From: sumit.saxena@avagotech.com Date: Thu, 15 Oct 2015 08:10:54 +0000 (+0530) Subject: megaraid_sas : SMAP restriction--do not access user memory from IOCTL code X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=323c4a02c631d00851d8edc4213c4d184ef83647;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git megaraid_sas : SMAP restriction--do not access user memory from IOCTL code This is an issue on SMAP enabled CPUs and 32 bit apps running on 64 bit OS. Do not access user memory from kernel code. The SMAP bit restricts accessing user memory from kernel code. Cc: Signed-off-by: Sumit Saxena Signed-off-by: Kashyap Desai Reviewed-by: Tomas Henzl Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 071ea1cad41c..cc953725d9be 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -6470,6 +6470,9 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg) int i; int error = 0; compat_uptr_t ptr; + unsigned long local_raw_ptr; + u32 local_sense_off; + u32 local_sense_len; if (clear_user(ioc, sizeof(*ioc))) return -EFAULT; @@ -6487,9 +6490,15 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg) * sense_len is not null, so prepare the 64bit value under * the same condition. */ - if (ioc->sense_len) { + if (get_user(local_raw_ptr, ioc->frame.raw) || + get_user(local_sense_off, &ioc->sense_off) || + get_user(local_sense_len, &ioc->sense_len)) + return -EFAULT; + + + if (local_sense_len) { void __user **sense_ioc_ptr = - (void __user **)(ioc->frame.raw + ioc->sense_off); + (void __user **)((u8*)local_raw_ptr + local_sense_off); compat_uptr_t *sense_cioc_ptr = (compat_uptr_t *)(cioc->frame.raw + cioc->sense_off); if (get_user(ptr, sense_cioc_ptr) ||