We are moving towards separate kernel and module function descriptor
dereference callbacks. This patch enables it for IA64.
For pointers that belong to the kernel
- Added __start_opd and __end_opd pointers, to track the kernel
.opd section address range;
- Added dereference_kernel_function_descriptor(). Now we
will dereference only function pointers that are within
[__start_opd, __end_opd);
For pointers that belong to a module
- Added dereference_module_function_descriptor() to handle module
function descriptor dereference. Now we will dereference only
pointers that are within [module->opd.start, module->opd.end).
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
---
arch/ia64/include/asm/sections.h | 10 +++++++++-
arch/ia64/kernel/module.c | 12 ++++++++++++
arch/ia64/kernel/vmlinux.lds.S | 2 ++
3 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h
index f3481408594e..cea15f2dd38d 100644
--- a/arch/ia64/include/asm/sections.h
+++ b/arch/ia64/include/asm/sections.h
@@ -27,6 +27,8 @@ extern char __start_gate_brl_fsys_bubble_down_patchlist[], __end_gate_brl_fsys_b
extern char __start_unwind[], __end_unwind[];
extern char __start_ivt_text[], __end_ivt_text[];
+#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
+
#undef dereference_function_descriptor
static inline void *dereference_function_descriptor(void *ptr)
{
@@ -38,6 +40,12 @@ static inline void *dereference_function_descriptor(void *ptr)
return ptr;
}
+#undef dereference_kernel_function_descriptor
+static inline void *dereference_kernel_function_descriptor(void *ptr)
+{
+ if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
+ return ptr;
+ return dereference_function_descriptor(ptr);
+}
#endif /* _ASM_IA64_SECTIONS_H */
-
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 853b5611a894..326448f9df16 100644
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -36,6 +36,7 @@
#include <asm/patch.h>
#include <asm/unaligned.h>
+#include <asm/sections.h>
#define ARCH_MODULE_DEBUG 0
@@ -918,3 +919,14 @@ module_arch_cleanup (struct module *mod)
if (mod->arch.core_unw_table)
unw_remove_unwind_table(mod->arch.core_unw_table);
}
+
+void *dereference_module_function_descriptor(struct module *mod, void *ptr)
+{
+ Elf64_Shdr *opd = mod->arch.opd;
+
+ if (ptr < (void *)opd->sh_addr ||
+ ptr >= (void *)(opd->sh_addr + opd->sh_size))
+ return ptr;
+
+ return dereference_function_descriptor(ptr);
+}
diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S
index 58db59da0bd8..31e688981b4b 100644
--- a/arch/ia64/kernel/vmlinux.lds.S
+++ b/arch/ia64/kernel/vmlinux.lds.S
@@ -108,7 +108,9 @@ SECTIONS {
RODATA
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
+ __start_opd = .;
*(.opd)
+ __end_opd = .;
}
/*
--
2.15.0
--
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