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 3d578c6fefee..e0d52f70cb48 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -40,6 +40,7 @@
#include <linux/hugetlb.h>
#include <linux/objtool.h>
#include <linux/kmsg_dump.h>
+#include <linux/pkram.h>
#include <asm/page.h>
#include <asm/sections.h>
@@ -178,6 +179,8 @@ 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 ca2aa2d61955..8bca01060d32 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -490,6 +490,11 @@ static int locate_mem_hole_bottom_up(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);
--
1.9.4
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