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filemon_ioctl: check fd for write permission 

Reviewed by: christos
Reported by: ivansprundel
This commit is contained in:
sjg 2019-10-30 18:35:06 +00:00
parent 98a714e52e
commit 5aba0d09b5
1 changed files with 7 additions and 2 deletions
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9
sys/dev/filemon/filemon.c
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@ -1,4 +1,4 @@
/* $NetBSD: filemon.c,v 1.30 2018/06/06 01:49:08 maya Exp $ */
/* $NetBSD: filemon.c,v 1.31 2019/10/30 18:35:06 sjg Exp $ */
/*
* Copyright (c) 2010, Juniper Networks, Inc.
*
@ -25,7 +25,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: filemon.c,v 1.30 2018/06/06 01:49:08 maya Exp $");
__KERNEL_RCSID(0, "$NetBSD: filemon.c,v 1.31 2019/10/30 18:35:06 sjg Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -315,6 +315,11 @@ filemon_ioctl(struct file * fp, u_long cmd, void *data)
error = EBADF;
break;
}
if ((filemon->fm_fp->f_flag & FWRITE) == 0) {
closef(filemon->fm_fp);
filemon->fm_fp = NULL;
return (EBADF);
}
/* Write the file header. */
filemon_comment(filemon);
break;