linux-kernel - [PATCH] fs/elf: Fix kernel pointer leak

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Message-Id: <20210929131703.1163417-1-qtxuning1999@sjtu.edu.cn>
Date:   Wed, 29 Sep 2021 21:17:02 +0800
From:   Guo Zhi <qtxuning1999@...u.edu.cn>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Guo Zhi <qtxuning1999@...u.edu.cn>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fs/elf: Fix kernel pointer leak

Pointers should be printed with %p rather than %px
which printed kernel pointer directly.
Change %px to %p to print the secured pointer.

Signed-off-by: Guo Zhi <qtxuning1999@...u.edu.cn>
---
 fs/binfmt_elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index f3523807dbca..440a483656ed 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -393,7 +393,7 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
 
 	if ((type & MAP_FIXED_NOREPLACE) &&
 	    PTR_ERR((void *)map_addr) == -EEXIST)
-		pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n",
+		pr_info("%d (%s): Uhuuh, elf segment at %p requested but the memory is mapped already\n",
 			task_pid_nr(current), current->comm, (void *)addr);
 
 	return(map_addr);
-- 
2.33.0