@@ -14,6 +14,7 @@
#include <linux/ctype.h>
#include <linux/uaccess.h>
#include <linux/of.h>
+#include <linux/kmsan-checks.h>
#include <asm/nvram.h>
#include <asm/rtas.h>
#include <asm/machdep.h>
@@ -41,6 +42,7 @@ static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
int done;
unsigned long flags;
char *p = buf;
+ size_t l;
if (nvram_size == 0 || nvram_fetch == RTAS_UNKNOWN_SERVICE)
@@ -53,6 +55,7 @@ static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
if (i + count > nvram_size)
count = nvram_size - i;
+ l = count;
spin_lock_irqsave(&nvram_lock, flags);
for (; count != 0; count -= len) {
@@ -73,6 +76,7 @@ static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
}
spin_unlock_irqrestore(&nvram_lock, flags);
+ kmsan_unpoison_memory(buf, l);
*index = i;
return p - buf;
rtas_call provides a buffer where the return data should be placed. Rtas initializes the buffer which is not visible to KMSAN so unpoison it manually. Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com> --- arch/powerpc/platforms/pseries/nvram.c | 4 ++++ 1 file changed, 4 insertions(+)