diff options
| -rw-r--r-- | include/asm-ppc64/elf.h | 8 | ||||
| -rw-r--r-- | include/asm-ppc64/page.h | 15 |
2 files changed, 18 insertions, 5 deletions
diff --git a/include/asm-ppc64/elf.h b/include/asm-ppc64/elf.h index 8457d90244f..6c42d61bedd 100644 --- a/include/asm-ppc64/elf.h +++ b/include/asm-ppc64/elf.h @@ -229,9 +229,13 @@ do { \ /* * An executable for which elf_read_implies_exec() returns TRUE will - * have the READ_IMPLIES_EXEC personality flag set automatically. + * have the READ_IMPLIES_EXEC personality flag set automatically. This + * is only required to work around bugs in old 32bit toolchains. Since + * the 64bit ABI has never had these issues dont enable the workaround + * even if we have an executable stack. */ -#define elf_read_implies_exec(ex, exec_stk) (exec_stk != EXSTACK_DISABLE_X) +#define elf_read_implies_exec(ex, exec_stk) (test_thread_flag(TIF_32BIT) ? \ + (exec_stk != EXSTACK_DISABLE_X) : 0) #endif diff --git a/include/asm-ppc64/page.h b/include/asm-ppc64/page.h index 20e0f19324e..86219574c1a 100644 --- a/include/asm-ppc64/page.h +++ b/include/asm-ppc64/page.h @@ -252,10 +252,19 @@ extern u64 ppc64_pft_size; /* Log 2 of page table size */ /* * This is the default if a program doesn't have a PT_GNU_STACK - * program header entry. + * program header entry. The PPC64 ELF ABI has a non executable stack + * stack by default, so in the absense of a PT_GNU_STACK program header + * we turn execute permission off. */ -#define VM_STACK_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ - VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) +#define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#define VM_STACK_DEFAULT_FLAGS \ + (test_thread_flag(TIF_32BIT) ? \ + VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64) #endif /* __KERNEL__ */ #endif /* _PPC64_PAGE_H */ |