Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d20894a23708c2af75966534f8e4dedb46d48db2
Commit:     d20894a23708c2af75966534f8e4dedb46d48db2
Parent:     48d13e483c5b450be451f78cc9cb43c0bdd6b7bb
Author:     Andi Kleen <[EMAIL PROTECTED]>
AuthorDate: Fri Feb 8 04:21:54 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 09:22:41 2008 -0800

    Remove a.out interpreter support in ELF loader
    
    Following the deprecation schedule the a.out ELF interpreter support
    is removed now with this patch. a.out ELF interpreters were an transition
    feature for moving a.out systems to ELF, but they're unlikely to be still
    needed. Pure a.out systems will still work of course. This allows to
    simplify the hairy ELF loader.
    
    Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
    Cc: David Howells <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 Documentation/feature-removal-schedule.txt |   11 --
 fs/binfmt_elf.c                            |  173 ++++------------------------
 2 files changed, 21 insertions(+), 163 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt 
b/Documentation/feature-removal-schedule.txt
index 2ad5c98..ce9503c 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -99,17 +99,6 @@ Who: Eric Biederman <[EMAIL PROTECTED]>
 
 ---------------------------
 
-What:  a.out interpreter support for ELF executables
-When:  2.6.25
-Files: fs/binfmt_elf.c
-Why:   Using a.out interpreters for ELF executables was a feature for
-       transition from a.out to ELF. But now it is unlikely to be still
-       needed anymore and removing it would simplify the hairy ELF
-       loader code.
-Who:   Andi Kleen <[EMAIL PROTECTED]>
-
----------------------------
-
 What:  remove EXPORT_SYMBOL(kernel_thread)
 When:  August 2006
 Files: arch/*/kernel/*_ksyms.c
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index a93b117..41a958a 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -134,8 +134,7 @@ static int padzero(unsigned long elf_bss)
 
 static int
 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
-               int interp_aout, unsigned long load_addr,
-               unsigned long interp_load_addr)
+               unsigned long load_addr, unsigned long interp_load_addr)
 {
        unsigned long p = bprm->p;
        int argc = bprm->argc;
@@ -223,12 +222,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr 
*exec,
 
        sp = STACK_ADD(p, ei_index);
 
-       items = (argc + 1) + (envc + 1);
-       if (interp_aout) {
-               items += 3; /* a.out interpreters require argv & envp too */
-       } else {
-               items += 1; /* ELF interpreters only put argc on the stack */
-       }
+       items = (argc + 1) + (envc + 1) + 1;
        bprm->p = STACK_ROUND(sp, items);
 
        /* Point sp at the lowest address on the stack */
@@ -251,16 +245,8 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr 
*exec,
        /* Now, let's put argc (and argv, envp if appropriate) on the stack */
        if (__put_user(argc, sp++))
                return -EFAULT;
-       if (interp_aout) {
-               argv = sp + 2;
-               envp = argv + argc + 1;
-               if (__put_user((elf_addr_t)(unsigned long)argv, sp++) ||
-                   __put_user((elf_addr_t)(unsigned long)envp, sp++))
-                       return -EFAULT;
-       } else {
-               argv = sp;
-               envp = argv + argc + 1;
-       }
+       argv = sp;
+       envp = argv + argc + 1;
 
        /* Populate argv and envp */
        p = current->mm->arg_end = current->mm->arg_start;
@@ -513,61 +499,6 @@ out:
        return error;
 }
 
-#ifdef CONFIG_ARCH_SUPPORTS_AOUT
-static unsigned long load_aout_interp(struct exec *interp_ex,
-               struct file *interpreter)
-{
-       unsigned long text_data, elf_entry = ~0UL;
-       char __user * addr;
-       loff_t offset;
-
-       current->mm->end_code = interp_ex->a_text;
-       text_data = interp_ex->a_text + interp_ex->a_data;
-       current->mm->end_data = text_data;
-       current->mm->brk = interp_ex->a_bss + text_data;
-
-       switch (N_MAGIC(*interp_ex)) {
-       case OMAGIC:
-               offset = 32;
-               addr = (char __user *)0;
-               break;
-       case ZMAGIC:
-       case QMAGIC:
-               offset = N_TXTOFF(*interp_ex);
-               addr = (char __user *)N_TXTADDR(*interp_ex);
-               break;
-       default:
-               goto out;
-       }
-
-       down_write(&current->mm->mmap_sem);     
-       do_brk(0, text_data);
-       up_write(&current->mm->mmap_sem);
-       if (!interpreter->f_op || !interpreter->f_op->read)
-               goto out;
-       if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
-               goto out;
-       flush_icache_range((unsigned long)addr,
-                          (unsigned long)addr + text_data);
-
-       down_write(&current->mm->mmap_sem);     
-       do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
-               interp_ex->a_bss);
-       up_write(&current->mm->mmap_sem);
-       elf_entry = interp_ex->a_entry;
-
-out:
-       return elf_entry;
-}
-#else
-/* dummy extern - the function should never be called if !CONFIG_AOUT_BINFMT */
-static inline unsigned long load_aout_interp(struct exec *interp_ex,
-                                            struct file *interpreter)
-{
-       return -ELIBACC;
-}
-#endif
-
 /*
  * These are the functions used to load ELF style executables and shared
  * libraries.  There is no binary dependent code anywhere else.
@@ -576,13 +507,6 @@ static inline unsigned long load_aout_interp(struct exec 
*interp_ex,
 #define INTERPRETER_NONE 0
 #define INTERPRETER_ELF 2
 
