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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/platform/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/platform/Makefile')
| -rw-r--r-- | drivers/platform/Makefile | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile new file mode 100644 index 000000000..fa322e7f8 --- /dev/null +++ b/drivers/platform/Makefile @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for linux/drivers/platform +# + +obj-$(CONFIG_X86) += x86/ +obj-$(CONFIG_LOONGARCH) += loongarch/ +obj-$(CONFIG_MELLANOX_PLATFORM) += mellanox/ +obj-$(CONFIG_MIPS) += mips/ +obj-$(CONFIG_OLPC_EC) += olpc/ +obj-$(CONFIG_GOLDFISH) += goldfish/ +obj-$(CONFIG_CHROME_PLATFORMS) += chrome/ +obj-$(CONFIG_CZNIC_PLATFORMS) += cznic/ +obj-$(CONFIG_SURFACE_PLATFORMS) += surface/ +obj-$(CONFIG_ARM64_PLATFORM_DEVICES) += arm64/ +obj-$(CONFIG_BCM2835_VCHIQ) += raspberrypi/ +obj-$(CONFIG_ACPI_WMI) += wmi/ |