CVE-2023-53093: In the Linux kernel, the following vulnerability has been resolved:  tracing: Do not let histogram values have some modifiers  Histogram values can not be strings, stacktraces, graphs, symbols, syscalls, or grouped in buckets or log. Give an error if a value is set to do so.  Note, the histogram code was not prepared to handle these modifiers for histograms and caused a bug.  Mark Rutland reported:   # echo 'p:copy_to_user __arch_copy_to_user n=$arg2' >> /sys/kernel/tracing/kprobe_events  # echo 'hist:keys=n:vals=hitcount.buckets=8:sort=hitcount' > /sys/kernel/tracing/events/kprobes/copy_to_user/trigger  # cat /sys/kernel/tracing/events/kprobes/copy_to_user/hist [  143.694628] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [  143.695190] Mem abort info: [  143.695362]   ESR = 0x0000000096000004 [  143.695604]   EC = 0x25: DABT (current EL), IL = 32 bits [  143.695889]   SET = 0, FnV = 0 [  143.696077]   EA = 0, S1PTW = 0 [  143.696302]   FSC = 0x04: level 0 translation fault [  143.702381] Data abort info: [  143.702614]   ISV = 0, ISS = 0x00000004 [  143.702832]   CM = 0, WnR = 0 [  143.703087] user pgtable: 4k pages, 48-bit VAs, pgdp=00000000448f9000 [  143.703407] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [  143.704137] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP [  143.704714] Modules linked in: [  143.705273] CPU: 0 PID: 133 Comm: cat Not tainted 6.2.0-00003-g6fc512c10a7c #3 [  143.706138] Hardware name: linux,dummy-virt (DT) [  143.706723] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [  143.707120] pc : hist_field_name.part.0+0x14/0x140 [  143.707504] lr : hist_field_name.part.0+0x104/0x140 [  143.707774] sp : ffff800008333a30 [  143.707952] x29: ffff800008333a30 x28: 0000000000000001 x27: 0000000000400cc0 [  143.708429] x26: ffffd7a653b20260 x25: 0000000000000000 x24: ffff10d303ee5800 [  143.708776] x23: ffffd7a6539b27b0 x22: ffff10d303fb8c00 x21: 0000000000000001 [  143.709127] x20: ffff10d303ec2000 x19: 0000000000000000 x18: 0000000000000000 [  143.709478] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [  143.709824] x14: 0000000000000000 x13: 203a6f666e692072 x12: 6567676972742023 [  143.710179] x11: 0a230a6d6172676f x10: 000000000000002c x9 : ffffd7a6521e018c [  143.710584] x8 : 000000000000002c x7 : 7f7f7f7f7f7f7f7f x6 : 000000000000002c [  143.710915] x5 : ffff10d303b0103e x4 : ffffd7a653b20261 x3 : 000000000000003d [  143.711239] x2 : 0000000000020001 x1 : 0000000000000001 x0 : 0000000000000000 [  143.711746] Call trace: [  143.712115]  hist_field_name.part.0+0x14/0x140 [  143.712642]  hist_field_name.part.0+0x104/0x140 [  143.712925]  hist_field_print+0x28/0x140 [  143.713125]  event_hist_trigger_print+0x174/0x4d0 [  143.713348]  hist_show+0xf8/0x980 [  143.713521]  seq_read_iter+0x1bc/0x4b0 [  143.713711]  seq_read+0x8c/0xc4 [  143.713876]  vfs_read+0xc8/0x2a4 [  143.714043]  ksys_read+0x70/0xfc [  143.714218]  __arm64_sys_read+0x24/0x30 [  143.714400]  invoke_syscall+0x50/0x120 [  143.714587]  el0_svc_common.constprop.0+0x4c/0x100 [  143.714807]  do_el0_svc+0x44/0xd0 [  143.714970]  el0_svc+0x2c/0x84 [  143.715134]  el0t_64_sync_handler+0xbc/0x140 [  143.715334]  el0t_64_sync+0x190/0x194 [  143.715742] Code: a9bd7bfd 910003fd a90153f3 aa0003f3 (f9400000) [  143.716510] ---[ end trace 0000000000000000 ]--- Segmentation fault