This is a note to let you know that I've just added the patch titled
modpost: Add '.ltext' and '.ltext.*' to TEXT_SECTIONS
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
modpost-add-.ltext-and-.ltext.-to-text_sections.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e4a13ccef32375884dd266b8ba59d697f359bb84
Author: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Tue Jan 23 15:59:55 2024 -0700
modpost: Add '.ltext' and '.ltext.*' to TEXT_SECTIONS
[ Upstream commit 397586506c3da005b9333ce5947ad01e8018a3be ]
After the linked LLVM change, building ARCH=um defconfig results in a
segmentation fault in modpost. Prior to commit a23e7584ecf3 ("modpost:
unify 'sym' and 'to' in default_mismatch_handler()"), there was a
warning:
WARNING: modpost: vmlinux.o(__ex_table+0x88): Section mismatch in reference to the .ltext:(unknown)
WARNING: modpost: The relocation at __ex_table+0x88 references
section ".ltext" which is not in the list of
authorized sections. If you're adding a new section
and/or if this reference is valid, add ".ltext" to the
list of authorized sections to jump to on fault.
This can be achieved by adding ".ltext" to
OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.
The linked LLVM change moves global objects to the '.ltext' (and
'.ltext.*' with '-ffunction-sections') sections with '-mcmodel=large',
which ARCH=um uses. These sections should be handled just as '.text'
and '.text.*' are, so add them to TEXT_SECTIONS.
Cc: stable@xxxxxxxxxxxxxxx
Closes: https://github.com/ClangBuiltLinux/linux/issues/1981
Link: https://github.com/llvm/llvm-project/commit/4bf8a688956a759b7b6b8d94f42d25c13c7af130
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 43bacdee5cc5d..201ac1bf5030d 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -937,7 +937,8 @@ static void check_section(const char *modname, struct elf_info *elf,
#define DATA_SECTIONS ".data", ".data.rel"
#define TEXT_SECTIONS ".text", ".text.*", ".sched.text", \
- ".kprobes.text", ".cpuidle.text", ".noinstr.text"
+ ".kprobes.text", ".cpuidle.text", ".noinstr.text", \
+ ".ltext", ".ltext.*"
#define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
".fixup", ".entry.text", ".exception.text", \
".coldtext", ".softirqentry.text"
