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path: root/fs/binfmt_elf.c
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Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c66
1 files changed, 63 insertions, 3 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 6fc49b6ed93..78de530cfb0 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1838,6 +1838,34 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
return gate_vma;
}
+static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
+ elf_addr_t e_shoff, int segs)
+{
+ elf->e_shoff = e_shoff;
+ elf->e_shentsize = sizeof(*shdr4extnum);
+ elf->e_shnum = 1;
+ elf->e_shstrndx = SHN_UNDEF;
+
+ memset(shdr4extnum, 0, sizeof(*shdr4extnum));
+
+ shdr4extnum->sh_type = SHT_NULL;
+ shdr4extnum->sh_size = elf->e_shnum;
+ shdr4extnum->sh_link = elf->e_shstrndx;
+ shdr4extnum->sh_info = segs;
+}
+
+static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma,
+ unsigned long mm_flags)
+{
+ struct vm_area_struct *vma;
+ size_t size = 0;
+
+ for (vma = first_vma(current, gate_vma); vma != NULL;
+ vma = next_vma(vma, gate_vma))
+ size += vma_dump_size(vma, mm_flags);
+ return size;
+}
+
/*
* Actual dumper
*
@@ -1857,6 +1885,9 @@ static int elf_core_dump(struct coredump_params *cprm)
unsigned long mm_flags;
struct elf_note_info info;
struct elf_phdr *phdr4note = NULL;
+ struct elf_shdr *shdr4extnum = NULL;
+ Elf_Half e_phnum;
+ elf_addr_t e_shoff;
/*
* We no longer stop all VM operations.
@@ -1885,12 +1916,19 @@ static int elf_core_dump(struct coredump_params *cprm)
if (gate_vma != NULL)
segs++;
+ /* for notes section */
+ segs++;
+
+ /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
+ * this, kernel supports extended numbering. Have a look at
+ * include/linux/elf.h for further information. */
+ e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
+
/*
* Collect all the non-memory information about the process for the
* notes. This also sets up the file header.
*/
- if (!fill_note_info(elf, segs + 1, /* including notes section */
- &info, cprm->signr, cprm->regs))
+ if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs))
goto cleanup;
has_dumped = 1;
@@ -1900,7 +1938,7 @@ static int elf_core_dump(struct coredump_params *cprm)
set_fs(KERNEL_DS);
offset += sizeof(*elf); /* Elf header */
- offset += (segs + 1) * sizeof(struct elf_phdr); /* Program headers */
+ offset += segs * sizeof(struct elf_phdr); /* Program headers */
foffset = offset;
/* Write notes phdr entry */
@@ -1926,6 +1964,19 @@ static int elf_core_dump(struct coredump_params *cprm)
*/
mm_flags = current->mm->flags;
+ offset += elf_core_vma_data_size(gate_vma, mm_flags);
+ offset += elf_core_extra_data_size();
+ e_shoff = offset;
+
+ if (e_phnum == PN_XNUM) {
+ shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
+ if (!shdr4extnum)
+ goto end_coredump;
+ fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
+ }
+
+ offset = dataoff;
+
size += sizeof(*elf);
if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
goto end_coredump;
@@ -2003,11 +2054,20 @@ static int elf_core_dump(struct coredump_params *cprm)
if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
goto end_coredump;
+ if (e_phnum == PN_XNUM) {
+ size += sizeof(*shdr4extnum);
+ if (size > cprm->limit
+ || !dump_write(cprm->file, shdr4extnum,
+ sizeof(*shdr4extnum)))
+ goto end_coredump;
+ }
+
end_coredump:
set_fs(fs);
cleanup:
free_note_info(&info);
+ kfree(shdr4extnum);
kfree(phdr4note);
kfree(elf);
out: