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authorJakub Kicinski <kuba@kernel.org>2025-11-13 12:32:50 -0800
committerJakub Kicinski <kuba@kernel.org>2025-11-13 12:35:38 -0800
commitc99ebb6132595b4b288a413981197eb076547c5a (patch)
tree6ef2de29b7afb5f1107b8e11489c09f0a5290260 /arch/riscv/kernel/stacktrace.c
parentf694d215d34035cc64b1d176fd82db0d1f2428d4 (diff)
parentd0309c054362a235077327b46f727bc48878a3bc (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR (net-6.18-rc6). No conflicts, adjacent changes in: drivers/net/phy/micrel.c 96a9178a29a6 ("net: phy: micrel: lan8814 fix reset of the QSGMII interface") 61b7ade9ba8c ("net: phy: micrel: Add support for non PTP SKUs for lan8814") and a trivial one in tools/testing/selftests/drivers/net/Makefile. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'arch/riscv/kernel/stacktrace.c')
-rw-r--r--arch/riscv/kernel/stacktrace.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index 3fe9e6edef8f..b41b6255751c 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -16,6 +16,22 @@
#ifdef CONFIG_FRAME_POINTER
+/*
+ * This disables KASAN checking when reading a value from another task's stack,
+ * since the other task could be running on another CPU and could have poisoned
+ * the stack in the meantime.
+ */
+#define READ_ONCE_TASK_STACK(task, x) \
+({ \
+ unsigned long val; \
+ unsigned long addr = x; \
+ if ((task) == current) \
+ val = READ_ONCE(addr); \
+ else \
+ val = READ_ONCE_NOCHECK(addr); \
+ val; \
+})
+
extern asmlinkage void handle_exception(void);
extern unsigned long ret_from_exception_end;
@@ -69,8 +85,9 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
fp = frame->ra;
pc = regs->ra;
} else {
- fp = frame->fp;
- pc = ftrace_graph_ret_addr(current, &graph_idx, frame->ra,
+ fp = READ_ONCE_TASK_STACK(task, frame->fp);
+ pc = READ_ONCE_TASK_STACK(task, frame->ra);
+ pc = ftrace_graph_ret_addr(current, &graph_idx, pc,
&frame->ra);
if (pc >= (unsigned long)handle_exception &&
pc < (unsigned long)&ret_from_exception_end) {