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platform/chrome: cros_ec_dev - double fetch bug in ioctl

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commit 096cdc6f52 upstream.

We verify "u_cmd.outsize" and "u_cmd.insize" but we need to make sure
that those values have not changed between the two copy_from_user()
calls.  Otherwise it could lead to a buffer overflow.

Additionally, cros_ec_cmd_xfer() can set s_cmd->insize to a lower value.
We should use the new smaller value so we don't copy too much data to
the user.

Reported-by: Pengfei Wang <wpengfeinudt@gmail.com>
Fixes: a841178445 ('mfd: cros_ec: Use a zero-length array for command data')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter
2016-06-21 16:58:46 +03:00
committed by popcornmix
parent 75d2d989e5
commit e3767d74c7
1 changed files with 7 additions and 1 deletions
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8
drivers/platform/chrome/cros_ec_dev.c
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@@ -147,13 +147,19 @@ static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
goto exit; goto exit;
} }
if (u_cmd.outsize != s_cmd->outsize ||
u_cmd.insize != s_cmd->insize) {
ret = -EINVAL;
goto exit;
}
s_cmd->command += ec->cmd_offset; s_cmd->command += ec->cmd_offset;
ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd); ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
/* Only copy data to userland if data was received. */ /* Only copy data to userland if data was received. */
if (ret < 0) if (ret < 0)
goto exit; goto exit;
if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + u_cmd.insize)) if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize))
ret = -EFAULT; ret = -EFAULT;
exit: exit:
kfree(s_cmd); kfree(s_cmd);