Signed-off-by: bevis_chen <bevis_chen@xxxxxxxx>
---
arm64.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arm64.c b/arm64.c
index b3040d7..50dd458 100644
--- a/arm64.c
+++ b/arm64.c
@@ -92,6 +92,7 @@ static void arm64_get_crash_notes(void);
static void arm64_calc_VA_BITS(void);
static int arm64_is_uvaddr(ulong, struct task_context *);
static void arm64_calc_KERNELPACMASK(void);
+static void arm64_recalc_KERNELPACMASK(void);
static int arm64_get_vmcoreinfo(unsigned long *vaddr, const char *label, int base);
struct kernel_range {
@@ -581,6 +582,17 @@ arm64_init(int when)
if (!machdep->hz)
machdep->hz = 100;
+ /*
+ * In the case of using ramdump rather than vmcore,
+ * will fail to parse out KERNELPAC.
+ * So we check if the "sturct ptrauth_keys_kernel" exits
+ * as a basis for whether PAC feature is enabled or not.
+ * If yes, then we use vabits to figure out pac bitmask.
+ */
+ if(!machdep->machspec->CONFIG_ARM64_KERNELPACMASK)
+ arm64_recalc_KERNELPACMASK();
+
+
arm64_irq_stack_init();
arm64_overflow_stack_init();
arm64_stackframe_init();
@@ -4921,6 +4933,21 @@ static void arm64_calc_KERNELPACMASK(void)
}
}
+
+#define GENMASK_UL(h, l) \
+ (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+
+static void arm64_recalc_KERNELPACMASK(void){
+ /* arm64: check if pac already enabled yet from related structure.*/
+ if (STRUCT_EXISTS("ptrauth_keys_kernel") && machdep->machspec->VA_BITS_ACTUAL){
+ machdep->machspec->CONFIG_ARM64_KERNELPACMASK =
+ GENMASK_UL(63, machdep->machspec->VA_BITS_ACTUAL);
+ if (CRASHDEBUG(1))
+ fprintf(fp, "CONFIG_ARM64_KERNELPACMASK: %lx\n",
+ machdep->machspec->CONFIG_ARM64_KERNELPACMASK);
+ }
+}
+
#endif /* ARM64 */
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