diff options
Diffstat (limited to 'fs/binfmt_elf_fdpic.c')
| -rw-r--r-- | fs/binfmt_elf_fdpic.c | 63 |
1 files changed, 61 insertions, 2 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 112da491d75..e49d9c06a4b 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -1505,6 +1505,22 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t) return sz; } +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; +} + /* * dump the segments for an MMU process */ @@ -1569,6 +1585,17 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size, } #endif +static size_t elf_core_vma_data_size(unsigned long mm_flags) +{ + struct vm_area_struct *vma; + size_t size = 0; + + for (vma = current->mm->mmap; vma; vma->vm_next) + if (maydump(vma, mm_flags)) + size += vma->vm_end - vma->vm_start; + return size; +} + /* * Actual dumper * @@ -1601,6 +1628,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) elf_addr_t *auxv; unsigned long mm_flags; 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. @@ -1667,8 +1697,16 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) segs = current->mm->map_count; segs += elf_core_extra_phdrs(); + /* 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; + /* Set up header */ - fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ + fill_elf_fdpic_header(elf, e_phnum); has_dumped = 1; current->flags |= PF_DUMPCORE; @@ -1708,7 +1746,7 @@ static int elf_fdpic_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 */ @@ -1738,6 +1776,19 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) */ mm_flags = current->mm->flags; + offset += elf_core_vma_data_size(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; @@ -1802,6 +1853,14 @@ static int elf_fdpic_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; + } + if (cprm->file->f_pos != offset) { /* Sanity check */ printk(KERN_WARNING |