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| author | Kees Cook <keescook@chromium.org> | 2020-08-21 12:42:59 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-09-01 10:03:18 +0200 |
| commit | 0c918e753f8c03b0308a635c0721a8c24d738d4a (patch) | |
| tree | 640d34b4abcd9cb18c34ce4b3d25462d1ef7a5a2 | |
| parent | 512dd2eebe5585893412e0c8bec8dbfe2dead6c8 (diff) | |
| download | linux-0c918e753f8c03b0308a635c0721a8c24d738d4a.tar.gz linux-0c918e753f8c03b0308a635c0721a8c24d738d4a.tar.bz2 linux-0c918e753f8c03b0308a635c0721a8c24d738d4a.zip | |
arm/build: Assert for unwanted sections
In preparation for warning on orphan sections, enforce
expected-to-be-zero-sized sections (since discarding them might hide
problems with them suddenly gaining unexpected entries).
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Link: https://lore.kernel.org/r/20200821194310.3089815-19-keescook@chromium.org
| -rw-r--r-- | arch/arm/include/asm/vmlinux.lds.h | 11 | ||||
| -rw-r--r-- | arch/arm/kernel/vmlinux-xip.lds.S | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 2 |
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h index 6624dd97475c..4a91428c324d 100644 --- a/arch/arm/include/asm/vmlinux.lds.h +++ b/arch/arm/include/asm/vmlinux.lds.h @@ -52,6 +52,17 @@ ARM_MMU_DISCARD(*(__ex_table)) \ COMMON_DISCARDS +/* + * Sections that should stay zero sized, which is safer to explicitly + * check instead of blindly discarding. + */ +#define ARM_ASSERTS \ + .plt : { \ + *(.iplt) *(.rel.iplt) *(.iplt) *(.igot.plt) \ + } \ + ASSERT(SIZEOF(.plt) == 0, \ + "Unexpected run-time procedure linkages detected!") + #define ARM_DETAILS \ ELF_DETAILS \ .ARM.attributes 0 : { *(.ARM.attributes) } diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S index 11ffa79751da..50136828f5b5 100644 --- a/arch/arm/kernel/vmlinux-xip.lds.S +++ b/arch/arm/kernel/vmlinux-xip.lds.S @@ -152,6 +152,8 @@ SECTIONS STABS_DEBUG DWARF_DEBUG ARM_DETAILS + + ARM_ASSERTS } /* diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index dc672fe35de3..5f4922e858d0 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -151,6 +151,8 @@ SECTIONS STABS_DEBUG DWARF_DEBUG ARM_DETAILS + + ARM_ASSERTS } #ifdef CONFIG_STRICT_KERNEL_RWX |