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| author | Ali Ahmet Memis <ali@iusegentoo.com> | 2026-08-21 01:45:27 +0000 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2026-08-29 07:32:26 +0100 |
| commit | 78004e9a87f240df03e2f73120d291763c32e0a7 (patch) | |
| tree | 137c22dd795222931b9d2bf2501d37cd766741aa /drivers/media/usb/Makefile | |
| download | linux-stable-78004e9a87f240df03e2f73120d291763c32e0a7.tar.gz linux-stable-78004e9a87f240df03e2f73120d291763c32e0a7.zip | |
openrisc: fix arbitrary kernel memory access via or1k_atomic syscallgrafted
sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user
pointers, v1 and v2, and swaps the words they point to in hand-written
assembly.
l.lwz r29,0(r4)
l.lwz r27,0(r5)
l.sw 0(r4),r27
l.sw 0(r5),r29
The pointers are not checked with access_ok(). The four memory
accesses also have no exception table entries.
A caller passes a kernel address as either pointer, and the syscall
reads from and writes to it directly.
This gives an unprivileged process a kernel read/write primitive. It
overwrites kernel data such as the sys_call_table, gaining code
execution in kernel context.
Check both pointers before entering the critical section. Add fixups
for the four memory accesses so faults on valid but unmapped user
addresses return -EFAULT.
[shorne@gmail.com: fix comment style]
Fixes: 9d02a4283e9c ("OpenRISC: Boot code")
Cc: stable@vger.kernel.org
Signed-off-by: Ali Ahmet Memis <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Diffstat (limited to 'drivers/media/usb/Makefile')
| -rw-r--r-- | drivers/media/usb/Makefile | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/media/usb/Makefile b/drivers/media/usb/Makefile new file mode 100644 index 000000000..6d171beea --- /dev/null +++ b/drivers/media/usb/Makefile @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the USB media device drivers +# + +# DVB USB-only drivers. Please keep it alphabetically sorted by directory name +# (e. g. LC_ALL=C sort Makefile) +obj-y += b2c2/ +obj-y += dvb-usb/ +obj-y += dvb-usb-v2/ +obj-y += s2255/ +obj-y += siano/ +obj-y += ttusb-budget/ +obj-y += ttusb-dec/ + +# Please keep it alphabetically sorted by Kconfig name +# (e. g. LC_ALL=C sort Makefile) +obj-$(CONFIG_DVB_AS102) += as102/ +obj-$(CONFIG_USB_AIRSPY) += airspy/ +obj-$(CONFIG_USB_GSPCA) += gspca/ +obj-$(CONFIG_USB_HACKRF) += hackrf/ +obj-$(CONFIG_USB_MSI2500) += msi2500/ +obj-$(CONFIG_USB_PWC) += pwc/ +obj-$(CONFIG_USB_VIDEO_CLASS) += uvc/ +obj-$(CONFIG_VIDEO_AU0828) += au0828/ +obj-$(CONFIG_VIDEO_CX231XX) += cx231xx/ +obj-$(CONFIG_VIDEO_EM28XX) += em28xx/ +obj-$(CONFIG_VIDEO_GO7007) += go7007/ +obj-$(CONFIG_VIDEO_HDPVR) += hdpvr/ +obj-$(CONFIG_VIDEO_PVRUSB2) += pvrusb2/ +obj-$(CONFIG_VIDEO_STK1160) += stk1160/ +obj-$(CONFIG_VIDEO_USBTV) += usbtv/ |