int kern_ptr_validate(const void *ptr, unsigned long size)
{
unsigned long addr = (unsigned long)ptr;
unsigned long min_addr = PAGE_OFFSET;
unsigned long align_mask = sizeof(void *) - 1;
if (unlikely(addr < min_addr))
goto out;
if (unlikely(addr > (unsigned long)high_memory - size))
goto out;
if (unlikely(addr & align_mask))
goto out;
if (unlikely(!kern_addr_valid(addr)))
goto out;
if (unlikely(!kern_addr_valid(addr + size - 1)))
goto out;
return 1;
out:
return 0;
}
static unsigned long get_kcore_size(int *num_vma, size_t *elf_buflen)
{
unsigned long size;
#ifndef NO_MM
unsigned long try;
struct vm_struct *m;
#endif
*num_vma = 0;
size = ((size_t)high_memory - PAGE_OFFSET + PAGE_SIZE);
#ifdef NO_MM
/* vmlist is not available then */
*elf_buflen = PAGE_SIZE;
return size;
#else
if (!vmlist) {
*elf_buflen = PAGE_SIZE;
return (size);
}
for (m=vmlist; m; m=m->next) {
try = (unsigned long)m->addr + m->size;
if (try > size)
size = try;
*num_vma = *num_vma + 1;
}
*elf_buflen = sizeof(struct elfhdr) +
(*num_vma + 2)*sizeof(struct elf_phdr) +
3 * (sizeof(struct elf_note) + 4) +
sizeof(struct elf_prstatus) +
sizeof(struct elf_prpsinfo) +
sizeof(struct task_struct);
*elf_buflen = PAGE_ALIGN(*elf_buflen);
return (size - PAGE_OFFSET + *elf_buflen);
#endif
}
/*****************************************************************************/
/*
* determine size of ELF note
*/
static int notesize(struct memelfnote *en)
{
int sz;
sz = sizeof(struct elf_note);
sz += roundup(strlen(en->name), 4);
sz += roundup(en->datasz, 4);
return sz;
} /* end notesize() */
/*****************************************************************************/
/*
* store a note in the header buffer
*/
static char *storenote(struct memelfnote *men, char *bufp)
{
struct elf_note en;
#define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0)
en.n_namesz = strlen(men->name);
en.n_descsz = men->datasz;
en.n_type = men->type;
DUMP_WRITE(&en, sizeof(en));
DUMP_WRITE(men->name, en.n_namesz);
/* XXX - cast from long long to long to avoid need for libgcc.a */
bufp = (char*) roundup((unsigned long)bufp,4);
DUMP_WRITE(men->data, men->datasz);
bufp = (char*) roundup((unsigned long)bufp,4);
#undef DUMP_WRITE
return bufp;
} /* end storenote() */
/*
* store an ELF coredump header in the supplied buffer
* num_vma is the number of elements in vmlist
*/
static void elf_kcore_store_hdr(char *bufp, int num_vma, int dataoff)
{
struct elf_prstatus prstatus; /* NT_PRSTATUS */
struct elf_prpsinfo prpsinfo; /* NT_PRPSINFO */
struct elf_phdr *nhdr, *phdr;
struct elfhdr *elf;
struct memelfnote notes[3];
off_t offset = 0;
#ifndef NO_MM
struct vm_struct *m;
#endif
/* setup ELF header */
elf = (struct elfhdr *) bufp;
bufp += sizeof(struct elfhdr);
offset += sizeof(struct elfhdr);
memcpy(elf->e_ident, ELFMAG, SELFMAG);
elf->e_ident[EI_CLASS] = ELF_CLASS;
elf->e_ident[EI_DATA] = ELF_DATA;
elf->e_ident[EI_VERSION]= EV_CURRENT;
memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
elf->e_type = ET_CORE;
elf->e_machine = ELF_ARCH;
elf->e_version = EV_CURRENT;
elf->e_entry = 0;
elf->e_phoff = sizeof(struct elfhdr);
