From ae664e824e3e4a85dbe857815d269f209d998e36 Mon Sep 17 00:00:00 2001 From: Liang Zhen Date: Tue, 22 Mar 2016 19:03:48 -0400 Subject: [PATCH] staging: lustre: libcfs: replace LNET_MAX_IOCTL_BUF_LEN with something bigger The size of LNET_MAX_IOCTL_BUF_LEN restricts the size of libcfs ioctl to the maximum needs of the LNet layer. Since libcfs also handles things like debugging we might need to let user land pass more data to or from the kernel than what is possible Signed-off-by: Liang Zhen Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5435 Reviewed-on: http://review.whamcloud.com/11313 Reviewed-by: Bobi Jam Reviewed-by: Johann Lombardi Reviewed-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h | 3 +++ drivers/staging/lustre/lnet/libcfs/module.c | 5 +---- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h index 5ca99bd6f4e9..c71d1250ff96 100644 --- a/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h +++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h @@ -49,6 +49,9 @@ struct libcfs_ioctl_hdr { __u32 ioc_version; }; +/** max size to copy from userspace */ +#define LIBCFS_IOC_DATA_MAX (128 * 1024) + struct libcfs_ioctl_data { struct libcfs_ioctl_hdr ioc_hdr; diff --git a/drivers/staging/lustre/lnet/libcfs/module.c b/drivers/staging/lustre/lnet/libcfs/module.c index cdc640bfdba8..f9f9d59052f8 100644 --- a/drivers/staging/lustre/lnet/libcfs/module.c +++ b/drivers/staging/lustre/lnet/libcfs/module.c @@ -54,9 +54,6 @@ # define DEBUG_SUBSYSTEM S_LNET -#define LNET_MAX_IOCTL_BUF_LEN (sizeof(struct lnet_ioctl_net_config) + \ - sizeof(struct lnet_ioctl_config_data)) - #include "../../include/linux/libcfs/libcfs.h" #include @@ -186,7 +183,7 @@ static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd, * do a check here to restrict the size of the memory * to allocate to guard against DoS attacks. */ - if (buf_len > LNET_MAX_IOCTL_BUF_LEN) { + if (buf_len > LIBCFS_IOC_DATA_MAX) { CERROR("LNET: user buffer exceeds kernel buffer\n"); return -EINVAL; } -- 2.39.5