CVE-2021-47376

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bpf: Add oversize check before call kvcalloc()<br /> <br /> Commit 7661809d493b ("mm: don&amp;#39;t allow oversized kvmalloc() calls") add the<br /> oversize check. When the allocation is larger than what kmalloc() supports,<br /> the following warning triggered:<br /> <br /> WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597<br /> Modules linked in:<br /> CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011<br /> RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597<br /> Call Trace:<br /> kvmalloc include/linux/mm.h:806 [inline]<br /> kvmalloc_array include/linux/mm.h:824 [inline]<br /> kvcalloc include/linux/mm.h:829 [inline]<br /> check_btf_line kernel/bpf/verifier.c:9925 [inline]<br /> check_btf_info kernel/bpf/verifier.c:10049 [inline]<br /> bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759<br /> bpf_prog_load kernel/bpf/syscall.c:2301 [inline]<br /> __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587<br /> __do_sys_bpf kernel/bpf/syscall.c:4691 [inline]<br /> __se_sys_bpf kernel/bpf/syscall.c:4689 [inline]<br /> __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae