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[PATCH] LSM: add missing hook to do_compat_readv_writev()

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This patch addresses a flaw in LSM, where there is no mediation of readv()
and writev() in for 32-bit compatible apps using a 64-bit kernel.

This bug was discovered and fixed initially in the native readv/writev
code [1], but was not fixed in the compat code.  Thanks to Al for spotting
this one.

  [1] http://lwn.net/Articles/154282/

Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
James Morris
2006-04-26 02:45:03 -04:00
committed by Linus Torvalds
parent a090d9132c
commit e7edf9cded
1 changed files with 4 additions and 0 deletions
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4
fs/compat.c
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@@ -1217,6 +1217,10 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
if (ret < 0) if (ret < 0)
goto out; goto out;
ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
if (ret)
goto out;
fnv = NULL; fnv = NULL;
if (type == READ) { if (type == READ) {
fn = file->f_op->read; fn = file->f_op->read;