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| author | Tzung-Bi Shih <tzungbi@kernel.org> | 2023-03-24 04:06:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-30 13:51:24 +0300 |
| commit | a0d8644784f73fa39f57f72f374eefaba2bf48a0 (patch) | |
| tree | f6c708a781592786a1915f16b9ebd5e2b7d69107 /drivers/platform/chrome/cros_ec_chardev.c | |
| parent | 8497222b22b591c6b2d106e0e3c1672ffe4e10e0 (diff) | |
| download | linux-a0d8644784f73fa39f57f72f374eefaba2bf48a0.tar.xz | |
platform/chrome: cros_ec_chardev: fix kernel data leak from ioctl
[ Upstream commit b20cf3f89c56b5f6a38b7f76a8128bf9f291bbd3 ]
It is possible to peep kernel page's data by providing larger `insize`
in struct cros_ec_command[1] when invoking EC host commands.
Fix it by using zeroed memory.
[1]: https://elixir.bootlin.com/linux/v6.2/source/include/linux/platform_data/cros_ec_proto.h#L74
Fixes: eda2e30c6684 ("mfd / platform: cros_ec: Miscellaneous character device to talk with the EC")
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Link: https://lore.kernel.org/r/20230324010658.1082361-1-tzungbi@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/platform/chrome/cros_ec_chardev.c')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_chardev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c index 0de7c255254e..d6de5a294128 100644 --- a/drivers/platform/chrome/cros_ec_chardev.c +++ b/drivers/platform/chrome/cros_ec_chardev.c @@ -284,7 +284,7 @@ static long cros_ec_chardev_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg) u_cmd.insize > EC_MAX_MSG_BYTES) return -EINVAL; - s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), + s_cmd = kzalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), GFP_KERNEL); if (!s_cmd) return -ENOMEM; |