Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d4e3cc387ea1b74c3ad2ef2f6f5c05fd6fc314b8
Commit:     d4e3cc387ea1b74c3ad2ef2f6f5c05fd6fc314b8
Parent:     80e27982a66ea8306a704ba8bdf634ed480d4b46
Author:     Andrew Morton <[EMAIL PROTECTED]>
AuthorDate: Sat Jul 21 04:37:32 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sat Jul 21 17:49:14 2007 -0700

    revert "PIE randomization"
    
    There are reports of this causing userspace failures
    (http://lkml.org/lkml/2007/7/20/421).
    
    Revert.
    
    Cc: Jan Kratochvil <[EMAIL PROTECTED]>
    Cc: Jiri Kosina <[EMAIL PROTECTED]>
    Cc: Ingo Molnar <[EMAIL PROTECTED]>
    Cc: Roland McGrath <[EMAIL PROTECTED]>
    Cc: Jakub Jelinek <[EMAIL PROTECTED]>
    Cc: Ulrich Kunitz <[EMAIL PROTECTED]>
    Cc: "H. Peter Anvin" <[EMAIL PROTECTED]>
    Cc: "Bret Towe" <[EMAIL PROTECTED]>
    Cc: "Luck, Tony" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 arch/ia64/ia32/binfmt_elf32.c |    2 +-
 fs/binfmt_elf.c               |  109 +++++++++--------------------------------
 2 files changed, 24 insertions(+), 87 deletions(-)

diff --git a/arch/ia64/ia32/binfmt_elf32.c b/arch/ia64/ia32/binfmt_elf32.c
index e1189ba..1cfab32 100644
--- a/arch/ia64/ia32/binfmt_elf32.c
+++ b/arch/ia64/ia32/binfmt_elf32.c
@@ -226,7 +226,7 @@ elf32_set_personality (void)
 }
 
 static unsigned long
-elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int 
prot, int type, unsigned long unused)
+elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int 
prot, int type)
 {
        unsigned long pgoff = (eppnt->p_vaddr) & ~IA32_PAGE_MASK;
 
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index ba24cb2..4482a06 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -45,7 +45,7 @@
 
 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
 static int load_elf_library(struct file *);
-static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, 
int, int, unsigned long);
+static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, 
int, int);
 
 /*
  * If we don't support core dumping, then supply a NULL so we
@@ -80,7 +80,7 @@ static struct linux_binfmt elf_format = {
                .hasvdso        = 1
 };
 
-#define BAD_ADDR(x) IS_ERR_VALUE(x)
+#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
 
 static int set_brk(unsigned long start, unsigned long end)
 {
@@ -295,70 +295,33 @@ create_elf_tables(struct linux_binprm *bprm, struct 
elfhdr *exec,
 #ifndef elf_map
 
 static unsigned long elf_map(struct file *filep, unsigned long addr,
-               struct elf_phdr *eppnt, int prot, int type,
-               unsigned long total_size)
+               struct elf_phdr *eppnt, int prot, int type)
 {
        unsigned long map_addr;
-       unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
-       unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
-       addr = ELF_PAGESTART(addr);
-       size = ELF_PAGEALIGN(size);
+       unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
 
+       down_write(&current->mm->mmap_sem);
        /* mmap() will return -EINVAL if given a zero size, but a
         * segment with zero filesize is perfectly valid */
-       if (!size)
-               return addr;
-
-       down_write(&current->mm->mmap_sem);
-       /*
-       * total_size is the size of the ELF (interpreter) image.
-       * The _first_ mmap needs to know the full size, otherwise
-       * randomization might put this image into an overlapping
-       * position with the ELF binary image. (since size < total_size)
-       * So we first map the 'big' image - and unmap the remainder at
-       * the end. (which unmap is needed for ELF images with holes.)
-       */
-       if (total_size) {
-               total_size = ELF_PAGEALIGN(total_size);
-               map_addr = do_mmap(filep, addr, total_size, prot, type, off);
-               if (!BAD_ADDR(map_addr))
-                       do_munmap(current->mm, map_addr+size, total_size-size);
-       } else
-               map_addr = do_mmap(filep, addr, size, prot, type, off);
-
+       if (eppnt->p_filesz + pageoffset)
+               map_addr = do_mmap(filep, ELF_PAGESTART(addr),
+                                  eppnt->p_filesz + pageoffset, prot, type,
+                                  eppnt->p_offset - pageoffset);
+       else
+               map_addr = ELF_PAGESTART(addr);
        up_write(&current->mm->mmap_sem);
        return(map_addr);
 }
 
