CVE-2022-50631
Description
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: [<00000000f95b17c4>] kmemleak_alloc+0x34/0x3e [<00000000b9ec8e3e>] kmalloc_order+0x9c/0xc4 [<00000000a95cf02e>] kmalloc_order_trace+0x34/0xb6 [<00000000f01e68b4>] __kmalloc+0x5c2/0x62a [<000000002bd497b2>] kvmalloc_node+0x66/0xd6 [<00000000906542fa>] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea [<00000000e1166bde>] elf_kexec_load+0x206/0x4ec [<0000000036548e09>] kexec_image_load_default+0x40/0x4c [<0000000079fbe1b4>] sys_kexec_file_load+0x1c4/0x322 [<0000000040c62c03>] 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.
How to fix
- Linux Linuxc66ad198b6497dee8f45d7ed5c03629c4525c7d0, dc387c34d8dd10b02a333df098f8fd9bba177a45, 96df59b1ae23f5c11698c3c2159aeb2ecd4944a4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6261586e0c91db14c34f894f4bc48f2300cff1d4 ≤ v < c66ad198b6497dee8f45d7ed5c03629c4525c7d0, 6261586e0c91db14c34f894f4bc48f2300cff1d4 ≤ v < dc387c34d8dd10b02a333df098f8fd9bba177a45, 6261586e0c91db14c34f894f4bc48f2300cff1d4 ≤ v < 96df59b1ae23f5c11698c3c2159aeb2ecd4944a4, 5.19 | c66ad198b6497dee8f45d7ed5c03629c4525c7d0, dc387c34d8dd10b02a333df098f8fd9bba177a45, 96df59b1ae23f5c11698c3c2159aeb2ecd4944a4 |
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