32 lines
1.1 KiB
Diff
32 lines
1.1 KiB
Diff
From 862ed307cdb6281d669ac6a3124b109bac9d401c Mon Sep 17 00:00:00 2001
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From: Amir Goldstein <amir73il@gmail.com>
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Date: Thu, 10 Jul 2025 12:08:30 +0200
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Subject: fuse: do not allow mapping a non-regular backing file
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We do not support passthrough operations other than read/write on
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regular file, so allowing non-regular backing files makes no sense.
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Fixes: efad7153bf93 ("fuse: allow O_PATH fd for FUSE_DEV_IOC_BACKING_OPEN")
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Cc: stable@vger.kernel.org
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Signed-off-by: Amir Goldstein <amir73il@gmail.com>
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Reviewed-by: Bernd Schubert <bschubert@ddn.com>
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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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---
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fs/fuse/passthrough.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/fs/fuse/passthrough.c
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+++ b/fs/fuse/passthrough.c
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@@ -237,6 +237,11 @@ int fuse_backing_open(struct fuse_conn *
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if (!file)
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goto out;
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+ /* read/write/splice/mmap passthrough only relevant for regular files */
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+ res = d_is_dir(file->f_path.dentry) ? -EISDIR : -EINVAL;
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+ if (!d_is_reg(file->f_path.dentry))
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+ goto out_fput;
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+
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backing_sb = file_inode(file)->i_sb;
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res = -ELOOP;
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if (backing_sb->s_stack_depth >= fc->max_stack_depth)
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