CVE-2021-47376

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Agregar verificación de tamaño excesivo antes de llamar a kvcalloc() Confirmación 7661809d493b ("mm: no permitir llamadas a kvmalloc() de gran tamaño") agregar la verificación de tamaño excesivo. Cuando la asignación es mayor que lo que admite kmalloc(), se activa la siguiente advertencia: ADVERTENCIA: CPU: 0 PID: 8408 en mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Módulos vinculados en: CPU : 0 PID: 8408 Comm: syz-executor221 No contaminado 5.14.0-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util .c:597 Seguimiento de llamadas: kvmalloc include/linux/mm.h:806 [en línea] kvmalloc_array include/linux/mm.h:824 [en línea] kvcalloc include/linux/mm.h:829 [en línea] check_btf_line kernel/bpf /verifier.c:9925 [en línea] check_btf_info kernel/bpf/verifier.c:10049 [en línea] bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759 bpf_prog_load kernel/bpf/syscall.c:2301 [en línea] __sys_bpf +0x11181/0x126e0 kernel/bpf/syscall.c:4587 __do_sys_bpf kernel/bpf/syscall.c:4691 [en línea] __se_sys_bpf kernel/bpf/syscall.c:4689 [en línea] __x64_sys_bpf+0x78/0x90 pf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [en línea] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x44/0xae

In the Linux kernel, the following vulnerability has been resolved: bpf: Add oversize check before call kvcalloc() Commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") add the oversize check. When the allocation is larger than what kmalloc() supports, the following warning triggered: WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Modules linked in: CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597 Call Trace: kvmalloc include/linux/mm.h:806 [inline] kvmalloc_array include/linux/mm.h:824 [inline] kvcalloc include/linux/mm.h:829 [inline] check_btf_line kernel/bpf/verifier.c:9925 [inline] check_btf_info kernel/bpf/verifier.c:10049 [inline] bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759 bpf_prog_load kernel/bpf/syscall.c:2301 [inline] __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae