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[v3,07/29] x86: Restore "text" Program Header with dummy section

Message ID 20191029211351.13243-8-keescook@chromium.org (mailing list archive)
State Not Applicable
Headers show
Series vmlinux.lds.h: Refactor EXCEPTION_TABLE and NOTES | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch success Successfully applied on branch powerpc/merge (ac35ea27aebf23d7bc698231a18e7606bd7a24b2)
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked

Commit Message

Kees Cook Oct. 29, 2019, 9:13 p.m. UTC 
In a linker script, if once places a section in one or more segments using
":PHDR", then the linker will place all subsequent allocatable sections,
which do not specify ":PHDR", into the same segments. In order to have
the NOTES section in both PT_LOAD (":text") and PT_NOTE (":note"), both
segments are marked, and the only way to to undo this to keep subsequent
sections out of PT_NOTE is to mark the following section with just the
single desired PT_LOAD (":text").

In preparation for having a common NOTES macro, perform the segment
assignment use a dummy section (as done by other architectures).

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 arch/x86/kernel/vmlinux.lds.S | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index e2feacf921a0..788e78978030 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -147,8 +147,9 @@  SECTIONS
 	} :text = 0x9090
 
 	NOTES :text :note
+	.dummy : { *(.dummy) } :text
 
-	EXCEPTION_TABLE(16) :text = 0x9090
+	EXCEPTION_TABLE(16)
 
 	/* .text should occupy whole number of pages */
 	. = ALIGN(PAGE_SIZE);