Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 404 insertions, 0 deletions

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
new file mode 100644
index 000000000000..1c7da988fcc3
--- /dev/null
+++ b/fs/proc/kcore.c
@@ -0,0 +1,404 @@
+/*
+ *      fs/proc/kcore.c kernel ELF core dumper
+ *
+ *      Modelled on fs/exec.c:aout_core_dump()
+ *      Jeremy Fitzhardinge <jeremy@sw.oz.au>
+ *      ELF version written by David Howells <David.Howells@nexor.co.uk>
+ *      Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com>
+ *      Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com>
+ *      Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com>
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
+#include <linux/vmalloc.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+
+static int open_kcore(struct inode * inode, struct file * filp)
+{
+        return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
+}
+
+static ssize_t read_kcore(struct file *, char __user *, size_t, loff_t *);
+
+struct file_operations proc_kcore_operations = {
+        .read           = read_kcore,
+        .open           = open_kcore,
+};
+
+#ifndef kc_vaddr_to_offset
+#define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)
+#endif
+#ifndef kc_offset_to_vaddr
+#define kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET)
+#endif
+
+#define roundup(x, y)  ((((x)+((y)-1))/(y))*(y))
+
+/* An ELF note in memory */
+struct memelfnote
+{
+        const char *name;
+        int type;
+        unsigned int datasz;
+        void *data;
+};
+
+static struct kcore_list *kclist;
+static DEFINE_RWLOCK(kclist_lock);
+
+void
+kclist_add(struct kcore_list *new, void *addr, size_t size)
+{
+        new->addr = (unsigned long)addr;
+        new->size = size;
+
+        write_lock(&kclist_lock);
+        new->next = kclist;
+        kclist = new;
+        write_unlock(&kclist_lock);
+}
+
+static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
+{
+        size_t try, size;
+        struct kcore_list *m;
+
+        *nphdr = 1; /* PT_NOTE */
+        size = 0;
+
+        for (m=kclist; m; m=m->next) {
+                try = kc_vaddr_to_offset((size_t)m->addr + m->size);
+                if (try > size)
+                        size = try;
+                *nphdr = *nphdr + 1;
+        }
+        *elf_buflen =   sizeof(struct elfhdr) + 
+                        (*nphdr + 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 + *elf_buflen;
+}
+
+
+/*****************************************************************************/
+/*
+ * 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
+ * nphdr is the number of elf_phdr to insert
+ */
+static void elf_kcore_store_hdr(char *bufp, int nphdr, 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;
+        struct kcore_list *m;
+
+        /* 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;
+        elf->e_ident[EI_OSABI] = ELF_OSABI;
+        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;
+#if defined(CONFIG_H8300)
+        elf->e_flags    = ELF_FLAGS;
+#else
+        elf->e_flags    = 0;
+#endif
+        elf->e_ehsize   = sizeof(struct elfhdr);
+        elf->e_phentsize= sizeof(struct elf_phdr);
+        elf->e_phnum    = nphdr;
+        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 every area */
+        for (m=kclist; m; m=m->next) {
+                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  = kc_vaddr_to_offset(m->addr) + dataoff;
+                phdr->p_vaddr   = (size_t)m->addr;
+                phdr->p_paddr   = 0;
+                phdr->p_filesz  = phdr->p_memsz = m->size;
+                phdr->p_align   = PAGE_SIZE;
+        }
+
+        /*
+         * 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(&notes[0]);
+        bufp = storenote(&notes[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(&notes[1]);
+        bufp = storenote(&notes[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(&notes[2]);
+        bufp = storenote(&notes[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 __user *buffer, size_t buflen, loff_t *fpos)
+{
+        ssize_t acc = 0;
+        size_t size, tsz;
+        size_t elf_buflen;
+        int nphdr;
+        unsigned long start;
+
+        read_lock(&kclist_lock);
+        proc_root_kcore->size = size = get_kcore_size(&nphdr, &elf_buflen);
+        if (buflen == 0 || *fpos >= size) {
+                read_unlock(&kclist_lock);
+                return 0;
+        }
+
+        /* 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) {
+                        read_unlock(&kclist_lock);
+                        return -ENOMEM;
+                }
+                memset(elf_buf, 0, elf_buflen);
+                elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen);
+                read_unlock(&kclist_lock);
+                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
+                read_unlock(&kclist_lock);
+
+        /*
+         * Check to see if our file offset matches with any of
+         * the addresses in the elf_phdr on our list.
+         */
+        start = kc_offset_to_vaddr(*fpos - elf_buflen);
+        if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
+                tsz = buflen;
+                
+        while (buflen) {
+                struct kcore_list *m;
+
+                read_lock(&kclist_lock);
+                for (m=kclist; m; m=m->next) {
+                        if (start >= m->addr && start < (m->addr+m->size))
+                                break;
+                }
+                read_unlock(&kclist_lock);
+
+                if (m == NULL) {
+                        if (clear_user(buffer, tsz))
+                                return -EFAULT;
+                } else if ((start >= VMALLOC_START) && (start < VMALLOC_END)) {
+                        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);
+                        if (copy_to_user(buffer, elf_buf, tsz)) {
+                                kfree(elf_buf);
+                                return -EFAULT;
+                        }
+                        kfree(elf_buf);
+                } else {
+                        if (kern_addr_valid(start)) {
+                                unsigned long n;
+
+                                n = copy_to_user(buffer, (char *)start, tsz);
+                                /*
+                                 * We cannot distingush between fault on source
+                                 * and fault on destination. When this happens
+                                 * we clear too and hope it will trigger the
+                                 * EFAULT again.
+                                 */
+                                if (n) { 
+                                        if (clear_user(buffer + tsz - n,
+                                                                tsz - n))
+                                                return -EFAULT;
+                                }
+                        } else {
+                                if (clear_user(buffer, tsz))
+                                        return -EFAULT;
+                        }
+                }
+                buflen -= tsz;
+                *fpos += tsz;
+                buffer += tsz;
+                acc += tsz;
+                start += tsz;
+                tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
+        }
+
+        return acc;
+}