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Add a paragraph explaining what sort of capabilities a process would need to read procfs data for some other process. Also mention that reading data for its own process doesn't require any extra permissions. Link: https://lkml.kernel.org/r/20250129001747.759990-1-andrii@kernel.org Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jann Horn <jannh@google.com> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: "Mike Rapoport (IBM)" <rppt@kernel.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>