[Xen-devel] [PATCH v3 2/9] livepatch: Deal with payloads without any .text

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

It is possible. Especially if the only thing they do is
NOP functions - in which case there is only .livepatch.funcs
sections.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

---
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

v3: First submission.
---
 xen/common/livepatch.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 47a23cf..17427b1 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -399,16 +399,17 @@ static int move_payload(struct payload *payload, struct 
livepatch_elf *elf)
 
 static int secure_payload(struct payload *payload, struct livepatch_elf *elf)
 {
-    int rc;
+    int rc = 0;
     unsigned int text_pages, rw_pages, ro_pages;
 
     text_pages = PFN_UP(payload->text_size);
-    ASSERT(text_pages);
-
-    rc = arch_livepatch_secure(payload->text_addr, text_pages, 
LIVEPATCH_VA_RX);
-    if ( rc )
-        return rc;
 
+    if ( text_pages )
+    {
+        rc = arch_livepatch_secure(payload->text_addr, text_pages, 
LIVEPATCH_VA_RX);
+        if ( rc )
+            return rc;
+    }
     rw_pages = PFN_UP(payload->rw_size);
     if ( rw_pages )
     {
-- 
2.4.11


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