Skip to content

rel_socfpga-5.15.60-lts_22.11.02_pr

rel_socfpga-5.15.60-lts_22.11.02_pr: usb: mon: make mmapped memory read only
@tstruk tstruk tagged this 08 Nov 19:23 
[upstream commit a659daf63d16aa883be42f3f34ff84235c302198]

Syzbot found an issue in usbmon module, where the user space client can
corrupt the monitor's internal memory, causing the usbmon module to
crash the kernel with segfault, UAF, etc.

The reproducer mmaps the /dev/usbmon memory to user space, and
overwrites it with arbitrary data, which causes all kinds of issues.

Return an -EPERM error from mon_bin_mmap() if the flag VM_WRTIE is set.
Also clear VM_MAYWRITE to make it impossible to change it to writable
later.

Cc: "Dmitry Vyukov" <[email protected]>
Cc: stable <[email protected]>
Fixes: 6f23ee1fefdc ("USB: add binary API to usbmon")
Suggested-by: PaX Team <[email protected]>	# for the VM_MAYRITE portion
Link: https://syzkaller.appspot.com/bug?id=2eb1f35d6525fa4a74d75b4244971e5b1411c95a
Reported-by: [email protected]
Signed-off-by: Tadeusz Struk <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Assets 2
Loading