 #endif /* !elf_map */
 
-static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
-{
-       int i, first_idx = -1, last_idx = -1;
-
-       for (i = 0; i < nr; i++) {
-               if (cmds[i].p_type == PT_LOAD) {
-                       last_idx = i;
-                       if (first_idx == -1)
-                               first_idx = i;
-               }
-       }
-       if (first_idx == -1)
-               return 0;
-
-       return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
-                               ELF_PAGESTART(cmds[first_idx].p_vaddr);
-}
-
-
 /* This is much more generalized than the library routine read function,
    so we keep this separate.  Technically the library read function
    is only provided so that we can read a.out libraries that have
    an ELF header */
 
 static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
-               struct file *interpreter, unsigned long *interp_map_addr,
-               unsigned long no_base)
+               struct file *interpreter, unsigned long *interp_load_addr)
 {
        struct elf_phdr *elf_phdata;
        struct elf_phdr *eppnt;
@@ -366,7 +329,6 @@ static unsigned long load_elf_interp(struct elfhdr 
*interp_elf_ex,
        int load_addr_set = 0;
        unsigned long last_bss = 0, elf_bss = 0;
        unsigned long error = ~0UL;
-       unsigned long total_size;
        int retval, i, size;
 
        /* First of all, some simple consistency checks */
@@ -405,12 +367,6 @@ static unsigned long load_elf_interp(struct elfhdr 
*interp_elf_ex,
                goto out_close;
        }
 
-       total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum);
-       if (!total_size) {
-               error = -EINVAL;
-               goto out_close;
-       }
-
        eppnt = elf_phdata;
        for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
                if (eppnt->p_type == PT_LOAD) {
@@ -428,14 +384,9 @@ static unsigned long load_elf_interp(struct elfhdr 
*interp_elf_ex,
                        vaddr = eppnt->p_vaddr;
                        if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
                                elf_type |= MAP_FIXED;
-                       else if (no_base && interp_elf_ex->e_type == ET_DYN)
-                               load_addr = -vaddr;
 
                        map_addr = elf_map(interpreter, load_addr + vaddr,
-                                          eppnt, elf_prot, elf_type, 
total_size);
-                       total_size = 0;
-                       if (!*interp_map_addr)
-                               *interp_map_addr = map_addr;
+                                          eppnt, elf_prot, elf_type);
                        error = map_addr;
                        if (BAD_ADDR(map_addr))
                                goto out_close;
@@ -501,7 +452,8 @@ static unsigned long load_elf_interp(struct elfhdr 
*interp_elf_ex,
                        goto out_close;
        }
 
-       error = load_addr;
+       *interp_load_addr = load_addr;
+       error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
 
 out_close:
        kfree(elf_phdata);
@@ -598,8 +550,7 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        int elf_exec_fileno;
        int retval, i;
        unsigned int size;
-       unsigned long elf_entry;
-       unsigned long interp_load_addr = 0;
+       unsigned long elf_entry, interp_load_addr = 0;
        unsigned long start_code, end_code, start_data, end_data;
        unsigned long reloc_func_desc = 0;
        char passed_fileno[6];
@@ -863,7 +814,9 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        current->mm->start_stack = bprm->p;
 
        /* Now we do a little grungy work by mmaping the ELF image into
-          the correct location in memory. */
+          the correct location in memory.  At this point, we assume that
+          the image should be loaded at fixed address, not at a variable
+          address. */
        for(i = 0, elf_ppnt = elf_phdata;
            i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
                int elf_prot = 0, elf_flags;
@@ -917,15 +870,11 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
                         * default mmap base, as well as whatever program they
                         * might try to exec.  This is because the brk will
                         * follow the loader, and is not movable.  */
-#ifdef CONFIG_X86
-                       load_bias = 0;
-#else
                        load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
-#endif
                }
 
                error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
-                               elf_prot, elf_flags,0);
+                               elf_prot, elf_flags);
                if (BAD_ADDR(error)) {
                        send_sig(SIGKILL, current, 0);
                        retval = IS_ERR((void *)error) ?
@@ -1001,25 +950,13 @@ static int load_elf_binary(struct linux_binprm *bprm, 
struct pt_regs *regs)
        }
 
        if (elf_interpreter) {
-               if (interpreter_type == INTERPRETER_AOUT) {
+               if (interpreter_type == INTERPRETER_AOUT)
                        elf_entry = load_aout_interp(&loc->interp_ex,
                                                     interpreter);
-               } else {
-                       unsigned long uninitialized_var(interp_map_addr);
-
+               else
                        elf_entry = load_elf_interp(&loc->interp_elf_ex,
                                                    interpreter,
-                                                   &interp_map_addr,
-                                                   load_bias);
-                       if (!BAD_ADDR(elf_entry)) {
-                               /*
-                                * load_elf_interp() returns relocation
-                                * adjustment
-                                */
-                               interp_load_addr = elf_entry;
-                               elf_entry += loc->interp_elf_ex.e_entry;
-                       }
-               }
+                                                   &interp_load_addr);
                if (BAD_ADDR(elf_entry)) {
                        force_sig(SIGSEGV, current);
                        retval = IS_ERR((void *)elf_entry) ?
-
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