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
* don't even try.
*/
#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file);
+static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
#else
#define elf_core_dump NULL
#endif
.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)
{
struct task_struct *tsk = current;
struct vm_area_struct *vma;
+ /*
+ * In some cases (e.g. Hyper-Threading), we want to avoid L1
+ * evictions by the processes running on the same package. One
+ * thing we can do is to shuffle the initial stack for them.
+ */
+
+ p = arch_align_stack(p);
+
/*
* If this architecture has a platform capability string, copy it
* to userspace. In some cases (Sparc), this info is impossible
if (k_platform) {
size_t len = strlen(k_platform) + 1;
- /*
- * In some cases (e.g. Hyper-Threading), we want to avoid L1
- * evictions by the processes running on the same package. One
- * thing we can do is to shuffle the initial stack for them.
- */
-
- p = arch_align_stack(p);
-
u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
if (__copy_to_user(u_platform, k_platform, len))
return -EFAULT;
/* Create the ELF interpreter info */
elf_info = (elf_addr_t *)current->mm->saved_auxv;
+ /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
#define NEW_AUX_ENT(id, val) \
do { \
elf_info[ei_index++] = id; \
/*
* ARCH_DLINFO must come first so PPC can do its special alignment of
* AUXV.
+ * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
+ * ARCH_DLINFO changes
*/
ARCH_DLINFO;
#endif
#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(¤t->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(¤t->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(¤t->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;
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 */
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) {
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;
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);
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];
/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
+ static int warn;
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
/* Now figure out which format our binary is */
if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
interpreter_type &= ~INTERPRETER_ELF;
+ if (interpreter_type == INTERPRETER_AOUT && 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)
goto out_free_dentry;
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;
* 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) ?
}
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) ?
}
/*
- * Decide whether a segment is worth dumping; default is yes to be
- * sure (missing info is worse than too much; etc).
- * Personally I'd include everything, and use the coredump limit...
- *
- * I think we should skip something. But I am not sure how. H.J.
+ * Decide what to dump of a segment, part, all or none.
*/
-static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
+static unsigned long vma_dump_size(struct vm_area_struct *vma,
+ unsigned long mm_flags)
{
/* The vma can be set up to tell us the answer directly. */
if (vma->vm_flags & VM_ALWAYSDUMP)
- return 1;
+ goto whole;
/* Do not dump I/O mapped devices or special mappings */
if (vma->vm_flags & (VM_IO | VM_RESERVED))
return 0;
+#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
+
/* By default, dump shared memory if mapped from an anonymous file. */
if (vma->vm_flags & VM_SHARED) {
- if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0)
- return test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
- else
- return test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
+ if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ?
+ FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
+ goto whole;
+ return 0;
}
- /* By default, if it hasn't been written to, don't write it out. */
- if (!vma->anon_vma)
- return test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
+ /* Dump segments that have been written to. */
+ if (vma->anon_vma && FILTER(ANON_PRIVATE))
+ goto whole;
+ if (vma->vm_file == NULL)
+ return 0;
- return test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
+ if (FILTER(MAPPED_PRIVATE))
+ goto whole;
+
+ /*
+ * If this looks like the beginning of a DSO or executable mapping,
+ * check for an ELF header. If we find one, dump the first page to
+ * aid in determining what was mapped here.
+ */
+ if (FILTER(ELF_HEADERS) && vma->vm_file != NULL && vma->vm_pgoff == 0) {
+ u32 __user *header = (u32 __user *) vma->vm_start;
+ u32 word;
+ /*
+ * Doing it this way gets the constant folded by GCC.
+ */
+ union {
+ u32 cmp;
+ char elfmag[SELFMAG];
+ } magic;
+ BUILD_BUG_ON(SELFMAG != sizeof word);
+ magic.elfmag[EI_MAG0] = ELFMAG0;
+ magic.elfmag[EI_MAG1] = ELFMAG1;
+ magic.elfmag[EI_MAG2] = ELFMAG2;
+ magic.elfmag[EI_MAG3] = ELFMAG3;
+ if (get_user(word, header) == 0 && word == magic.cmp)
+ return PAGE_SIZE;
+ }
+
+#undef FILTER
+
+ return 0;
+
+whole:
+ return vma->vm_end - vma->vm_start;
}
/* An ELF note in memory */
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
prstatus->pr_sigpend = p->pending.signal.sig[0];
prstatus->pr_sighold = p->blocked.sig[0];
- prstatus->pr_pid = p->pid;
- prstatus->pr_ppid = p->parent->pid;
- prstatus->pr_pgrp = process_group(p);
- prstatus->pr_sid = process_session(p);
+ prstatus->pr_pid = task_pid_vnr(p);
+ prstatus->pr_ppid = task_pid_vnr(p->parent);
+ prstatus->pr_pgrp = task_pgrp_vnr(p);
+ prstatus->pr_sid = task_session_vnr(p);
if (thread_group_leader(p)) {
/*
* This is the record for the group leader. Add in the
psinfo->pr_psargs[i] = ' ';
psinfo->pr_psargs[len] = 0;
- psinfo->pr_pid = p->pid;
- psinfo->pr_ppid = p->parent->pid;
- psinfo->pr_pgrp = process_group(p);
- psinfo->pr_sid = process_session(p);
+ psinfo->pr_pid = task_pid_vnr(p);
+ psinfo->pr_ppid = task_pid_vnr(p->parent);
+ psinfo->pr_pgrp = task_pgrp_vnr(p);
+ psinfo->pr_sid = task_session_vnr(p);
i = p->state ? ffz(~p->state) + 1 : 0;
psinfo->pr_state = i;
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t xfpu; /* NT_PRXFPREG */
+ elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
#endif
struct memelfnote notes[3];
int num_notes;
#ifdef ELF_CORE_COPY_XFPREGS
if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
- fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
- &t->xfpu);
+ fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
+ sizeof(t->xfpu), &t->xfpu);
t->num_notes++;
sz += notesize(&t->notes[2]);
}
* and then they are actually written out. If we run out of core limit
* we just truncate.
*/
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
+static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
{
#define NUM_NOTES 6
int has_dumped = 0;
struct vm_area_struct *vma, *gate_vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff, foffset;
- unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
int numnote;
struct memelfnote *notes = NULL;
struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
int thread_status_size = 0;
elf_addr_t *auxv;
unsigned long mm_flags;
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
- int extra_notes_size;
-#endif
/*
* We no longer stop all VM operations.
#ifdef ELF_CORE_COPY_XFPREGS
if (elf_core_copy_task_xfpregs(current, xfpu))
fill_note(notes + numnote++,
- "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
+ "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
#endif
fs = get_fs();
sz += thread_status_size;
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
- extra_notes_size = ELF_CORE_EXTRA_NOTES_SIZE;
- sz += extra_notes_size;
-#endif
+ sz += elf_coredump_extra_notes_size();
fill_elf_note_phdr(&phdr, sz, offset);
offset += sz;
for (vma = first_vma(current, gate_vma); vma != NULL;
vma = next_vma(vma, gate_vma)) {
struct elf_phdr phdr;
- size_t sz;
-
- sz = vma->vm_end - vma->vm_start;
phdr.p_type = PT_LOAD;
phdr.p_offset = offset;
phdr.p_vaddr = vma->vm_start;
phdr.p_paddr = 0;
- phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0;
- phdr.p_memsz = sz;
+ phdr.p_filesz = vma_dump_size(vma, mm_flags);
+ phdr.p_memsz = vma->vm_end - vma->vm_start;
offset += phdr.p_filesz;
phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
if (vma->vm_flags & VM_WRITE)
if (!writenote(notes + i, file, &foffset))
goto end_coredump;
-#ifdef ELF_CORE_WRITE_EXTRA_NOTES
- ELF_CORE_WRITE_EXTRA_NOTES;
- foffset += extra_notes_size;
-#endif
+ if (elf_coredump_extra_notes_write(file, &foffset))
+ goto end_coredump;
/* write out the thread status notes section */
list_for_each(t, &thread_list) {
for (vma = first_vma(current, gate_vma); vma != NULL;
vma = next_vma(vma, gate_vma)) {
unsigned long addr;
+ unsigned long end;
- if (!maydump(vma, mm_flags))
- continue;
+ end = vma->vm_start + vma_dump_size(vma, mm_flags);
- for (addr = vma->vm_start;
- addr < vma->vm_end;
- addr += PAGE_SIZE) {
+ for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
struct page *page;
struct vm_area_struct *vma;
&page, &vma) <= 0) {
DUMP_SEEK(PAGE_SIZE);
} else {
- if (page == ZERO_PAGE(addr)) {
+ if (page == ZERO_PAGE(0)) {
if (!dump_seek(file, PAGE_SIZE)) {
page_cache_release(page);
goto end_coredump;
git.samba.org / sfrench / cifs-2.6.git / blobdiff