elf->e_shoff = 0;
elf->e_flags = 0;
elf->e_ehsize = sizeof(struct elfhdr);
elf->e_phentsize= sizeof(struct elf_phdr);
elf->e_phnum = 2 + num_vma;
elf->e_shentsize= 0;
elf->e_shnum = 0;
elf->e_shstrndx = 0;
/* setup ELF PT_NOTE program header */
nhdr = (struct elf_phdr *) bufp;
bufp += sizeof(struct elf_phdr);
offset += sizeof(struct elf_phdr);
nhdr->p_type = PT_NOTE;
nhdr->p_offset = 0;
nhdr->p_vaddr = 0;
nhdr->p_paddr = 0;
nhdr->p_filesz = 0;
nhdr->p_memsz = 0;
nhdr->p_flags = 0;
nhdr->p_align = 0;
/* setup ELF PT_LOAD program header for the
* virtual range 0xc0000000 -> high_memory */
phdr = (struct elf_phdr *) bufp;
bufp += sizeof(struct elf_phdr);
offset += sizeof(struct elf_phdr);
phdr->p_type = PT_LOAD;
phdr->p_flags = PF_R|PF_W|PF_X;
phdr->p_offset = dataoff;
phdr->p_vaddr = PAGE_OFFSET;
phdr->p_paddr = __pa(PAGE_OFFSET);
phdr->p_filesz = phdr->p_memsz = ((unsigned long)high_memory - PAGE_OFFSET);
phdr->p_align = PAGE_SIZE;
#ifndef NO_MM
/* setup ELF PT_LOAD program header for every vmalloc'd area */
for (m=vmlist; m; m=m->next) {
if (m->flags & VM_IOREMAP) /* don't dump ioremap'd stuff! (TA) */
continue;
phdr = (struct elf_phdr *) bufp;
bufp += sizeof(struct elf_phdr);
offset += sizeof(struct elf_phdr);
phdr->p_type = PT_LOAD;
phdr->p_flags = PF_R|PF_W|PF_X;
phdr->p_offset = (size_t)m->addr - PAGE_OFFSET + dataoff;
phdr->p_vaddr = (size_t)m->addr;
phdr->p_paddr = __pa(m->addr);
phdr->p_filesz = phdr->p_memsz = m->size;
phdr->p_align = PAGE_SIZE;
}
#endif /* NO_MM */
/*
* Set up the notes in similar form to SVR4 core dumps made
* with info from their /proc.
*/
nhdr->p_offset = offset;
/* set up the process status */
notes[0].name = "CORE";
notes[0].type = NT_PRSTATUS;
notes[0].datasz = sizeof(struct elf_prstatus);
notes[0].data = &prstatus;
memset(&prstatus, 0, sizeof(struct elf_prstatus));
nhdr->p_filesz += notesize(¬es[0]);
bufp = storenote(¬es[0], bufp);
/* set up the process info */
notes[1].name = "CORE";
notes[1].type = NT_PRPSINFO;
notes[1].datasz = sizeof(struct elf_prpsinfo);
notes[1].data = &prpsinfo;
memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo));
prpsinfo.pr_state = 0;
prpsinfo.pr_sname = 'R';
prpsinfo.pr_zomb = 0;
strcpy(prpsinfo.pr_fname, "vmlinux");
strncpy(prpsinfo.pr_psargs, saved_command_line, ELF_PRARGSZ);
nhdr->p_filesz += notesize(¬es[1]);
bufp = storenote(¬es[1], bufp);
/* set up the task structure */
notes[2].name = "CORE";
notes[2].type = NT_TASKSTRUCT;
notes[2].datasz = sizeof(struct task_struct);
notes[2].data = current;
nhdr->p_filesz += notesize(¬es[2]);
bufp = storenote(¬es[2], bufp);
} /* end elf_kcore_store_hdr() */
/*****************************************************************************/
/*
* read from the ELF header and then kernel memory
*/
static ssize_t read_kcore(struct file *file, char *buffer, size_t buflen, loff_t *fpos)
{
ssize_t acc = 0;
unsigned long size, tsz;
size_t elf_buflen;
int num_vma;
unsigned long start;
#ifdef NO_MM
proc_root_kcore->size = size = get_kcore_size(&num_vma, &elf_buflen);
#else
read_lock(&vmlist_lock);
proc_root_kcore->size = size = get_kcore_size(&num_vma, &elf_buflen);
