* [PATCH v3 11/12] arch/um: don't initialize kasan if it's disabled
[not found] <20250820053459.164825-1-bhe@redhat.com>
@ 2025-08-20 5:34 ` Baoquan He
0 siblings, 0 replies; only message in thread
From: Baoquan He @ 2025-08-20 5:34 UTC (permalink / raw)
To: linux-mm
Cc: ryabinin.a.a, andreyknvl, glider, dvyukov, vincenzo.frascino,
akpm, kasan-dev, linux-kernel, kexec, sj, lorenzo.stoakes, elver,
snovitoll, christophe.leroy, Baoquan He, linux-um
And also add code to enable kasan_flag_enabled, this is for later
usage. Since kasan_init() is called before main(), enabling
kasan_flag_enabled is done in arch_mm_preinit() which is after
jump_label_init() invocation.
And also do the kasan_arg_disabled chekcing before kasan_flag_enabled
enabling to make sure kernel parameter kasan=on|off has been parsed.
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: linux-um@lists.infradead.org
---
arch/um/kernel/mem.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 76bec7de81b5..7b7f838274b5 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -58,6 +58,13 @@ static unsigned long brk_end;
void __init arch_mm_preinit(void)
{
+
+#ifdef CONFIG_KASAN
+ /* Safe to call after jump_label_init(). Enables KASAN. */
+ if (!kasan_arg_disabled)
+ static_branch_enable(&kasan_flag_enabled);
+#endif
+
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
--
2.41.0
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