@@ -147,8 +147,24 @@ SECTIONS
#endif
} :text =0xcccc
- /* End of text section, which should occupy whole number of pages */
+#ifdef CONFIG_FG_KASLR
+ /*
+ * -ffunction-sections creates .text.* sections, which are considered
+ * "orphan sections" and added after the first similar section (.text).
+ * Adding this ALIGN statement causes the address of _etext
+ * to be below that of all the .text.* orphaned sections
+ */
+ . = ALIGN(PAGE_SIZE);
+#endif
_etext = .;
+
+ /*
+ * the size of the .text section is used to calculate the address
+ * range for orc lookups. If we just use SIZEOF(.text), we will
+ * miss all the .text.* sections. Calculate the size using _etext
+ * and _stext and save the value for later.
+ */
+ text_size = _etext - _stext;
. = ALIGN(PAGE_SIZE);
X86_ALIGN_RODATA_BEGIN
@@ -813,7 +813,7 @@
. = ALIGN(4); \
.orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
orc_lookup = .; \
- . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
+ . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
LOOKUP_BLOCK_SIZE) + 1) * 4; \
orc_lookup_end = .; \
}
We will be using -ffunction-sections to place each function in it's own text section so it can be randomized at load time. The linker considers these .text.* sections "orphaned sections", and will place them after the first similar section (.text). However, we need to move _etext so that it is after both .text and .text.* We also need to calculate text size to include .text AND .text.* Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> --- arch/x86/kernel/vmlinux.lds.S | 18 +++++++++++++++++- include/asm-generic/vmlinux.lds.h | 2 +- 2 files changed, 18 insertions(+), 2 deletions(-)