[Makedumpfile Patch v3 3/7] x86_64: check physical address in PT_LOAD for none direct mapped regions
Pratyush Anand
panand at redhat.com
Thu Mar 2 00:36:48 PST 2017
A kcore PT_LOAD can have a section from vmalloc region. However,
physical address in that header would be invalid (-1) after kernel
commit 464920104bf7 (/proc/kcore: update physical address for kcore ram
and text). Therefore, check for valid physical address while calculating
page_offset or phys_offset.
Signed-off-by: Pratyush Anand <panand at redhat.com>
---
arch/x86_64.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86_64.c b/arch/x86_64.c
index 893cd516fc8b..e978a36f8878 100644
--- a/arch/x86_64.c
+++ b/arch/x86_64.c
@@ -41,7 +41,8 @@ get_page_offset_x86_64(void)
unsigned long long virt_start;
for (i = 0; get_pt_load(i, &phys_start, NULL, &virt_start, NULL); i++) {
- if (virt_start < __START_KERNEL_map) {
+ if (virt_start < __START_KERNEL_map
+ && phys_start != NOT_PADDR) {
info->page_offset = virt_start - phys_start;
return TRUE;
}
@@ -76,7 +77,8 @@ get_phys_base_x86_64(void)
}
for (i = 0; get_pt_load(i, &phys_start, NULL, &virt_start, NULL); i++) {
- if (virt_start >= __START_KERNEL_map) {
+ if (virt_start >= __START_KERNEL_map
+ && phys_start != NOT_PADDR) {
info->phys_base = phys_start -
(virt_start & ~(__START_KERNEL_map));
--
2.9.3
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