The patch titled
Subject: kasan-detect-negative-size-in-memory-operation-function-fix-2
has been added to the -mm tree. Its filename is
kasan-detect-negative-size-in-memory-operation-function-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-detect-negative-size-in-memory-operation-function-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-detect-negative-size-in-memory-operation-function-fix-2.patch
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------------------------------------------------------
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: kasan-detect-negative-size-in-memory-operation-function-fix-2
fix objtool warning
mm/kasan/common.o: warning: objtool: kasan_report()+0x13: call to report_enabled() with UACCESS enabled
Link: http://lkml.kernel.org/r/20200305095436.GV2596@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reviewed-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Tested-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/common.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/mm/kasan/common.c~kasan-detect-negative-size-in-memory-operation-function-fix-2
+++ a/mm/kasan/common.c
@@ -641,16 +641,17 @@ extern bool report_enabled(void);
bool kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip)
{
- unsigned long flags;
+ unsigned long flags = user_access_save();
+ bool ret = false;
- if (likely(!report_enabled()))
- return false;
+ if (likely(report_enabled())) {
+ __kasan_report(addr, size, is_write, ip);
+ ret = true;
+ }
- flags = user_access_save();
- __kasan_report(addr, size, is_write, ip);
user_access_restore(flags);
- return true;
+ return ret;
}
#ifdef CONFIG_MEMORY_HOTPLUG
_
Patches currently in -mm which might be from peterz@xxxxxxxxxxxxx are
kasan-detect-negative-size-in-memory-operation-function-fix-2.patch