if (buflen == 0 || (unsigned long long)*fpos >= size) {
read_unlock(&vmlist_lock);
return 0;
}
#endif /* NO_MM */
/* trim buflen to not go beyond EOF */
if (buflen > size - *fpos)
buflen = size - *fpos;
/* construct an ELF core header if we'll need some of it */
if (*fpos < elf_buflen) {
char * elf_buf;
tsz = elf_buflen - *fpos;
if (buflen < tsz)
tsz = buflen;
elf_buf = kmalloc(elf_buflen, GFP_ATOMIC);
if (!elf_buf) {
#ifndef NO_MM
read_unlock(&vmlist_lock);
#endif
return -ENOMEM;
}
memset(elf_buf, 0, elf_buflen);
elf_kcore_store_hdr(elf_buf, num_vma, elf_buflen);
#ifndef NO_MM
read_unlock(&vmlist_lock);
#endif
if (copy_to_user(buffer, elf_buf + *fpos, tsz)) {
kfree(elf_buf);
return -EFAULT;
}
kfree(elf_buf);
buflen -= tsz;
*fpos += tsz;
buffer += tsz;
acc += tsz;
/* leave now if filled buffer already */
if (buflen == 0)
return acc;
} else {
#ifndef NO_MM
read_unlock(&vmlist_lock);
#endif
}
/* where page 0 not mapped, write zeros into buffer */
#if defined (__i386__) || defined (__mc68000__) || defined(__x86_64__)
if (*fpos < PAGE_SIZE + elf_buflen) {
/* work out how much to clear */
tsz = PAGE_SIZE + elf_buflen - *fpos;
if (buflen < tsz)
tsz = buflen;
/* write zeros to buffer */
if (clear_user(buffer, tsz))
return -EFAULT;
buflen -= tsz;
*fpos += tsz;
buffer += tsz;
acc += tsz;
/* leave now if filled buffer already */
if (buflen == 0)
return tsz;
}
#endif
/*
* Fill the remainder of the buffer from kernel VM space.
* We said in the ELF header that the data which starts
* at 'elf_buflen' is virtual address PAGE_OFFSET. --rmk
*/
start = PAGE_OFFSET + (*fpos - elf_buflen);
if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
tsz = buflen;
while (buflen) {
int err = 0;
if ((start > PAGE_OFFSET) && (start < (unsigned long)high_memory)) {
if (kern_addr_valid(start)) {
err = copy_to_user(buffer, (char *)start, tsz);
} else {
err = clear_user(buffer, tsz);
}
} else {
#ifndef NO_MM
char * elf_buf;
struct vm_struct *m;
unsigned long curstart = start;
unsigned long cursize = tsz;
elf_buf = kmalloc(tsz, GFP_KERNEL);
if (!elf_buf)
return -ENOMEM;
memset(elf_buf, 0, tsz);
read_lock(&vmlist_lock);
for (m=vmlist; m && cursize; m=m->next) {
unsigned long vmstart;
unsigned long vmsize;
unsigned long msize = m->size - PAGE_SIZE;
if (((unsigned long)m->addr + msize) <
curstart)
continue;
if ((unsigned long)m->addr > (curstart +
cursize))
break;
vmstart = (curstart < (unsigned long)m->addr ?
(unsigned long)m->addr : curstart);
if (((unsigned long)m->addr + msize) >
(curstart + cursize))
vmsize = curstart + cursize - vmstart;
else
vmsize = (unsigned long)m->addr +
msize - vmstart;
curstart = vmstart + vmsize;
cursize -= vmsize;
/* don't dump ioremap'd stuff! (TA) */
if (m->flags & VM_IOREMAP)
continue;
memcpy(elf_buf + (vmstart - start),
(char *)vmstart, vmsize);
}
read_unlock(&vmlist_lock);
err = copy_to_user(buffer, elf_buf, tsz);
kfree(elf_buf);
#endif /* NO_MM */
}
if (err)
return -EFAULT;
buflen -= tsz;
*fpos += tsz;
buffer += tsz;
acc += tsz;
start += tsz;
tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
}
return acc;
}
