1 files changed, 38 insertions, 21 deletions

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 18d77297ccc8..32d9b44c3cb9 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1226,11 +1226,22 @@ static int dump_write(struct file *file, const void *addr, int nr)
 
 static int dump_seek(struct file *file, loff_t off)
 {
-        if (file->f_op->llseek) {
-                if (file->f_op->llseek(file, off, SEEK_SET) != off)
+        if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
+                if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
                         return 0;
         } else {
-                file->f_pos = off;
+                char *buf = (char *)get_zeroed_page(GFP_KERNEL);
+                if (!buf)
+                        return 0;
+                while (off > 0) {
+                        unsigned long n = off;
+                        if (n > PAGE_SIZE)
+                                n = PAGE_SIZE;
+                        if (!dump_write(file, buf, n))
+                                return 0;
+                        off -= n;
+                }
+                free_page((unsigned long)buf);
         }
         return 1;
 }
@@ -1313,30 +1324,35 @@ static int notesize(struct memelfnote *en)
 
 /* #define DEBUG */
 
-#define DUMP_WRITE(addr, nr)    \
-        do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
-#define DUMP_SEEK(off)  \
-        do { if (!dump_seek(file, (off))) return 0; } while(0)
+#define DUMP_WRITE(addr, nr, foffset)   \
+        do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
 
-static int writenote(struct memelfnote *men, struct file *file)
+static int alignfile(struct file *file, loff_t *foffset)
 {
-        struct elf_note en;
+        static const char buf[4] = { 0, };
+        DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
+        return 1;
+}
 
+static int writenote(struct memelfnote *men, struct file *file,
+                        loff_t *foffset)
+{
+        struct elf_note en;
         en.n_namesz = strlen(men->name) + 1;
         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 */
-        DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
-        DUMP_WRITE(men->data, men->datasz);
-        DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
+        DUMP_WRITE(&en, sizeof(en), foffset);
+        DUMP_WRITE(men->name, en.n_namesz, foffset);
+        if (!alignfile(file, foffset))
+                return 0;
+        DUMP_WRITE(men->data, men->datasz, foffset);
+        if (!alignfile(file, foffset))
+                return 0;
 
         return 1;
 }
 #undef DUMP_WRITE
-#undef DUMP_SEEK
 
 #define DUMP_WRITE(addr, nr)                            \
         if ((size += (nr)) > cprm->limit ||             \
@@ -1552,7 +1568,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                                         err = -EIO;
                                 kunmap(page);
                                 page_cache_release(page);
-                        } else if (!dump_seek(file, file->f_pos + PAGE_SIZE))
+                        } else if (!dump_seek(file, PAGE_SIZE))
                                 err = -EFBIG;
                         if (err)
                                 goto out;
@@ -1605,7 +1621,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
         int i;
         struct vm_area_struct *vma;
         struct elfhdr *elf = NULL;
-        loff_t offset = 0, dataoff;
+        loff_t offset = 0, dataoff, foffset;
         int numnote;
         struct memelfnote *notes = NULL;
         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
@@ -1730,6 +1746,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
         DUMP_WRITE(elf, sizeof(*elf));
         offset += sizeof(*elf);                         /* Elf header */
         offset += (segs+1) * sizeof(struct elf_phdr);   /* Program headers */
+        foffset = offset;
 
         /* Write notes phdr entry */
         {
@@ -1786,7 +1803,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
 
         /* write out the notes section */
         for (i = 0; i < numnote; i++)
-                if (!writenote(notes + i, cprm->file))
+                if (!writenote(notes + i, cprm->file, &foffset))
                         goto end_coredump;
 
         /* write out the thread status notes section */
@@ -1795,11 +1812,11 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
                                 list_entry(t, struct elf_thread_status, list);
 
                 for (i = 0; i < tmp->num_notes; i++)
-                        if (!writenote(&tmp->notes[i], cprm->file))
+                        if (!writenote(&tmp->notes[i], cprm->file, &foffset))
                                 goto end_coredump;
         }
 
-        if (!dump_seek(cprm->file, dataoff))
+        if (!dump_seek(cprm->file, dataoff - foffset))
                 goto end_coredump;
 
         if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,