#define BAD_ADDR(x) (unlikely((unsigned long)(x) >= TASK_SIZE))
-static int set_brk(unsigned long start, unsigned long end, int prot)
-{
- start = ELF_PAGEALIGN(start);
- end = ELF_PAGEALIGN(end);
- if (end > start) {
- /*
- * Map the last of the bss segment.
- * If the header is requesting these pages to be
- * executable, honour that (ppc32 needs this).
- */
- int error = vm_brk_flags(start, end - start,
- prot & PROT_EXEC ? VM_EXEC : 0);
- if (error)
- return error;
- }
- current->mm->start_brk = current->mm->brk = end;
- return 0;
-}
-
-/* We need to explicitly zero any fractional pages
- after the data section (i.e. bss). This would
- contain the junk from the file that should not
- be in memory
+/*
+ * We need to explicitly zero any trailing portion of the page that follows
+ * p_filesz when it ends before the page ends (e.g. bss), otherwise this
+ * memory will contain the junk from the file that should not be present.
*/
-static int padzero(unsigned long elf_bss)
+static int padzero(unsigned long address)
{
unsigned long nbyte;
- nbyte = ELF_PAGEOFFSET(elf_bss);
+ nbyte = ELF_PAGEOFFSET(address);
if (nbyte) {
nbyte = ELF_MIN_ALIGN - nbyte;
- if (clear_user((void __user *) elf_bss, nbyte))
+ if (clear_user((void __user *)address, nbyte))
return -EFAULT;
}
return 0;
return 0;
}
+/*
+ * Map "eppnt->p_filesz" bytes from "filep" offset "eppnt->p_offset"
+ * into memory at "addr". (Note that p_filesz is rounded up to the
+ * next page, so any extra bytes from the file must be wiped.)
+ */
static unsigned long elf_map(struct file *filep, unsigned long addr,
const struct elf_phdr *eppnt, int prot, int type,
unsigned long total_size)
return(map_addr);
}
+/*
+ * Map "eppnt->p_filesz" bytes from "filep" offset "eppnt->p_offset"
+ * into memory at "addr". Memory from "p_filesz" through "p_memsz"
+ * rounded up to the next page is zeroed.
+ */
+static unsigned long elf_load(struct file *filep, unsigned long addr,
+ const struct elf_phdr *eppnt, int prot, int type,
+ unsigned long total_size)
+{
+ unsigned long zero_start, zero_end;
+ unsigned long map_addr;
+
+ if (eppnt->p_filesz) {
+ map_addr = elf_map(filep, addr, eppnt, prot, type, total_size);
+ if (BAD_ADDR(map_addr))
+ return map_addr;
+ if (eppnt->p_memsz > eppnt->p_filesz) {
+ zero_start = map_addr + ELF_PAGEOFFSET(eppnt->p_vaddr) +
+ eppnt->p_filesz;
+ zero_end = map_addr + ELF_PAGEOFFSET(eppnt->p_vaddr) +
+ eppnt->p_memsz;
+
+ /*
+ * Zero the end of the last mapped page but ignore
+ * any errors if the segment isn't writable.
+ */
+ if (padzero(zero_start) && (prot & PROT_WRITE))
+ return -EFAULT;
+ }
+ } else {
+ map_addr = zero_start = ELF_PAGESTART(addr);
+ zero_end = zero_start + ELF_PAGEOFFSET(eppnt->p_vaddr) +
+ eppnt->p_memsz;
+ }
+ if (eppnt->p_memsz > eppnt->p_filesz) {
+ /*
+ * Map the last of the segment.
+ * If the header is requesting these pages to be
+ * executable, honour that (ppc32 needs this).
+ */
+ int error;
+
+ zero_start = ELF_PAGEALIGN(zero_start);
+ zero_end = ELF_PAGEALIGN(zero_end);
+
+ error = vm_brk_flags(zero_start, zero_end - zero_start,
+ prot & PROT_EXEC ? VM_EXEC : 0);
+ if (error)
+ map_addr = error;
+ }
+ return map_addr;
+}
+
+
static unsigned long total_mapping_size(const struct elf_phdr *phdr, int nr)
{
elf_addr_t min_addr = -1;
struct elf_phdr *eppnt;
unsigned long load_addr = 0;
int load_addr_set = 0;
- unsigned long last_bss = 0, elf_bss = 0;
- int bss_prot = 0;
unsigned long error = ~0UL;
unsigned long total_size;
int i;
else if (no_base && interp_elf_ex->e_type == ET_DYN)
load_addr = -vaddr;
- map_addr = elf_map(interpreter, load_addr + vaddr,
+ map_addr = elf_load(interpreter, load_addr + vaddr,
eppnt, elf_prot, elf_type, total_size);
total_size = 0;
error = map_addr;
error = -ENOMEM;
goto out;
}
-
- /*
- * Find the end of the file mapping for this phdr, and
- * keep track of the largest address we see for this.
- */
- k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
- if (k > elf_bss)
- elf_bss = k;
-
- /*
- * Do the same thing for the memory mapping - between
- * elf_bss and last_bss is the bss section.
- */
- k = load_addr + eppnt->p_vaddr + eppnt->p_memsz;
- if (k > last_bss) {
- last_bss = k;
- bss_prot = elf_prot;
- }
}
}
- /*
- * Now fill out the bss section: first pad the last page from
- * the file up to the page boundary, and zero it from elf_bss
- * up to the end of the page.
- */
- if (padzero(elf_bss)) {
- error = -EFAULT;
- goto out;
- }
- /*
- * Next, align both the file and mem bss up to the page size,
- * since this is where elf_bss was just zeroed up to, and where
- * last_bss will end after the vm_brk_flags() below.
- */
- elf_bss = ELF_PAGEALIGN(elf_bss);
- last_bss = ELF_PAGEALIGN(last_bss);
- /* Finally, if there is still more bss to allocate, do it. */
- if (last_bss > elf_bss) {
- error = vm_brk_flags(elf_bss, last_bss - elf_bss,
- bss_prot & PROT_EXEC ? VM_EXEC : 0);
- if (error)
- goto out;
- }
-
error = load_addr;
out:
return error;
unsigned long error;
struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
struct elf_phdr *elf_property_phdata = NULL;
- unsigned long elf_bss, elf_brk;
- int bss_prot = 0;
+ unsigned long elf_brk;
int retval, i;
unsigned long elf_entry;
unsigned long e_entry;
if (retval < 0)
goto out_free_dentry;
- elf_bss = 0;
elf_brk = 0;
start_code = ~0UL;
if (elf_ppnt->p_type != PT_LOAD)
continue;
- if (unlikely (elf_brk > elf_bss)) {
- unsigned long nbyte;
-
- /* There was a PT_LOAD segment with p_memsz > p_filesz
- before this one. Map anonymous pages, if needed,
- and clear the area. */
- retval = set_brk(elf_bss + load_bias,
- elf_brk + load_bias,
- bss_prot);
- if (retval)
- goto out_free_dentry;
- nbyte = ELF_PAGEOFFSET(elf_bss);
- if (nbyte) {
- nbyte = ELF_MIN_ALIGN - nbyte;
- if (nbyte > elf_brk - elf_bss)
- nbyte = elf_brk - elf_bss;
- if (clear_user((void __user *)elf_bss +
- load_bias, nbyte)) {
- /*
- * This bss-zeroing can fail if the ELF
- * file specifies odd protections. So
- * we don't check the return value
- */
- }
- }
- }
-
elf_prot = make_prot(elf_ppnt->p_flags, &arch_state,
!!interpreter, false);
}
}
- error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
+ error = elf_load(bprm->file, load_bias + vaddr, elf_ppnt,
elf_prot, elf_flags, total_size);
if (BAD_ADDR(error)) {
retval = IS_ERR_VALUE(error) ?
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
- if (k > elf_bss)
- elf_bss = k;
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
end_code = k;
if (end_data < k)
end_data = k;
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
- if (k > elf_brk) {
- bss_prot = elf_prot;
+ if (k > elf_brk)
elf_brk = k;
- }
}
e_entry = elf_ex->e_entry + load_bias;
phdr_addr += load_bias;
- elf_bss += load_bias;
elf_brk += load_bias;
start_code += load_bias;
end_code += load_bias;
start_data += load_bias;
end_data += load_bias;
- /* Calling set_brk effectively mmaps the pages that we need
- * for the bss and break sections. We must do this before
- * mapping in the interpreter, to make sure it doesn't wind
- * up getting placed where the bss needs to go.
- */
- retval = set_brk(elf_bss, elf_brk, bss_prot);
- if (retval)
- goto out_free_dentry;
- if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
- retval = -EFAULT; /* Nobody gets to see this, but.. */
- goto out_free_dentry;
- }
+ current->mm->start_brk = current->mm->brk = ELF_PAGEALIGN(elf_brk);
if (interpreter) {
elf_entry = load_elf_interp(interp_elf_ex,
{
struct elf_phdr *elf_phdata;
struct elf_phdr *eppnt;
- unsigned long elf_bss, bss, len;
int retval, error, i, j;
struct elfhdr elf_ex;
eppnt++;
/* Now use mmap to map the library into memory. */
- error = vm_mmap(file,
- ELF_PAGESTART(eppnt->p_vaddr),
- (eppnt->p_filesz +
- ELF_PAGEOFFSET(eppnt->p_vaddr)),
+ error = elf_load(file, ELF_PAGESTART(eppnt->p_vaddr),
+ eppnt,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED_NOREPLACE | MAP_PRIVATE,
- (eppnt->p_offset -
- ELF_PAGEOFFSET(eppnt->p_vaddr)));
+ 0);
+
if (error != ELF_PAGESTART(eppnt->p_vaddr))
goto out_free_ph;
- elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
- if (padzero(elf_bss)) {
- error = -EFAULT;
- goto out_free_ph;
- }
-
- len = ELF_PAGEALIGN(eppnt->p_filesz + eppnt->p_vaddr);
- bss = ELF_PAGEALIGN(eppnt->p_memsz + eppnt->p_vaddr);
- if (bss > len) {
- error = vm_brk(len, bss - len);
- if (error)
- goto out_free_ph;
- }
error = 0;
out_free_ph:
projects / linux-2.6-microblaze.git / blobdiff