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| author | Kees Cook <keescook@chromium.org> | 2020-08-21 22:43:05 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-09-01 11:03:18 +0300 |
| commit | 5354e84598f264793265cc99b4be2a2295826c86 (patch) | |
| tree | f2f2db99d32fe5706161949cdc1b567c6546b929 | |
| parent | 815d680771ae09080d2da83dac2647c08cdf99ce (diff) | |
| download | linux-5354e84598f264793265cc99b4be2a2295826c86.tar.xz | |
x86/build: Add asserts for unwanted sections
In preparation for warning on orphan sections, enforce other
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>
Link: https://lore.kernel.org/r/20200821194310.3089815-25-keescook@chromium.org
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 4b1b936a6e7d..45d72447df84 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -427,6 +427,30 @@ SECTIONS SIZEOF(.got.plt) == 0xc, #endif "Unexpected GOT/PLT entries detected!") + + /* + * Sections that should stay zero sized, which is safer to + * explicitly check instead of blindly discarding. + */ + .got : { + *(.got) *(.igot.*) + } + ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!") + + .plt : { + *(.plt) *(.plt.*) *(.iplt) + } + ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") + + .rel.dyn : { + *(.rel.*) *(.rel_*) + } + ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!") + + .rela.dyn : { + *(.rela.*) *(.rela_*) + } + ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") } #ifdef CONFIG_X86_32 |