Ensure destination ranges of the kexec segments do not overlap
with any kernel pages marked to be preserved across kexec.
For kexec_load, return EADDRNOTAVAIL if overlap is detected.
For kexec_file_load, skip ranges containing preserved pages when
seaching for available ranges to use.
Signed-off-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
---
kernel/kexec_core.c | 3 +++
kernel/kexec_file.c | 5 +++++
2 files changed, 8 insertions(+)
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index c19c0dad1ebe..8c24b546352e 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -37,6 +37,7 @@
#include <linux/compiler.h>
#include <linux/hugetlb.h>
#include <linux/frame.h>
+#include <linux/pkram.h>
#include <asm/page.h>
#include <asm/sections.h>
@@ -176,6 +177,8 @@ int sanity_check_segment_list(struct kimage *image)
return -EADDRNOTAVAIL;
if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT)
return -EADDRNOTAVAIL;
+ if (pkram_has_preserved_pages(mstart, mend))
+ return -EADDRNOTAVAIL;
}
/* Verify our destination addresses do not overlap.
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index f57f72237859..7b14e1b1a178 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -498,6 +498,11 @@ static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
continue;
}
+ if (pkram_has_preserved_pages(temp_start, temp_end + 1)) {
+ temp_start = temp_start - PAGE_SIZE;
+ continue;
+ }
+
/* We found a suitable memory range */
break;
} while (1);
--
2.13.3
