Make PIE kernel
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d68a24f849
commit
40a2a7c915
3 changed files with 22 additions and 11 deletions
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@ -50,8 +50,7 @@ override CFLAGS += \
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-fno-stack-protector \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-stack-check \
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-fno-lto \
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-fno-lto \
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-fno-PIE \
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-fPIE \
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-fno-PIC \
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-m64 \
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-m64 \
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-march=x86-64 \
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-march=x86-64 \
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-mabi=sysv \
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-mabi=sysv \
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@ -59,8 +58,7 @@ override CFLAGS += \
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-mno-mmx \
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-mno-mmx \
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-mno-sse \
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-mno-sse \
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-mno-sse2 \
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-mno-sse2 \
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-mno-red-zone \
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-mno-red-zone
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-mcmodel=kernel
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# Internal C preprocessor flags that should not be changed by the user.
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# Internal C preprocessor flags that should not be changed by the user.
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override CPPFLAGS := \
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override CPPFLAGS := \
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@ -71,17 +69,15 @@ override CPPFLAGS := \
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# Internal linker flags that should not be changed by the user.
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# Internal linker flags that should not be changed by the user.
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override LDFLAGS += \
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override LDFLAGS += \
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-m elf_x86_64 \
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-nostdlib \
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-nostdlib \
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-static \
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-static \
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-m elf_x86_64 \
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-pie \
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--no-dynamic-linker \
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-z text \
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-z max-page-size=0x1000 \
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-z max-page-size=0x1000 \
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-T linker.ld
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-T linker.ld
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# Check if the linker supports -no-pie and enable it if it does.
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ifeq ($(shell $(LD) --help 2>&1 | grep 'no-pie' >/dev/null 2>&1; echo $$?),0)
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override LDFLAGS += -no-pie
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endif
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# Internal nasm flags that should not be changed by the user.
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# Internal nasm flags that should not be changed by the user.
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override NASMFLAGS += \
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override NASMFLAGS += \
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-Wall \
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-Wall \
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@ -12,6 +12,7 @@ PHDRS
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text PT_LOAD FLAGS((1 << 0) | (1 << 2)) ; /* Execute + Read */
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text PT_LOAD FLAGS((1 << 0) | (1 << 2)) ; /* Execute + Read */
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rodata PT_LOAD FLAGS((1 << 2)) ; /* Read only */
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rodata PT_LOAD FLAGS((1 << 2)) ; /* Read only */
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data PT_LOAD FLAGS((1 << 1) | (1 << 2)) ; /* Write + Read */
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data PT_LOAD FLAGS((1 << 1) | (1 << 2)) ; /* Write + Read */
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dynamic PT_DYNAMIC FLAGS((1 << 1) | (1 << 2)) ; /* Dynamic PHDR for relocations */
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}
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}
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SECTIONS
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SECTIONS
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@ -40,6 +41,11 @@ SECTIONS
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*(.data .data.*)
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*(.data .data.*)
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} :data
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} :data
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/* Dynamic section for relocations, both in its own PHDR and inside data PHDR */
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.dynamic : {
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*(.dynamic)
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} :data :dynamic
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/* NOTE: .bss needs to be the last thing mapped to :data, otherwise lots of */
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/* NOTE: .bss needs to be the last thing mapped to :data, otherwise lots of */
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/* unnecessary zeros will be written to the binary. */
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/* unnecessary zeros will be written to the binary. */
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/* If you need, for example, .init_array and .fini_array, those should be placed */
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/* If you need, for example, .init_array and .fini_array, those should be placed */
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11
limine.cfg
11
limine.cfg
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@ -2,9 +2,18 @@
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TIMEOUT=3
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TIMEOUT=3
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# The entry name that will be displayed in the boot menu.
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# The entry name that will be displayed in the boot menu.
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:Limine Barebones
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:Limine Barebones (KASLR off)
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# We use the Limine boot protocol.
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# We use the Limine boot protocol.
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PROTOCOL=limine
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PROTOCOL=limine
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# Disable KASLR (it is enabled by default for relocatable kernels)
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KASLR=no
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# Path to the kernel to boot. boot:/// represents the partition on which limine.cfg is located.
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# Path to the kernel to boot. boot:/// represents the partition on which limine.cfg is located.
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KERNEL_PATH=boot:///kernel.elf
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KERNEL_PATH=boot:///kernel.elf
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# Same thing, but with KASLR.
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:Limine Barebones (KASLR on)
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PROTOCOL=limine
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KERNEL_PATH=boot:///kernel.elf
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