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Steven Rostedt 04b80d45ec tracing: Verify event formats that have "%*p.."

commit ea8d7647f9 upstream.

The trace event verifier checks the formats of trace events to make sure
that they do not point at memory that is not in the trace event itself or
in data that will never be freed. If an event references data that was
allocated when the event triggered and that same data is freed before the
event is read, then the kernel can crash by reading freed memory.

The verifier runs at boot up (or module load) and scans the print formats
of the events and checks their arguments to make sure that dereferenced
pointers are safe. If the format uses "%*p.." the verifier will ignore it,
and that could be dangerous. Cover this case as well.

Also add to the sample code a use case of "%*pbl".

Link: https://lore.kernel.org/all/bcba4d76-2c3f-4d11-baf0-02905db953dd@oracle.com/

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: 5013f454a3 ("tracing: Add check of trace event print fmts for dereferencing pointers")
Link: https://lore.kernel.org/20250327195311.2d89ec66@gandalf.local.home
Reported-by: Libo Chen <libo.chen@oracle.com>
Reviewed-by: Libo Chen <libo.chen@oracle.com>
Tested-by: Libo Chen <libo.chen@oracle.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-04-10 14:42:05 +02:00

..

virt: acrn: Fix typos

2024-05-04 18:59:44 +02:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

samples/bpf: Fix broken vmlinux path for VMLINUX_BTF

2025-04-10 14:41:43 +02:00

samples/cgroup: add .gitignore file for generated samples

2024-01-24 11:52:40 -08:00

samples: configfs: add missing MODULE_DESCRIPTION() macro

2024-07-10 14:59:01 +02:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

coresight: syscfg: Example CoreSight configuration loadable module

2021-11-26 11:34:07 -07:00

Add gitignore file for samples/fanotify/ subdirectory

2021-11-07 11:19:24 -08:00

fprobe: add missing MODULE_DESCRIPTION() macro

2024-06-12 08:44:27 +09:00

samples/ftrace: Add support for ftrace direct samples on powerpc

2024-10-31 11:00:55 +11:00

samples/hid: fix broken vmlinux path for VMLINUX_BTF

2025-02-21 14:11:13 +01:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

perf/hw_breakpoint: use ERR_PTR_PCPU(), IS_ERR_PCPU() and PTR_ERR_PCPU() macros

2024-11-05 17:12:32 -08:00

kdb: Rename members of struct kdbtab_t

2021-07-27 17:05:06 +01:00

kfifo: don't include dma-mapping.h in kfifo.h

2024-10-23 08:05:20 +02:00

kmemleak-test: add percpu leak

2024-09-01 20:25:50 -07:00

samples/kobject: add missing MODULE_DESCRIPTION() macros

2024-06-04 18:04:28 +02:00

samples: kprobes: add missing MODULE_DESCRIPTION() macros

2024-06-12 08:44:27 +09:00

samples/landlock: Fix possible NULL dereference in parse_path()

2025-02-08 10:01:15 +01:00

livepatch: Reorder to use before freeing a pointer

2022-03-23 13:51:11 +01:00

samples: mei: don't wait on read completion upon write.

2021-08-01 09:54:22 +02:00

nitro_enclaves: Add fixes for checkpatch blank line reports

2021-09-14 11:11:20 +02:00

samples: Add userspace example for TI TPS6594 PFSM

2023-06-15 13:41:53 +02:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

samples: pktgen: correct dev to DEV

2024-11-13 18:54:33 -08:00

Get rid of 'remove_new' relic from platform driver struct

2024-12-01 15:12:43 -08:00

samples/rpmsg: Introduce a module parameter for message count

2019-08-26 22:10:39 -07:00

rust: finish using custom FFI integer types

2025-02-27 04:34:15 -08:00

samples: user-trap: fix strict-aliasing warning

2024-02-12 10:42:02 -08:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

tracing: Verify event formats that have "%*p.."

2025-04-10 14:42:05 +02:00

…

kbuild: introduce hostprogs-always-y and userprogs-always-y

2020-08-10 01:32:59 +09:00

tracing/user_events: Use write ABI in example

2023-03-29 06:52:09 -04:00

media: samples: v4l2-pci-skeleton.c: drop vb2_ops_wait_prepare/finish

2024-10-28 09:20:10 +01:00

module: Convert symbol namespace to string literal

2024-12-02 11:34:44 -08:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

.gitignore: prefix local generated files with a slash

2021-05-02 00:43:35 +09:00

Kconfig

samples: introduce new samples subdir for cgroup

2023-12-10 16:51:54 -08:00

Makefile

samples: introduce new samples subdir for cgroup

2023-12-10 16:51:54 -08:00