CVE-2022-50631: In the Linux kernel, the following vulnerability has been resolved: RISC-V: kexec: Fix memory leak of fdt buffer This is reported by kmemleak detector…

PriorityP421

EPSS

0.19%

9.2th percentile

In the Linux kernel, the following vulnerability has been resolved: RISC-V: kexec: Fix memory leak of fdt buffer This is reported by kmemleak detector: unreferenced object 0xff60000082864000 (size 9588): comm "kexec", pid 146, jiffies 4294900634 (age 64.788s) hex dump (first 32 bytes): d0 0d fe ed 00 00 12 ed 00 00 00 48 00 00 11 40 ...........H...@ 00 00 00 28 00 00 00 11 00 00 00 02 00 00 00 00 ...(............ backtrace: [] kmemleak_alloc+0x34/0x3e [] kmalloc_order+0x9c/0xc4 [] kmalloc_order_trace+0x34/0xb6 [] __kmalloc+0x5c2/0x62a [] kvmalloc_node+0x66/0xd6 [] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea [] elf_kexec_load+0x206/0x4ec [] kexec_image_load_default+0x40/0x4c [] sys_kexec_file_load+0x1c4/0x322 [] ret_from_syscall+0x0/0x2 In elf_kexec_load(), a buffer is allocated via kvmalloc() to store fdt. While it's not freed back to system when kexec kernel is reloaded or unloaded. Then memory leak is caused. Fix it by introducing riscv specific function arch_kimage_file_post_load_cleanup(), and freeing the buffer there.

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= 6261586e0c91db14c34f894f4bc48f2300cff1d4 < c66ad198b6497dee8f45d7ed5c03629c4525c7d0	c66ad198b6497dee8f45d7ed5c03629c4525c7d0
linux	linux	>= 6261586e0c91db14c34f894f4bc48f2300cff1d4 < dc387c34d8dd10b02a333df098f8fd9bba177a45	dc387c34d8dd10b02a333df098f8fd9bba177a45
linux	linux	>= 6261586e0c91db14c34f894f4bc48f2300cff1d4 < 96df59b1ae23f5c11698c3c2159aeb2ecd4944a4	96df59b1ae23f5c11698c3c2159aeb2ecd4944a4
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 5.19.0 < 6.0.18	6.0.18
linux	linux_kernel	>= 6.1.0 < 6.1.4	6.1.4

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