If the livepatch has only .rodata sections then it is OK to also
apply/revert/apply the livepatch without having to worry about the
unforseen consequences.
See commit 98b728a7b235c67e210f67f789db5d9eb38ca00c
"livepatch: Disallow applying after an revert" for details.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
---
v3: New patch
---
xen/common/livepatch.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 66d532db14..a1f54c42d3 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -417,9 +417,12 @@ static int move_payload(struct payload *payload, struct
livepatch_elf *elf)
}
}
- /* Only one RW section with non-zero size: .livepatch.funcs */
- if ( rw_buf_cnt == 1 &&
- !strcmp(elf->sec[rw_buf_sec].name, ELF_LIVEPATCH_FUNC) )
+ /*
+ * Only one RW section with non-zero size: .livepatch.funcs,
+ * or only RO sections.
+ */
+ if ( !rw_buf_cnt || (rw_buf_cnt == 1 &&
+ !strcmp(elf->sec[rw_buf_sec].name, ELF_LIVEPATCH_FUNC)) )
payload->safe_to_reapply = true;
out:
xfree(offset);
--
2.13.3
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