uninit-value access of imap allocated in the diMount() function syzbot reports that hexdumptobuffer is using uninit-value: ===================================================== BUG: KMSAN: uninit-value in hexdumptobuffer+0x888/0x1100 lib/hexdump.c:171 hexdumptobuffer+0x888/0x1100 lib/hexdump.c:171 printhexdump+0x13d/0x3e0 lib/hexdump.c:276 diFree+0x5ba/0x4350 fs/jfs/jfsimap.c:876 jfsevictinode+0x510/0x550 fs/jfs/inode.c:156 evict+0x723/0xd10 fs/inode.c:796 iputfinal fs/inode.c:1946 [inline] iput+0x97b/0xdb0 fs/inode.c:1972 txUpdateMap+0xf3e/0x1150 fs/jfs/jfstxnmgr.c:2367 txLazyCommit fs/jfs/jfstxnmgr.c:2664 [inline] jfslazycommit+0x627/0x11d0 fs/jfs/jfstxnmgr.c:2733 kthread+0x6b9/0xef0 kernel/kthread.c:464 retfromfork+0x6d/0x90 arch/x86/kernel/process.c:148 retfromforkasm+0x1a/0x30 arch/x86/entry/entry64.S:244 Uninit was created at: slabpostallochook mm/slub.c:4121 [inline] slaballocnode mm/slub.c:4164 [inline] _kmalloccachenoprof+0x8e3/0xdf0 mm/slub.c:4320 kmallocnoprof include/linux/slab.h:901 [inline] diMount+0x61/0x7f0 fs/jfs/jfsimap.c:105 jfsmount+0xa8e/0x11d0 fs/jfs/jfsmount.c:176 jfsfillsuper+0xa47/0x17c0 fs/jfs/super.c:523 gettreebdevflags+0x6ec/0x910 fs/super.c:1636 gettreebdev+0x37/0x50 fs/super.c:1659 jfsgettree+0x34/0x40 fs/jfs/super.c:635 vfsgettree+0xb1/0x5a0 fs/super.c:1814 donewmount+0x71f/0x15e0 fs/namespace.c:3560 pathmount+0x742/0x1f10 fs/namespace.c:3887 domount fs/namespace.c:3900 [inline] _dosysmount fs/namespace.c:4111 [inline] _sesysmount+0x71f/0x800 fs/namespace.c:4088 _x64sysmount+0xe4/0x150 fs/namespace.c:4088 x64syscall+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls64.h:166 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xcd/0x1e0 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f ===================================================== The reason is that imap is not properly initialized after memory allocation. It will cause the snprintf() function to write uninitialized data into linebuf within hexdumpto_buffer(). Fix this by using kzalloc instead of kmalloc to clear its content at the beginning in diMount().
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-buildinfo-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-headers-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-image-unsigned-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-image-unsigned-6.14.0-1005-oem-dbgsym", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-ipu6-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-ipu7-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-iwlwifi-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-usbio-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-modules-vision-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-oem-6.14-headers-6.14.0-1005", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-oem-6.14-tools-6.14.0-1005", "binary_version": "6.14.0-1005.5" }, { "binary_name": "linux-tools-6.14.0-1005-oem", "binary_version": "6.14.0-1005.5" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "bpftool", "binary_version": "7.6.0+6.14.0-22.22" }, { "binary_name": "linux-bpf-dev", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-buildinfo-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-buildinfo-6.14.0-22-generic-64k", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-cloud-tools-6.14.0-22", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-cloud-tools-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-cloud-tools-common", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-doc", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-headers-6.14.0-22", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-headers-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-headers-6.14.0-22-generic-64k", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-6.14.0-22-generic-dbgsym", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-unsigned-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-unsigned-6.14.0-22-generic-64k", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-unsigned-6.14.0-22-generic-64k-dbgsym", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-image-unsigned-6.14.0-22-generic-dbgsym", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-lib-rust-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-libc-dev", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-6.14.0-22-generic-64k", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-extra-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-ipu6-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-ipu7-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-iwlwifi-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-usbio-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-modules-vision-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-perf", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-source-6.14.0", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-tools-6.14.0-22", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-tools-6.14.0-22-generic", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-tools-6.14.0-22-generic-64k", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-tools-common", "binary_version": "6.14.0-22.22" }, { "binary_name": "linux-tools-host", "binary_version": "6.14.0-22.22" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-azure-cloud-tools-6.14.0-1007", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-azure-headers-6.14.0-1007", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-azure-tools-6.14.0-1007", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-buildinfo-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-cloud-tools-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-headers-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-image-unsigned-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-image-unsigned-6.14.0-1007-azure-dbgsym", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-modules-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-modules-extra-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-tools-6.14.0-1007-azure", "binary_version": "6.14.0-1007.7" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-buildinfo-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-buildinfo-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-gcp-headers-6.14.0-1008", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-gcp-tools-6.14.0-1008", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-headers-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-headers-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-image-unsigned-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-image-unsigned-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-image-unsigned-6.14.0-1008-gcp-64k-dbgsym", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-image-unsigned-6.14.0-1008-gcp-dbgsym", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-modules-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-modules-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-modules-extra-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-modules-extra-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-tools-6.14.0-1008-gcp", "binary_version": "6.14.0-1008.8" }, { "binary_name": "linux-tools-6.14.0-1008-gcp-64k", "binary_version": "6.14.0-1008.8" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-buildinfo-6.14.0-1007-raspi", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-headers-6.14.0-1007-raspi", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-image-6.14.0-1007-raspi", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-image-6.14.0-1007-raspi-dbgsym", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-modules-6.14.0-1007-raspi", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-raspi-headers-6.14.0-1007", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-raspi-tools-6.14.0-1007", "binary_version": "6.14.0-1007.7" }, { "binary_name": "linux-tools-6.14.0-1007-raspi", "binary_version": "6.14.0-1007.7" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-buildinfo-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-cloud-tools-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-headers-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-image-unsigned-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-image-unsigned-6.14.0-1004-realtime-dbgsym", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-modules-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-modules-extra-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-modules-iwlwifi-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-realtime-cloud-tools-6.14.0-1004", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-realtime-headers-6.14.0-1004", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-realtime-tools-6.14.0-1004", "binary_version": "6.14.0-1004.4" }, { "binary_name": "linux-tools-6.14.0-1004-realtime", "binary_version": "6.14.0-1004.4" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "linux-buildinfo-6.14.0-22-generic", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-headers-6.14.0-22-generic", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-image-6.14.0-22-generic", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-image-6.14.0-22-generic-dbgsym", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-modules-6.14.0-22-generic", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-riscv-headers-6.14.0-22", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-riscv-tools-6.14.0-22", "binary_version": "6.14.0-22.22.1" }, { "binary_name": "linux-tools-6.14.0-22-generic", "binary_version": "6.14.0-22.22.1" } ] }