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[mm,v2,26/33] kasan: introduce complete_report_info

Message ID 5ed013df1b173806eb7aecccd2254aa46d3abe56.1658189199.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series kasan: switch tag-based modes to stack ring from per-object metadata | expand

Commit Message

andrey.konovalov@linux.dev July 19, 2022, 12:10 a.m. UTC 
From: Andrey Konovalov <andreyknvl@google.com>

Introduce a complete_report_info() function that fills in the
first_bad_addr field of kasan_report_info instead of doing it in
kasan_report_*().

This function will be extended in the next patch.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/kasan/kasan.h  |  5 ++++-
 mm/kasan/report.c | 17 +++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)
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Patch

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 4fddfdb08abf..7e07115873d3 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -153,12 +153,15 @@  enum kasan_report_type {
 };
 
 struct kasan_report_info {
+	/* Filled in by kasan_report_*(). */
 	enum kasan_report_type type;
 	void *access_addr;
-	void *first_bad_addr;
 	size_t access_size;
 	bool is_write;
 	unsigned long ip;
+
+	/* Filled in by the common reporting code. */
+	void *first_bad_addr;
 };
 
 /* Do not change the struct layout: compiler ABI. */
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index dc38ada86f85..0c2e7a58095d 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -413,6 +413,17 @@  static void print_report(struct kasan_report_info *info)
 	}
 }
 
+static void complete_report_info(struct kasan_report_info *info)
+{
+	void *addr = kasan_reset_tag(info->access_addr);
+
+	if (info->type == KASAN_REPORT_ACCESS)
+		info->first_bad_addr = kasan_find_first_bad_addr(
+					info->access_addr, info->access_size);
+	else
+		info->first_bad_addr = addr;
+}
+
 void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_type type)
 {
 	unsigned long flags;
@@ -430,11 +441,12 @@  void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_ty
 
 	info.type = type;
 	info.access_addr = ptr;
-	info.first_bad_addr = kasan_reset_tag(ptr);
 	info.access_size = 0;
 	info.is_write = false;
 	info.ip = ip;
 
+	complete_report_info(&info);
+
 	print_report(&info);
 
 	end_report(&flags, ptr);
@@ -463,11 +475,12 @@  bool kasan_report(unsigned long addr, size_t size, bool is_write,
 
 	info.type = KASAN_REPORT_ACCESS;
 	info.access_addr = ptr;
-	info.first_bad_addr = kasan_find_first_bad_addr(ptr, size);
 	info.access_size = size;
 	info.is_write = is_write;
 	info.ip = ip;
 
+	complete_report_info(&info);
+
 	print_report(&info);
 
 	end_report(&irq_flags, ptr);