Commit d180e5c0 authored Jul 30, 2024 by Alessio Balsini

Relax ACLs for kprobe-related files in tracing sysfs



Among the /sys/kernel/tracing files that are already writable,
kprobes-related files and folders were not. This would prevent anyone
except root to read or write these files.
This patch extends the ACL permissions of kprobe event files with read
and write permissions to everyone, aiming at allowing traced (part of
Perfetto) and shell to use this kernel tracing feature. This extension
is limited to userdebug builds.

Bug: 359542775
Test: traced succeeds in creating and activating kprobe events
Change-Id: I6aa13e34987a5bf89a5a96b41d64dbb498aca0ae
Signed-off-by: Alessio Balsini <balsini@google.com>

parent d4497977

cmds/atrace/atrace_userdebug.rc

+4 −0

Original line number	Diff line number	Diff line
		@@ -24,3 +24,7 @@ on post-fs
		chmod 0666 /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/filter
		chmod 0666 /sys/kernel/tracing/events/raw_syscalls/sys_exit/filter
		chmod 0666 /sys/kernel/debug/tracing/events/raw_syscalls/sys_exit/filter

		# Allow traced_probes to use the kprobe interface
		chmod 0666 /sys/kernel/debug/tracing/kprobe_events
		chmod 0666 /sys/kernel/tracing/kprobe_events