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Users of GNU ld (BFD) from binutils 2.39+ will observe multiple instances of a new warning when linking kernels in the form: ld: warning: arch/x86/boot/pmjump.o: missing .note.GNU-stack section implies executable stack ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker ld: warning: arch/x86/boot/compressed/vmlinux has a LOAD segment with RWX permissions Generally, we would like to avoid the stack being executable. Because there could be a need for the stack to be executable, assembler sources have to opt-in to this security feature via explicit creation of the .note.GNU-stack feature (which compilers create by default) or command line flag --noexecstack. Or we can simply tell the linker the production of such sections is irrelevant and to link the stack as --noexecstack. LLVM's LLD linker defaults to -z noexecstack, so this flag isn't strictly necessary when linking with LLD, only BFD, but it doesn't hurt to be explicit here for all linkers IMO. --no-warn-rwx-segments is currently BFD specific and only available in the current latest release, so it's wrapped in an ld-option check. While the kernel makes extensive usage of ELF sections, it doesn't use permissions from ELF segments. Link: https://lore.kernel.org/linux-block/3af4127a-f453-4cf7-f133-a181cce06f73@kernel.dk/ Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107 Link: https://github.com/llvm/llvm-project/issues/57009 Reported-and-tested-by: Jens Axboe <axboe@kernel.dk> Suggested-by: Fangrui Song <maskray@google.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
compressed | ||
tools | ||
.gitignore | ||
a20.c | ||
apm.c | ||
bioscall.S | ||
bitops.h | ||
boot.h | ||
cmdline.c | ||
copy.S | ||
cpu.c | ||
cpucheck.c | ||
cpuflags.c | ||
cpuflags.h | ||
ctype.h | ||
early_serial_console.c | ||
edd.c | ||
genimage.sh | ||
header.S | ||
install.sh | ||
io.h | ||
main.c | ||
Makefile | ||
memory.c | ||
mkcpustr.c | ||
msr.h | ||
mtools.conf.in | ||
pm.c | ||
pmjump.S | ||
printf.c | ||
regs.c | ||
setup.ld | ||
string.c | ||
string.h | ||
tty.c | ||
version.c | ||
vesa.h | ||
video-bios.c | ||
video-mode.c | ||
video-vesa.c | ||
video-vga.c | ||
video.c | ||
video.h |