Tadeusz Struk 5ff80339cd usb: mon: make mmapped memory read only ... commit a659daf63d upstream. 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" <dvyukov@google.com> Cc: stable <stable@kernel.org> Fixes: 6f23ee1fef ("USB: add binary API to usbmon") Suggested-by: PaX Team <pageexec@freemail.hu> # for the VM_MAYRITE portion Link: https://syzkaller.appspot.com/bug?id=2eb1f35d6525fa4a74d75b4244971e5b1411c95a Reported-by: syzbot+23f57c5ae902429285d7@syzkaller.appspotmail.com Signed-off-by: Tadeusz Struk <tadeusz.struk@linaro.org> Link: https://lore.kernel.org/r/20220919215957.205681-1-tadeusz.struk@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-10-12 09:53:28 +02:00
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Kconfig	…
Makefile	…
mon_bin.c	usb: mon: make mmapped memory read only	2022-10-12 09:53:28 +02:00
mon_main.c	…
mon_stat.c	…
mon_text.c	USB: mon: Use scnprintf() for avoiding potential buffer overflow	2020-03-12 09:49:28 +01:00
usb_mon.h	…