-#ifdef CONFIG_ARCH_SUPPORTS_AOUT
-#define INTERPRETER_AOUT 1
-#define IS_AOUT_INTERP(x) ((x) == INTERPRETER_AOUT)
-#else
-#define IS_AOUT_INTERP(x) (0)
-#endif
-
 #ifndef STACK_RND_MASK
 #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))    /* 8MB of VA */
 #endif
@@ -609,7 +533,6 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        unsigned long load_addr = 0, load_bias = 0;
        int load_addr_set = 0;
        char * elf_interpreter = NULL;
-       unsigned int interpreter_type = INTERPRETER_NONE;
        unsigned long error;
        struct elf_phdr *elf_ppnt, *elf_phdata;
        unsigned long elf_bss, elf_brk;
@@ -620,7 +543,6 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        unsigned long interp_load_addr = 0;
        unsigned long start_code, end_code, start_data, end_data;
        unsigned long reloc_func_desc = 0;
-       char passed_fileno[6];
        struct files_struct *files;
        int executable_stack = EXSTACK_DEFAULT;
        unsigned long def_flags = 0;
@@ -789,62 +711,18 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
 
        /* Some simple consistency checks for the interpreter */
        if (elf_interpreter) {
-               static int warn;
-#ifdef CONFIG_ARCH_SUPPORTS_AOUT
-               interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
-
-               /* Now figure out which format our binary is */
-               if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
-                   (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
-                   (N_MAGIC(loc->interp_ex) != QMAGIC))
-                       interpreter_type = INTERPRETER_ELF;
-#else
-               interpreter_type = INTERPRETER_ELF;
-#endif
-               if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
-                       interpreter_type &= ~INTERPRETER_ELF;
-
-               if (IS_AOUT_INTERP(interpreter_type) && warn < 10) {
-                       printk(KERN_WARNING "a.out ELF interpreter %s is "
-                               "deprecated and will not be supported "
-                               "after Linux 2.6.25\n", elf_interpreter);
-                       warn++;
-               }
-
                retval = -ELIBBAD;
-               if (!interpreter_type)
+               /* Not an ELF interpreter */
+               if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
                        goto out_free_dentry;
-
-               /* Make sure only one type was selected */
-               if ((interpreter_type & INTERPRETER_ELF) &&
-                    interpreter_type != INTERPRETER_ELF) {
-                       // FIXME - ratelimit this before re-enabling
-                       // printk(KERN_WARNING "ELF: Ambiguous type, using 
ELF\n");
-                       interpreter_type = INTERPRETER_ELF;
-               }
                /* Verify the interpreter has a valid arch */
-               if ((interpreter_type == INTERPRETER_ELF) &&
-                   !elf_check_arch(&loc->interp_elf_ex))
+               if (!elf_check_arch(&loc->interp_elf_ex))
                        goto out_free_dentry;
        } else {
                /* Executables without an interpreter also need a personality  
*/
                SET_PERSONALITY(loc->elf_ex, 0);
        }
 
-       /* OK, we are done with that, now set up the arg stuff,
-          and then start this sucker up */
-       if (IS_AOUT_INTERP(interpreter_type) && !bprm->sh_bang) {
-               char *passed_p = passed_fileno;
-               sprintf(passed_fileno, "%d", elf_exec_fileno);
-
-               if (elf_interpreter) {
-                       retval = copy_strings_kernel(1, &passed_p, bprm);
-                       if (retval)
-                               goto out_free_dentry; 
-                       bprm->argc++;
-               }
-       }
-
        /* Flush all traces of the currently running executable */
        retval = flush_old_exec(bprm);
        if (retval)
@@ -1022,24 +900,19 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        }
 
        if (elf_interpreter) {
-               if (IS_AOUT_INTERP(interpreter_type)) {
-                       elf_entry = load_aout_interp(&loc->interp_ex,
-                                                    interpreter);
-               } else {
-                       unsigned long uninitialized_var(interp_map_addr);
-
-                       elf_entry = load_elf_interp(&loc->interp_elf_ex,
-                                                   interpreter,
-                                                   &interp_map_addr,
-                                                   load_bias);
-                       if (!IS_ERR((void *)elf_entry)) {
-                               /*
-                                * load_elf_interp() returns relocation
-                                * adjustment
-                                */
-                               interp_load_addr = elf_entry;
-                               elf_entry += loc->interp_elf_ex.e_entry;
-                       }
+               unsigned long uninitialized_var(interp_map_addr);
+
+               elf_entry = load_elf_interp(&loc->interp_elf_ex,
+                                           interpreter,
+                                           &interp_map_addr,
+                                           load_bias);
+               if (!IS_ERR((void *)elf_entry)) {
+                       /*
+                        * load_elf_interp() returns relocation
+                        * adjustment
+                        */
+                       interp_load_addr = elf_entry;
+                       elf_entry += loc->interp_elf_ex.e_entry;
                }
                if (BAD_ADDR(elf_entry)) {
                        force_sig(SIGSEGV, current);
@@ -1063,8 +936,7 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
 
        kfree(elf_phdata);
 
-       if (!IS_AOUT_INTERP(interpreter_type))
-               sys_close(elf_exec_fileno);
+       sys_close(elf_exec_fileno);
 
        set_binfmt(&elf_format);
 
@@ -1079,15 +951,12 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        compute_creds(bprm);
        current->flags &= ~PF_FORKNOEXEC;
        retval = create_elf_tables(bprm, &loc->elf_ex,
-                         IS_AOUT_INTERP(interpreter_type),
                          load_addr, interp_load_addr);
        if (retval < 0) {
                send_sig(SIGKILL, current, 0);
                goto out;
        }
        /* N.B. passed_fileno might not be initialized? */
-       if (IS_AOUT_INTERP(interpreter_type))
-               current->mm->arg_start += strlen(passed_fileno) + 1;
        current->mm->end_code = end_code;
        current->mm->start_code = start_code;
        current->mm->start_data = start_data;
-
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