Description
In the Linux kernel, the following vulnerability has been resolved: block: Fix WARNING in _copy_from_iter Syzkaller reports a warning in _copy_from_iter because an iov_iter is supposedly used in the wrong direction. The reason is that syzcaller managed to generate a request with a transfer direction of SG_DXFER_TO_FROM_DEV. This instructs the kernel to copy user buffers into the kernel, read into the copied buffers and then copy the data back to user space. Thus the iovec is used in both directions. Detect this situation in the block layer and construct a new iterator with the correct direction for the copy-in.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9124d3fe21b0947b03f4b87bcfb7acd675d6e85b to < 8fc80874103a5c20aebdc2401361aa01c817f75baffected9124d3fe21b0947b03f4b87bcfb7acd675d6e85b to < 0f1bae071de9967602807472921829a54b2e5956affected9124d3fe21b0947b03f4b87bcfb7acd675d6e85b to < cbaf9be337f7da25742acfce325119e3395b1f1baffected9124d3fe21b0947b03f4b87bcfb7acd675d6e85b to < 13f3956eb5681a4045a8dfdef48df5dc4d9f58a6affected
Linux Linux
Default version status: affected
4.0affected0 to < 4.0unaffected6.1.80 to ≤ 6.1.*unaffected6.6.19 to ≤ 6.6.*unaffected6.7.7 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected