Messages in this thread | | | Subject | Re: [PATCHv3] habanalabs: fix potential spectre v1 gadgets | From | Jordy Zomer <> | Date | Wed, 2 Feb 2022 20:13:46 +0100 |
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Sorry! Removed the message and hope the line-wrapping is correct now :)
> On 2 Feb 2022, at 20:11, Jordy Zomer <jordy@pwning.systems> wrote: > > It appears like nr could be a Spectre v1 gadget as it's supplied by a > user and used as an array index. Prevent the contents of kernel memory > being leaked to userspace via speculative execution by using > array_index_nospec. > > Signed-off-by: Jordy Zomer <jordy@pwning.systems> > > --- > Changes v1 -> v2: Added the correct offsets > Changes v2 -> v3: Fixed line-wrapping > --- > drivers/misc/habanalabs/common/habanalabs_ioctl.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/misc/habanalabs/common/habanalabs_ioctl.c b/drivers/misc/habanalabs/common/habanalabs_ioctl.c > index 3ba3a8ffda3e..c1cdf712a10d 100644 > --- a/drivers/misc/habanalabs/common/habanalabs_ioctl.c > +++ b/drivers/misc/habanalabs/common/habanalabs_ioctl.c > @@ -14,6 +14,7 @@ > #include <linux/fs.h> > #include <linux/uaccess.h> > #include <linux/slab.h> > +#include <linux/nospec.h> > > static u32 hl_debug_struct_size[HL_DEBUG_OP_TIMESTAMP + 1] = { > [HL_DEBUG_OP_ETR] = sizeof(struct hl_debug_params_etr), > @@ -849,6 +850,7 @@ long hl_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) > } > > if ((nr >= HL_COMMAND_START) && (nr < HL_COMMAND_END)) { > + nr = array_index_nospec(nr, HL_COMMAND_END); > ioctl = &hl_ioctls[nr]; > } else { > dev_err(hdev->dev, "invalid ioctl: pid=%d, nr=0x%02x\n", > @@ -872,6 +874,7 @@ long hl_ioctl_control(struct file *filep, unsigned int cmd, unsigned long arg) > } > > if (nr == _IOC_NR(HL_IOCTL_INFO)) { > + nr = array_index_nospec(nr, _IOC_NR(HL_IOCTL_INFO)+1); > ioctl = &hl_ioctls_control[nr]; > } else { > dev_err(hdev->dev_ctrl, "invalid ioctl: pid=%d, nr=0x%02x\n", > -- > 2.27.0 >
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