On (11/07/17 19:45), Sergey Senozhatsky wrote: [..] > > [ 22.257125] BUG: KASAN: slab-out-of-bounds in copyin+0xea/0x170 > > [ 22.258648] Write of size 26 at addr ffff880013432540 by task init/1 > > [ 22.260272] > > [ 22.260860] CPU: 0 PID: 1 Comm: init Not tainted 4.14.0-rc8 #14 > > [ 22.262379] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > > 1.10.2-1 04/01/2014 > > [ 22.264441] Call Trace: > > [ 22.265206] dump_stack+0x5d/0x81 > > [ 22.266147] print_address_description+0xa7/0x280 > > [ 22.267369] ? copyin+0xea/0x170 > > [ 22.268282] ? copyin+0xea/0x170 > > [ 22.268990] kasan_report+0xd3/0x150 > > [ 22.269551] ? quarantine_reduce+0x1/0x1a0 > > [ 22.270177] ? copyin+0xea/0x170 > > [ 22.270703] copyin+0xea/0x170 > > [ 22.271202] _copy_from_iter_full+0x14f/0x4f0 > > [ 22.271857] ? __kmalloc+0x1ad/0x2e0 > > [ 22.272420] devkmsg_write+0xb9/0x1a0 > > [ 22.272999] new_sync_write+0xd8/0x130 > > [ 22.273579] vfs_write+0x174/0x2b0 > > [ 22.274113] SyS_write+0x50/0xc0 > > [ 22.274611] do_int80_syscall_32+0x7a/0x1b0 > > [ 22.275216] entry_INT80_compat+0x2d/0x40 > > > > [ 22.276103] Allocated by task 1: > > [ 22.276597] kasan_kmalloc+0x61/0xf0 > > [ 22.277202] __kmalloc+0x1ad/0x2e0 > > [ 22.277720] devkmsg_write+0x76/0x1a0 > > [ 22.278268] new_sync_write+0xd8/0x130 > > [ 22.278826] vfs_write+0x174/0x2b0 > > [ 22.279342] SyS_write+0x50/0xc0 > > [ 22.279840] do_int80_syscall_32+0x7a/0x1b0 > > [ 22.280441] entry_INT80_compat+0x2d/0x40 > > > > [ 22.281326] Freed by task 1: > > [ 22.281788] kasan_slab_free+0xac/0x180 > > [ 22.282354] kfree+0x105/0x310 > > [ 22.282837] unpack_to_rootfs+0x260/0x2a1 > > [ 22.283420] populate_rootfs+0x5d/0x86 > > [ 22.283977] do_one_initcall+0x3b/0x180 > > [ 22.284544] do_basic_setup+0xb4/0xd0 > > [ 22.285091] kernel_init_freeable+0x7b/0xed > > [ 22.285680] kernel_init+0xe/0x110 > > [ 22.286171] ret_from_fork+0x25/0x30
a quite similar KASAN report https://marc.info/?l=linux-kernel&m=150900582526314&w=2 on my box "test_printf: all 260 tests passed". -ss
