From: David Howells The attached patch changes setup_arg_pages() to take the proposed initial stack top for the new executable image. This makes it easier for the binfmt to place the stack at a non-fixed location, such as happens in !MMU configurations. Signed-Off-By: David Howells Signed-off-by: Andrew Morton --- 25-akpm/arch/x86_64/ia32/ia32_aout.c | 5 +++-- 25-akpm/arch/x86_64/ia32/ia32_binfmt.c | 7 ++++--- 25-akpm/fs/binfmt_aout.c | 2 +- 25-akpm/fs/binfmt_elf.c | 2 +- 25-akpm/fs/binfmt_som.c | 2 +- 25-akpm/fs/exec.c | 12 +++++++----- 25-akpm/include/linux/binfmts.h | 4 +++- 7 files changed, 20 insertions(+), 14 deletions(-) diff -puN arch/x86_64/ia32/ia32_aout.c~frv-change-setup_arg_pages-to-take-stack-pointer arch/x86_64/ia32/ia32_aout.c --- 25/arch/x86_64/ia32/ia32_aout.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.978530488 -0800 +++ 25-akpm/arch/x86_64/ia32/ia32_aout.c 2004-11-30 01:22:54.990528664 -0800 @@ -36,7 +36,8 @@ #undef WARN_OLD #undef CORE_DUMP /* probably broken */ -extern int ia32_setup_arg_pages(struct linux_binprm *bprm, int exec_stack); +extern int ia32_setup_arg_pages(struct linux_binprm *bprm, + unsigned long stack_top, int exec_stack); static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs); static int load_aout_library(struct file*); @@ -397,7 +398,7 @@ beyond_if: set_brk(current->mm->start_brk, current->mm->brk); - retval = ia32_setup_arg_pages(bprm, EXSTACK_DEFAULT); + retval = ia32_setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT); if (retval < 0) { /* Someone check-me: is this error path enough? */ send_sig(SIGKILL, current, 0); diff -puN arch/x86_64/ia32/ia32_binfmt.c~frv-change-setup_arg_pages-to-take-stack-pointer arch/x86_64/ia32/ia32_binfmt.c --- 25/arch/x86_64/ia32/ia32_binfmt.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.980530184 -0800 +++ 25-akpm/arch/x86_64/ia32/ia32_binfmt.c 2004-11-30 01:22:54.991528512 -0800 @@ -273,8 +273,9 @@ do { \ #define load_elf_binary load_elf32_binary #define ELF_PLAT_INIT(r, load_addr) elf32_init(r) -#define setup_arg_pages(bprm, exec_stack) ia32_setup_arg_pages(bprm, exec_stack) -int ia32_setup_arg_pages(struct linux_binprm *bprm, int executable_stack); +#define setup_arg_pages(bprm, stack_top, exec_stack) \ + ia32_setup_arg_pages(bprm, stack_top, exec_stack) +int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack); #undef start_thread #define start_thread(regs,new_rip,new_rsp) do { \ @@ -329,7 +330,7 @@ static void elf32_init(struct pt_regs *r me->thread.es = __USER_DS; } -int setup_arg_pages(struct linux_binprm *bprm, int executable_stack) +int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack) { unsigned long stack_base; struct vm_area_struct *mpnt; diff -puN fs/binfmt_aout.c~frv-change-setup_arg_pages-to-take-stack-pointer fs/binfmt_aout.c --- 25/fs/binfmt_aout.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.981530032 -0800 +++ 25-akpm/fs/binfmt_aout.c 2004-11-30 01:22:54.992528360 -0800 @@ -424,7 +424,7 @@ beyond_if: return retval; } - retval = setup_arg_pages(bprm, EXSTACK_DEFAULT); + retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); if (retval < 0) { /* Someone check-me: is this error path enough? */ send_sig(SIGKILL, current, 0); diff -puN fs/binfmt_elf.c~frv-change-setup_arg_pages-to-take-stack-pointer fs/binfmt_elf.c --- 25/fs/binfmt_elf.