CVE-2022-50631

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RISC-V: kexec: Fix memory leak of fdt buffer<br /> <br /> This is reported by kmemleak detector:<br /> <br /> unreferenced object 0xff60000082864000 (size 9588):<br /> comm "kexec", pid 146, jiffies 4294900634 (age 64.788s)<br /> hex dump (first 32 bytes):<br /> d0 0d fe ed 00 00 12 ed 00 00 00 48 00 00 11 40 ...........H...@<br /> 00 00 00 28 00 00 00 11 00 00 00 02 00 00 00 00 ...(............<br /> backtrace:<br /> [] kmemleak_alloc+0x34/0x3e<br /> [] kmalloc_order+0x9c/0xc4<br /> [] kmalloc_order_trace+0x34/0xb6<br /> [] __kmalloc+0x5c2/0x62a<br /> [] kvmalloc_node+0x66/0xd6<br /> [] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea<br /> [] elf_kexec_load+0x206/0x4ec<br /> [] kexec_image_load_default+0x40/0x4c<br /> [] sys_kexec_file_load+0x1c4/0x322<br /> [] ret_from_syscall+0x0/0x2<br /> <br /> In elf_kexec_load(), a buffer is allocated via kvmalloc() to store fdt.<br /> While it&amp;#39;s not freed back to system when kexec kernel is reloaded or<br /> unloaded. Then memory leak is caused. Fix it by introducing riscv<br /> specific function arch_kimage_file_post_load_cleanup(), and freeing the<br /> buffer there.