diff options
| 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 /tools/perf/scripts/Build | |
| 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 'tools/perf/scripts/Build')
| -rw-r--r-- | tools/perf/scripts/Build | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/scripts/Build b/tools/perf/scripts/Build new file mode 100644 index 000000000..91229a1fe --- /dev/null +++ b/tools/perf/scripts/Build @@ -0,0 +1,30 @@ +ifeq ($(CONFIG_LIBTRACEEVENT),y) + perf-util-$(CONFIG_LIBPERL) += perl/Perf-Trace-Util/ +endif +perf-util-$(CONFIG_LIBPYTHON) += python/Perf-Trace-Util/ + +ifdef MYPY + PY_TESTS := $(shell find python -type f -name '*.py') + MYPY_TEST_LOGS := $(PY_TESTS:python/%=python/%.mypy_log) +else + MYPY_TEST_LOGS := +endif + +$(OUTPUT)%.mypy_log: % + $(call rule_mkdir) + $(Q)$(call echo-cmd,test)mypy "$<" > $@ || (cat $@ && rm $@ && false) + +perf-y += $(MYPY_TEST_LOGS) + +ifdef PYLINT + PY_TESTS := $(shell find python -type f -name '*.py') + PYLINT_TEST_LOGS := $(PY_TESTS:python/%=python/%.pylint_log) +else + PYLINT_TEST_LOGS := +endif + +$(OUTPUT)%.pylint_log: % + $(call rule_mkdir) + $(Q)$(call echo-cmd,test)pylint "$<" > $@ || (cat $@ && rm $@ && false) + +perf-y += $(PYLINT_TEST_LOGS) |