Handle .livepatch.hooks* and .altinstr_replacement sections as the
special sections with assigned group_size resolution function.
By default each .livepatch.hooks* sections' entry is 8 bytes long (a
pointer). The .altinstr_replacement section has undefined group_size.
Allow to specify different .livepatch.hooks* section entry size using
shell environment variable HOOK_STRUCT_SIZE.
Signed-off-by: Pawel Wieczorkiewicz <wipawel@xxxxxxxxx>
Reviewed-by: Andra-Irina Paraschiv <andraprs@xxxxxxxxxx>
Reviewed-by: Bjoern Doebel <doebel@xxxxxxxxx>
Reviewed-by: Norbert Manthey <nmanthey@xxxxxxxxx>
---
v2:
* Applied suggestions from Ross and neccessary changes enforced by
previous patch of the series:
- fixed indentation
- used log_debug() instead of printf()
- added aux. function undefined_group_size() returning 0 for a
undefined group_size
- added .altinstr_replacement to the special_sections array and
fixed its group_size to undefined (0).
---
create-diff-object.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/create-diff-object.c b/create-diff-object.c
index c6183c3..8365af0 100644
--- a/create-diff-object.c
+++ b/create-diff-object.c
@@ -995,6 +995,24 @@ static int altinstructions_group_size(struct kpatch_elf
*kelf, int offset)
return size;
}
+static int livepatch_hooks_group_size(struct kpatch_elf *kelf, int offset)
+{
+ static int size = 0;
+ char *str;
+ if (!size) {
+ str = getenv("HOOK_STRUCT_SIZE");
+ size = str ? atoi(str) : 8;
+ }
+
+ log_debug("livepatch_hooks_size=%d\n", size);
+ return size;
+}
+
+static int undefined_group_size(struct kpatch_elf *kelf, int offset)
+{
+ return 0;
+}
+
/*
* The rela groups in the .fixup section vary in size. The beginning of each
* .fixup rela group is referenced by the .ex_table section. To find the size
@@ -1072,6 +1090,18 @@ static struct special_section special_sections[] = {
.name = ".altinstructions",
.group_size = altinstructions_group_size,
},
+ {
+ .name = ".altinstr_replacement",
+ .group_size = undefined_group_size,
+ },
+ {
+ .name = ".livepatch.hooks.load",
+ .group_size = livepatch_hooks_group_size,
+ },
+ {
+ .name = ".livepatch.hooks.unload",
+ .group_size = livepatch_hooks_group_size,
+ },
{},
};
