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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/arm/include/asm/stackprotector.h
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@@ -6,8 +6,10 @@
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  * the stack frame and verifying that it hasn't been overwritten when
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  * returning from the function.  The pattern is called stack canary
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  * and gcc expects it to be defined by a global variable called
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- * "__stack_chk_guard" on ARM.  This unfortunately means that on SMP
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- * we cannot have a different canary value per task.
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+ * "__stack_chk_guard" on ARM.  This prevents SMP systems from using a
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+ * different value for each task unless we enable a GCC plugin that
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+ * replaces these symbol references with references to each task's own
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+ * value.
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  */
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 #ifndef _ASM_STACKPROTECTOR_H
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@@ -15,6 +17,8 @@
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 #include <linux/random.h>
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 #include <linux/version.h>
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+
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+#include <asm/thread_info.h>
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 extern unsigned long __stack_chk_guard;
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@@ -33,7 +37,11 @@
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 	canary ^= LINUX_VERSION_CODE;
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 	current->stack_canary = canary;
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+#ifndef CONFIG_STACKPROTECTOR_PER_TASK
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 	__stack_chk_guard = current->stack_canary;
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+#else
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+	current_thread_info()->stack_canary = current->stack_canary;
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+#endif
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 }
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 #endif	/* _ASM_STACKPROTECTOR_H */