Commit fc9bea0e authored Mar 24, 2015 by Andrey Ryabinin Committed by Richard Weinberger Apr 13, 2015

x86, UML: fix integer overflow in ELF_ET_DYN_BASE



Almost all arches define ELF_ET_DYN_BASE as 2/3 of TASK_SIZE.
Though it seems that some architectures do this in a wrong way.
The problem is that 2*TASK_SIZE may overflow 32-bits so
the real ELF_ET_DYN_BASE becomes wrong.
Fix this overflow by dividing TASK_SIZE prior to multiplying:
	(TASK_SIZE / 3 * 2)

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

parent 0c9bd636

arch/x86/um/asm/elf.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -210,7 +210,7 @@ extern int elf_core_copy_fpregs(struct task_struct t, elf_fpregset_t fpu);

		#define ELF_EXEC_PAGESIZE 4096

		#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
		#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)

		extern long elf_aux_hwcap;
		#define ELF_HWCAP (elf_aux_hwcap)