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Date: Wed, 09 Oct 2013 01:15:07 +0100
From: Al Viro <viro@....linux.org.uk>
To: torvalds@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 06/13] convert the rest of binfmt_elf_fdpic to
dump_emit()
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 109 ++++++++++++++-----------------------------------
1 files changed, 31 insertions(+), 78 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 77bf7e3..1806e25 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1267,35 +1267,23 @@ static int notesize(struct memelfnote *en)
/* #define DEBUG */
-#define DUMP_WRITE(addr, nr, foffset) \
- do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
-
-static int alignfile(struct file *file, loff_t *foffset)
+static int alignfile(struct coredump_params *cprm)
{
static const char buf[4] = { 0, };
- DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
- return 1;
+ return dump_emit(cprm, buf, roundup(cprm->written, 4) - cprm->written);
}
-static int writenote(struct memelfnote *men, struct file *file,
- loff_t *foffset)
+static int writenote(struct memelfnote *men, struct coredump_params *cprm)
{
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), 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;
+ return dump_emit(cprm, &en, sizeof(en)) &&
+ dump_emit(cprm, men->name, en.n_namesz) && alignfile(cprm) &&
+ dump_emit(cprm, men->data, men->datasz) && alignfile(cprm);
}
-#undef DUMP_WRITE
static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
{
@@ -1500,12 +1488,10 @@ static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
/*
* dump the segments for an MMU process
*/
-#ifdef CONFIG_MMU
-static int elf_fdpic_dump_segments(struct file *file, size_t *size,
- unsigned long *limit, unsigned long mm_flags)
+static bool elf_fdpic_dump_segments(struct coredump_params *cprm,
+ unsigned long mm_flags)
{
struct vm_area_struct *vma;
- int err = 0;
for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
unsigned long addr;
@@ -1513,53 +1499,30 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
if (!maydump(vma, mm_flags))
continue;
+#ifdef CONFIG_MMU
for (addr = vma->vm_start; addr < vma->vm_end;
addr += PAGE_SIZE) {
+ bool res;
struct page *page = get_dump_page(addr);
if (page) {
void *kaddr = kmap(page);
- *size += PAGE_SIZE;
- if (*size > *limit)
- err = -EFBIG;
- else if (!dump_write(file, kaddr, PAGE_SIZE))
- err = -EIO;
+ res = dump_emit(cprm, kaddr, PAGE_SIZE);
kunmap(page);
page_cache_release(page);
- } else if (!dump_seek(file, PAGE_SIZE))
- err = -EFBIG;
- if (err)
- goto out;
+ } else {
+ res = dump_seek(file, PAGE_SIZE);
+ }
+ if (!res)
+ return false;
}
- }
-out:
- return err;
-}
-#endif
-
-/*
- * dump the segments for a NOMMU process
- */
-#ifndef CONFIG_MMU
-static int elf_fdpic_dump_segments(struct file *file, size_t *size,
- unsigned long *limit, unsigned long mm_flags)
-{
- struct vm_area_struct *vma;
-
- for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
- if (!maydump(vma, mm_flags))
- continue;
-
- if ((*size += PAGE_SIZE) > *limit)
- return -EFBIG;
-
- if (!dump_write(file, (void *) vma->vm_start,
+#else
+ if (!dump_emit(cprm, (void *) vma->vm_start,
vma->vm_end - vma->vm_start))
- return -EIO;
+ return false;
+#endif
}
-
- return 0;
+ return true;
}
-#endif
static size_t elf_core_vma_data_size(unsigned long mm_flags)
{
@@ -1755,13 +1718,10 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
offset = dataoff;
- size += sizeof(*elf);
- if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
+ if (!dump_emit(cprm, elf, sizeof(*elf)))
goto end_coredump;
- size += sizeof(*phdr4note);
- if (size > cprm->limit
- || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
+ if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
goto end_coredump;
/* write program headers for segments dump */
@@ -1785,20 +1745,18 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
phdr.p_flags |= PF_X;
phdr.p_align = ELF_EXEC_PAGESIZE;
- size += sizeof(phdr);
- if (size > cprm->limit
- || !dump_write(cprm->file, &phdr, sizeof(phdr)))
+ if (!dump_emit(cprm, &phdr, sizeof(phdr)))
goto end_coredump;
}
- cprm->written = size;
if (!elf_core_write_extra_phdrs(cprm, offset))
goto end_coredump;
size = cprm->written;
+ cprm->written = foffset;
/* write out the notes section */
for (i = 0; i < numnote; i++)
- if (!writenote(notes + i, cprm->file, &foffset))
+ if (!writenote(notes + i, cprm))
goto end_coredump;
/* write out the thread status notes section */
@@ -1807,27 +1765,22 @@ 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, &foffset))
+ if (!writenote(&tmp->notes[i], cprm))
goto end_coredump;
}
- if (!dump_seek(cprm->file, dataoff - foffset))
+ if (!dump_seek(cprm->file, dataoff - cprm->written))
goto end_coredump;
- if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,
- cprm->mm_flags) < 0)
+ cprm->written = size;
+ if (!elf_fdpic_dump_segments(cprm))
goto end_coredump;
- cprm->written = size;
if (!elf_core_write_extra_data(cprm))
goto end_coredump;
- size = cprm->written;
if (e_phnum == PN_XNUM) {
- size += sizeof(*shdr4extnum);
- if (size > cprm->limit
- || !dump_write(cprm->file, shdr4extnum,
- sizeof(*shdr4extnum)))
+ if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
goto end_coredump;
}
--
1.7.2.5
--
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