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.983529728 -0800 +++ 25-akpm/fs/binfmt_elf.c 2004-11-30 01:22:54.993528208 -0800 @@ -736,7 +736,7 @@ static int load_elf_binary(struct linux_ change some of these later */ current->mm->rss = 0; current->mm->free_area_cache = current->mm->mmap_base; - retval = setup_arg_pages(bprm, executable_stack); + retval = setup_arg_pages(bprm, STACK_TOP, executable_stack); if (retval < 0) { send_sig(SIGKILL, current, 0); goto out_free_dentry; diff -puN fs/binfmt_som.c~frv-change-setup_arg_pages-to-take-stack-pointer fs/binfmt_som.c --- 25/fs/binfmt_som.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.984529576 -0800 +++ 25-akpm/fs/binfmt_som.c 2004-11-30 01:22:54.993528208 -0800 @@ -254,7 +254,7 @@ load_som_binary(struct linux_binprm * bp set_binfmt(&som_format); compute_creds(bprm); - setup_arg_pages(bprm, EXSTACK_DEFAULT); + setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); create_som_tables(bprm); diff -puN fs/exec.c~frv-change-setup_arg_pages-to-take-stack-pointer fs/exec.c --- 25/fs/exec.c~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.986529272 -0800 +++ 25-akpm/fs/exec.c 2004-11-30 01:22:54.995527904 -0800 @@ -342,7 +342,9 @@ out_sig: #define EXTRA_STACK_VM_PAGES 20 /* random */ -int setup_arg_pages(struct linux_binprm *bprm, int executable_stack) +int setup_arg_pages(struct linux_binprm *bprm, + unsigned long stack_top, + int executable_stack) { unsigned long stack_base; struct vm_area_struct *mpnt; @@ -383,7 +385,7 @@ int setup_arg_pages(struct linux_binprm stack_base = current->signal->rlim[RLIMIT_STACK].rlim_max; if (stack_base > (1 << 30)) stack_base = 1 << 30; - stack_base = PAGE_ALIGN(STACK_TOP - stack_base); + stack_base = PAGE_ALIGN(stack_top - stack_base); /* Adjust bprm->p to point to the end of the strings. */ bprm->p = stack_base + PAGE_SIZE * i - offset; @@ -395,10 +397,10 @@ int setup_arg_pages(struct linux_binprm while (i < MAX_ARG_PAGES) bprm->page[i++] = NULL; #else - stack_base = STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE; + stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE; bprm->p += stack_base; mm->arg_start = bprm->p; - arg_size = STACK_TOP - (PAGE_MASK & (unsigned long) mm->arg_start); + arg_size = stack_top - (PAGE_MASK & (unsigned long) mm->arg_start); #endif arg_size += EXTRA_STACK_VM_PAGES * PAGE_SIZE; @@ -425,7 +427,7 @@ int setup_arg_pages(struct linux_binprm mpnt->vm_start = stack_base; mpnt->vm_end = stack_base + arg_size; #else - mpnt->vm_end = STACK_TOP; + mpnt->vm_end = stack_top; mpnt->vm_start = mpnt->vm_end - arg_size; #endif /* Adjust stack execute permissions; explicitly enable diff -puN include/linux/binfmts.h~frv-change-setup_arg_pages-to-take-stack-pointer include/linux/binfmts.h --- 25/include/linux/binfmts.h~frv-change-setup_arg_pages-to-take-stack-pointer 2004-11-30 01:22:54.987529120 -0800 +++ 25-akpm/include/linux/binfmts.h 2004-11-30 01:22:54.995527904 -0800 @@ -74,7 +74,9 @@ extern int flush_old_exec(struct linux_b #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ -extern int setup_arg_pages(struct linux_binprm * bprm, int executable_stack); +extern int setup_arg_pages(struct linux_binprm * bprm, + unsigned long stack_top, + int executable_stack); extern int copy_strings(int argc,char __user * __user * argv,struct linux_binprm *bprm); extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); extern void compute_creds(struct linux_binprm *binprm); _