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security: revalidate rw permissions for sys_splice and sys_vmsplice

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Revalidate read/write permissions for splice(2) and vmslice(2), in case
security policy has changed since the files were opened.

Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
James Morris 2007-07-13 11:44:32 +02:00 committed by Jens Axboe
parent d3f35d98b3
commit 29ce20586b
1 changed files with 9 additions and 0 deletions
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9
fs/splice.c
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@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/uio.h>
#include <linux/security.h>
/*
* Attempt to steal a page from a pipe buffer. This should perhaps go into
@ -961,6 +962,10 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
if (unlikely(ret < 0))
return ret;
ret = security_file_permission(out, MAY_WRITE);
if (unlikely(ret < 0))
return ret;
return out->f_op->splice_write(pipe, out, ppos, len, flags);
}
@ -983,6 +988,10 @@ static long do_splice_to(struct file *in, loff_t *ppos,
if (unlikely(ret < 0))
return ret;
ret = security_file_permission(in, MAY_READ);
if (unlikely(ret < 0))
return ret;
return in->f_op->splice_read(in, ppos, pipe, len, flags);
}