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| author |   Atish Patra <atish.patra@wdc.com> | 2020-11-04 16:04:38 -0800 |
|---|---|---|
| committer |   Palmer Dabbelt <palmerdabbelt@google.com> | 2020-11-25 16:05:28 -0800 |
| commit | 19a00869028f4a28a36f90649166631dff6e3ccd (patch) | |
| tree | ef4a68e11c94a44d7e9de3f6f83fe57877739ba9 /arch/riscv/kernel/vmlinux.lds.S | |
| parent | RISC-V: Align the .init.text section (diff) | |
| download | linux-dev-19a00869028f4a28a36f90649166631dff6e3ccd.tar.xz linux-dev-19a00869028f4a28a36f90649166631dff6e3ccd.zip | |
RISC-V: Protect all kernel sections including init early
Currently, .init.text & .init.data are intermixed which makes it impossible
apply different permissions to them. .init.data shouldn't need exec
permissions while .init.text shouldn't have write permission. Moreover,
the strict permission are only enforced /init starts. This leaves the
kernel vulnerable from possible buggy built-in modules.
Keep .init.text & .data in separate sections so that different permissions
are applied to each section. Apply permissions to individual sections as
early as possible. This improves the kernel protection under
CONFIG_STRICT_KERNEL_RWX. We also need to restore the permissions for the
entire _init section after it is freed so that those pages can be used
for other purpose.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Tested-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/riscv/kernel/vmlinux.lds.S | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S index cacd7898ba7f..ca19ee5acd0a 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -29,6 +29,22 @@ SECTIONS HEAD_TEXT_SECTION . = ALIGN(PAGE_SIZE); + .text : { + _text = .; + _stext = .; + TEXT_TEXT + SCHED_TEXT + CPUIDLE_TEXT + LOCK_TEXT + KPROBES_TEXT + ENTRY_TEXT + IRQENTRY_TEXT + SOFTIRQENTRY_TEXT + *(.fixup) + _etext = .; + } + + . = ALIGN(SECTION_ALIGN); __init_begin = .; __init_text_begin = .; .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) ALIGN(SECTION_ALIGN) { \ @@ -53,35 +69,24 @@ SECTIONS { EXIT_TEXT } - .exit.data : - { - EXIT_DATA - } - PERCPU_SECTION(L1_CACHE_BYTES) - __init_end = .; + __init_text_end = .; . = ALIGN(SECTION_ALIGN); - .text : { - _text = .; - _stext = .; - TEXT_TEXT - SCHED_TEXT - CPUIDLE_TEXT - LOCK_TEXT - KPROBES_TEXT - ENTRY_TEXT - IRQENTRY_TEXT - SOFTIRQENTRY_TEXT - *(.fixup) - _etext = .; - } - #ifdef CONFIG_EFI . = ALIGN(PECOFF_SECTION_ALIGNMENT); __pecoff_text_end = .; #endif - + /* Start of init data section */ + __init_data_begin = .; INIT_DATA_SECTION(16) + .exit.data : + { + EXIT_DATA + } + PERCPU_SECTION(L1_CACHE_BYTES) + + __init_data_end = .; + __init_end = .; /* Start of data section */ _sdata = .; |