linux-kernel - Re: [PATCH] fs/binfmt_elf: Fix memory leak in load_elf

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Date:   Tue, 25 Oct 2022 15:24:41 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, adobriyan@...il.com,
        ebiederm@...ssion.com, lizetao1@...wei.com
Cc:     Kees Cook <keescook@...omium.org>, linux-fsdevel@...r.kernel.org,
        chengzhihao1@...wei.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, yi.zhang@...wei.com
Subject: Re: [PATCH] fs/binfmt_elf: Fix memory leak in load_elf_binary()

On Mon, 24 Oct 2022 23:44:21 +0800, Li Zetao wrote:
> There is a memory leak reported by kmemleak:
> 
>   unreferenced object 0xffff88817104ef80 (size 224):
>     comm "xfs_admin", pid 47165, jiffies 4298708825 (age 1333.476s)
>     hex dump (first 32 bytes):
>       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>       60 a8 b3 00 81 88 ff ff a8 10 5a 00 81 88 ff ff  `.........Z.....
>     backtrace:
>       [<ffffffff819171e1>] __alloc_file+0x21/0x250
>       [<ffffffff81918061>] alloc_empty_file+0x41/0xf0
>       [<ffffffff81948cda>] path_openat+0xea/0x3d30
>       [<ffffffff8194ec89>] do_filp_open+0x1b9/0x290
>       [<ffffffff8192660e>] do_open_execat+0xce/0x5b0
>       [<ffffffff81926b17>] open_exec+0x27/0x50
>       [<ffffffff81a69250>] load_elf_binary+0x510/0x3ed0
>       [<ffffffff81927759>] bprm_execve+0x599/0x1240
>       [<ffffffff8192a997>] do_execveat_common.isra.0+0x4c7/0x680
>       [<ffffffff8192b078>] __x64_sys_execve+0x88/0xb0
>       [<ffffffff83bbf0a5>] do_syscall_64+0x35/0x80
> 
> [...]

Applied to for-next/execve, thanks!

[1/1] fs/binfmt_elf: Fix memory leak in load_elf_binary()
      https://git.kernel.org/kees/c/594d2a14f216

-- 
Kees Cook