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Sat, 23 May 2026 00:14:58 -0700 (PDT) Received: from [192.168.0.174] ([31.96.183.250]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-45eb6d5cb76sm8639838f8f.25.2026.05.23.00.14.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2026 00:14:58 -0700 (PDT) From: Jim Cromie Date: Sat, 23 May 2026 01:14:38 -0600 Subject: [PATCH v2 05/24] vmlinux.lds.h: Fix ALIGN(8) omission causing NULL ptr on i386 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260523-dd-maint-2-v2-5-b937312aa083@gmail.com> References: <20260523-dd-maint-2-v2-0-b937312aa083@gmail.com> In-Reply-To: <20260523-dd-maint-2-v2-0-b937312aa083@gmail.com> To: Jonathan Corbet , Shuah Khan , Arnd Bergmann , Jason Baron , Luis Chamberlain , Petr Pavlu , Daniel Gomez , Sami Tolvanen , Aaron Tomlin , Andrew Morton , Shuah Khan Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-kselftest@vger.kernel.org, Jim Cromie , Louis Chauvet X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779520485; l=5646; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=+PxUnhBt80sstYpQetbEqjhIty9CFiNlWXfpNo966yQ=; b=LC+g3SA21No6OnlSoBIeD8nbOvdfbK53Yfv1CyUMhk171BK4tL0+Ei5yTuw4ygNutkSE3nxf1 hnW3IqZv/xOA4i5ezOYhthXck6luafM78K/AYe49plfHWFl63MzFvLo X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= Almost all uses of the BOUNDED_SECTION macros are ALIGN(8), either explicitly, or by being below an aligned section containing x*8 byte objects. The noteworthy exception is BOUNDED_SECTION(__dyndbg), which immediately follows BOUNDED_SECTION(__dyndbg_classes). On i386, struct _ddebug_classmap is 28 bytes, so without an explicit ALIGN(8) in the macro, the following __dyndbg section gets misaligned, causing a NULL ptr deref in dynamic_debug_init(). So fix this with an explicit ALIGN(8) in the existing BOUNDED_SECTION macros, and introduce _ALIGNED variants to handle the cases with an explicit . = ALIGN(x) Also add explicit alignments for: EXCEPTION_TABLE, ORC_UNWIND_TABLE, TRACEDATA, and INIT_SETUP. update BOUNDED_SECTION uses inside . = ALIGN(x) stanzas to use _ALIGNED variants, but keep the outer ALIGNs so the symbols between them are not "re-aligned". In particular, scripts/sorttable.c does not tolerate sloppy padding. At the top of ORC_UNWIND_TABLE, add . = ALIGN(4) to match the struct orc_header __align() call in the code: commit b9f174c811e3 ("x86/unwind/orc: Add ELF section with ORC version identifier") Suggested-by: Louis Chauvet # _ALIGNED variants. Link: https://lore.kernel.org/lkml/177402491426.6181.12855763650074831089.b4-review@b4/ Signed-off-by: Jim Cromie --- v3: sashiko picked up 2 cases, added to the explicit list above https://sashiko.dev/#/patchset/20260515-asm-generic-1-v3-0-680b273666d4%40gmail.com --- include/asm-generic/bounded_sections.lds.h | 17 ++++++++++++++--- include/asm-generic/vmlinux.lds.h | 15 ++++++++------- 2 files changed, 22 insertions(+), 10 deletions(-) diff --git a/include/asm-generic/bounded_sections.lds.h b/include/asm-generic/bounded_sections.lds.h index 268cdc34389b..8ff3e3420f60 100644 --- a/include/asm-generic/bounded_sections.lds.h +++ b/include/asm-generic/bounded_sections.lds.h @@ -3,19 +3,30 @@ #ifndef _ASM_GENERIC_BOUNDED_SECTIONS_H #define _ASM_GENERIC_BOUNDED_SECTIONS_H -#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ +#define BOUNDED_SECTION_PRE_LABEL_ALIGNED(_sec_, _label_, _BEGIN_, _END_, _ALIGNED_) \ + . = ALIGN(_ALIGNED_); \ _BEGIN_##_label_ = .; \ KEEP(*(_sec_)) \ _END_##_label_ = .; -#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ +#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ + BOUNDED_SECTION_PRE_LABEL_ALIGNED(_sec_, _label_, _BEGIN_, _END_, 8) + +#define BOUNDED_SECTION_POST_LABEL_ALIGNED(_sec_, _label_, _BEGIN_, _END_, _ALIGNED_) \ + . = ALIGN(_ALIGNED_); \ _label_##_BEGIN_ = .; \ KEEP(*(_sec_)) \ _label_##_END_ = .; +#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ + BOUNDED_SECTION_POST_LABEL_ALIGNED(_sec_, _label_, _BEGIN_, _END_, 8) + #define BOUNDED_SECTION_BY(_sec_, _label_) \ BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) -#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) +#define BOUNDED_SECTION_BY_ALIGNED(_sec_, _label_, _ALIGNED_) \ + BOUNDED_SECTION_PRE_LABEL_ALIGNED(_sec_, _label_, __start, __stop, _ALIGNED_) + +#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) #endif /* _ASM_GENERIC_BOUNDED_SECTIONS_H */ diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 9c61dd083f26..477333bdf3d3 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -640,7 +640,7 @@ #define EXCEPTION_TABLE(align) \ . = ALIGN(align); \ __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ - BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ + BOUNDED_SECTION_BY_ALIGNED(__ex_table, ___ex_table, align) \ } /* @@ -650,7 +650,7 @@ #define BTF \ . = ALIGN(PAGE_SIZE); \ .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ - BOUNDED_SECTION_BY(.BTF, _BTF) \ + BOUNDED_SECTION_BY_ALIGNED(.BTF, _BTF, PAGE_SIZE) \ } \ . = ALIGN(PAGE_SIZE); \ .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ @@ -832,16 +832,17 @@ #ifdef CONFIG_UNWINDER_ORC #define ORC_UNWIND_TABLE \ + . = ALIGN(4); \ .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ - BOUNDED_SECTION_BY(.orc_header, _orc_header) \ + BOUNDED_SECTION_BY_ALIGNED(.orc_header, _orc_header, 4) \ } \ . = ALIGN(4); \ .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ - BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ + BOUNDED_SECTION_BY_ALIGNED(.orc_unwind_ip, _orc_unwind_ip, 4)\ } \ . = ALIGN(2); \ .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ - BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ + BOUNDED_SECTION_BY_ALIGNED(.orc_unwind, _orc_unwind, 2) \ } \ text_size = _etext - _stext; \ . = ALIGN(4); \ @@ -869,7 +870,7 @@ #define TRACEDATA \ . = ALIGN(4); \ .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ - BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ + BOUNDED_SECTION_POST_LABEL_ALIGNED(.tracedata, __tracedata, _start, _end, 4) \ } #else #define TRACEDATA @@ -904,7 +905,7 @@ #define INIT_SETUP(initsetup_align) \ . = ALIGN(initsetup_align); \ - BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) + BOUNDED_SECTION_POST_LABEL_ALIGNED(.init.setup, __setup, _start, _end, initsetup_align) #define INIT_CALLS_LEVEL(level) \ __initcall##level##_start = .; \ -- 2.54.0