In the Linux kernel, following vulnerability has been resolved: md: Replace snprintf with scnprintf Current code produces a warning as shown below when total characters in constituent block device names plus slashes exceeds 200. snprintf() returns number of characters generated from given input, which could cause expression “200 – len” to wrap around to large positive number. Fix this by using scnprintf() instead, which actual written into buffer. [ 1513.267938] ------------[ cut here ]------------ [ 1513.267943] WARNING: CPU: 15 PID: 37247 at /lib/vsprintf.c:2509 vsnprintf+0x2c8/0x510 [ 1513.267944] Modules linked in: [ 1513.267969] Comm: mdadm Not tainted 5.4.0-1085-azure #90~18.04.1-Ubuntu [ Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 1513.267971] RIP: 0010:vsnprintf+0x2c8/0x510 <-snip-> [ 1513.267982] Call Trace: [ 1513.267986] snprintf+0x45/0x70 [ 1513.267990] ? disk_name+0x71/0xa0 [ 1513.267993] dump_zones+0x114/0x240 [raid0] [ 1513.267996] _cond_resched+0x19/0x40 [ 1513.267998] raid0_run+0x19e/0x270 1513.268000] md_run+0x5e0/0xc50 [ 1513.268003] security_capable+0x3f/0x60 [ 1513.268005] do_md_run+0x19/0x110 [ 1513.268006] md_ioctl+0x195e/0x1f90 [ 1513.268007] blkdev_ioctl+0x91f/0x9f0 [ 1513.268010] block_ioctl+0x3d/0x50 [ 1513.268012] do_vfs_ioctl+0xa9/0x640 [ 1513.268014] __fput+0x162/0x260 [ 1513.268016] ksys_ioctl+0x75/0x80 [ 1513.268017] __x64_sys_ioctl+0x1a/0x20 [ 1513.268019] do_syscall_64+0x5e/0x200 [ 1513.268021] entry_SYSCALL_64_after_hwframe+0x44/0xa9

https://git.kernel.org/stable/c/1727fd5015d8f93474148f94e34cda5aa6ad4a43

https://git.kernel.org/stable/c/3b0a2bd51f60418ecd67493586a2bb2174199de3

https://git.kernel.org/stable/c/41ca95033a0c47cd6dace1f0a36a6eb5ebe799e6

https://git.kernel.org/stable/c/5d8259c9d1915a50c60c7d6e9e7fb9b7da64a175

https://git.kernel.org/stable/c/76694e9ce0b2238c0a5f3ba54f9361dd3770ec78

https://git.kernel.org/stable/c/897b1450abe5a67c842a5d24173ce4449ccdfa94

https://git.kernel.org/stable/c/97238b88583c27c9d3b4a0cedb45f816523f17c3

https://git.kernel.org/stable/c/f95825c4e51cf9a653b0ef947ac78401fc9d3a40