Hello, The following program triggers a WARNING in kmalloc:
// autogenerated by syzkaller (http://github.com/google/syzkaller) #include <syscall.h> #include <string.h> #include <stdint.h> #define SYS_bpf 321 #define BPF_MAP_CREATE 0 #define BPF_MAP_UPDATE_ELEM 2 union bpf_attr { struct { uint32_t map_type; /* one of enum bpf_map_type */ uint32_t key_size; /* size of key in bytes */ uint32_t value_size; /* size of value in bytes */ uint32_t max_entries; /* max number of entries in a map */ }; struct { uint32_t map_fd; uint64_t key; uint64_t val; uint64_t flags; }; }; int main() { union bpf_attr ca; memset(&ca, 0, sizeof(ca)); ca.map_type = 1; ca.key_size = 1; ca.value_size = 0xfffffff9; ca.max_entries = 10; int fd = syscall(SYS_bpf, BPF_MAP_CREATE, &ca, sizeof(ca)); memset(&ca, 0, sizeof(ca)); ca.map_fd = fd; ca.key = &ca; ca.val = &ca; ca.flags = 0; syscall(SYS_bpf, BPF_MAP_UPDATE_ELEM, &ca, sizeof(ca)); return 0; } ------------[ cut here ]------------ WARNING: CPU: 2 PID: 11122 at mm/page_alloc.c:2989 __alloc_pages_nodemask+0x695/0x14e0() Modules linked in: CPU: 2 PID: 11122 Comm: syzkaller_execu Tainted: G B 4.4.0-rc2+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 00000000ffffffff ffff880039aefa30 ffffffff82743b56 0000000000000000 ffff88003b2a0000 ffffffff85a8d0e0 ffff880039aefa70 ffffffff81244ec9 ffffffff81554e95 ffffffff85a8d0e0 0000000000000bad 0000000000000000 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82743b56>] dump_stack+0x68/0x92 lib/dump_stack.c:50 [<ffffffff81244ec9>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:460 [<ffffffff812450f9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:493 [< inline >] __alloc_pages_slowpath mm/page_alloc.c:2989 [<ffffffff81554e95>] __alloc_pages_nodemask+0x695/0x14e0 mm/page_alloc.c:3235 [<ffffffff816188fe>] alloc_pages_current+0xee/0x340 mm/mempolicy.c:2055 [< inline >] alloc_pages include/linux/gfp.h:451 [<ffffffff81550706>] alloc_kmem_pages+0x16/0xf0 mm/page_alloc.c:3414 [<ffffffff815a1c89>] kmalloc_order+0x19/0x60 mm/slab_common.c:1007 [<ffffffff815a1cef>] kmalloc_order_trace+0x1f/0xa0 mm/slab_common.c:1018 [< inline >] kmalloc_large include/linux/slab.h:390 [<ffffffff81627784>] __kmalloc+0x234/0x250 mm/slub.c:3525 [< inline >] kmalloc include/linux/slab.h:463 [< inline >] map_update_elem kernel/bpf/syscall.c:288 [< inline >] SYSC_bpf kernel/bpf/syscall.c:744 [<ffffffff814f07c4>] SyS_bpf+0xfd4/0x1a20 kernel/bpf/syscall.c:695 [<ffffffff8597eeb6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 ---[ end trace f00640b4d448df95 ]--- On commit 78c4a49a69e910a162b05e4e8727b9bdbf948f13 (Now 25). -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
