linux-hardening - [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

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Message-Id: <20240425200844.work.184-kees@kernel.org>
Date: Thu, 25 Apr 2024 13:08:50 -0700
From: Kees Cook <keescook@...omium.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: Kees Cook <keescook@...omium.org>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

The /proc/allocinfo file exposes a tremendous about of information about
kernel build details, memory allocations (obviously), and potentially
even image layout (due to ordering). As this is intended to be consumed
by system owners (like /proc/slabinfo), use the same file permissions as
there: 0400.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
---
 lib/alloc_tag.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 26af9982ddc4..531dbe2f5456 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -129,7 +129,7 @@ size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sl
 
 static void __init procfs_init(void)
 {
-	proc_create_seq("allocinfo", 0444, NULL, &allocinfo_seq_op);
+	proc_create_seq("allocinfo", 0400, NULL, &allocinfo_seq_op);
 }
 
 static bool alloc_tag_module_unload(struct codetag_type *cttype,
-- 
2.34.1