From ec30e84671aac9a2e9549754eb7bc6201728db4c Mon Sep 17 00:00:00 2001 From: Jerome Forissier Date: Tue, 23 Aug 2022 12:31:46 +0000 Subject: [PATCH] arm32: libutils, libutee, ta: add .note.GNU-stack section to .S files When building for arm32 with GNU binutils 2.39, the linker outputs warnings when linking Trusted Applications: arm-unknown-linux-uclibcgnueabihf-ld.bfd: warning: utee_syscalls_a32.o: missing .note.GNU-stack section implies executable stack arm-unknown-linux-uclibcgnueabihf-ld.bfd: NOTE: This behaviour is deprecated and will be removed in a future version of the linker We could silence the warning by adding the '-z execstack' option to the TA link flags, like we did in the parent commit for the TEE core and ldelf. Indeed, ldelf always allocates a non-executable piece of memory for the TA to use as a stack. However it seems preferable to comply with the common ELF practices in this case. A better fix is therefore to add the missing .note.GNU-stack sections in the assembler files. Signed-off-by: Jerome Forissier Signed-off-by: Anton Antonov Upstream-Status: Backport [https://github.com/OP-TEE/optee_os/pull/5499] --- lib/libutee/arch/arm/utee_syscalls_a32.S | 2 ++ lib/libutils/ext/arch/arm/atomic_a32.S | 2 ++ lib/libutils/ext/arch/arm/mcount_a32.S | 2 ++ lib/libutils/isoc/arch/arm/arm32_aeabi_divmod_a32.S | 2 ++ lib/libutils/isoc/arch/arm/arm32_aeabi_ldivmod_a32.S | 2 ++ lib/libutils/isoc/arch/arm/setjmp_a32.S | 2 ++ ta/arch/arm/ta_entry_a32.S | 2 ++ 7 files changed, 14 insertions(+) --- a/lib/libutee/arch/arm/utee_syscalls_a32.S +++ b/lib/libutee/arch/arm/utee_syscalls_a32.S @@ -9,6 +9,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + .section .text .balign 4 .code 32 --- a/lib/libutils/ext/arch/arm/atomic_a32.S +++ b/lib/libutils/ext/arch/arm/atomic_a32.S @@ -7,6 +7,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* uint32_t atomic_inc32(uint32_t *v); */ FUNC atomic_inc32 , : ldrex r1, [r0] --- a/lib/libutils/ext/arch/arm/mcount_a32.S +++ b/lib/libutils/ext/arch/arm/mcount_a32.S @@ -9,6 +9,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* * Convert return address to call site address by subtracting the size of the * mcount call instruction (blx __gnu_mcount_nc). --- a/lib/libutils/isoc/arch/arm/arm32_aeabi_divmod_a32.S +++ b/lib/libutils/isoc/arch/arm/arm32_aeabi_divmod_a32.S @@ -7,6 +7,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* * signed ret_idivmod_values(signed quot, signed rem); * return quotient and remaining the EABI way (regs r0,r1) --- a/lib/libutils/isoc/arch/arm/arm32_aeabi_ldivmod_a32.S +++ b/lib/libutils/isoc/arch/arm/arm32_aeabi_ldivmod_a32.S @@ -7,6 +7,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* * __value_in_regs lldiv_t __aeabi_ldivmod( long long n, long long d) */ --- a/lib/libutils/isoc/arch/arm/setjmp_a32.S +++ b/lib/libutils/isoc/arch/arm/setjmp_a32.S @@ -53,6 +53,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* Arm/Thumb interworking support: The interworking scheme expects functions to use a BX instruction --- a/ta/arch/arm/ta_entry_a32.S +++ b/ta/arch/arm/ta_entry_a32.S @@ -7,6 +7,8 @@ .section .note.GNU-stack,"",%progbits + .section .note.GNU-stack,"",%progbits + /* * This function is the bottom of the user call stack. Mark it as such so that * the unwinding code won't try to go further down.