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dump_skip(): dump_seek() replacement taking coredump_params

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-08 09:26:08 -04:00
parent 2507a4fbd4
commit 9b56d54380
6 changed files with 22 additions and 43 deletions
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2
arch/x86/ia32/ia32_aout.c
View File

@ -187,7 +187,7 @@ static int aout_core_dump(struct coredump_params *cprm)
if (!dump_emit(cprm, &dump, sizeof(dump)))
goto end_coredump;
/* Now dump all of the user data. Include malloced stuff as well */
if (!dump_seek(cprm->file, PAGE_SIZE - sizeof(dump)))
if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
goto end_coredump;
/* now we start writing out the user space info */
set_fs(USER_DS);

2
fs/binfmt_aout.c
View File

@ -87,7 +87,7 @@ static int aout_core_dump(struct coredump_params *cprm)
if (!dump_emit(cprm, &dump, sizeof(dump)))
goto end_coredump;
/* Now dump all of the user data. Include malloced stuff as well */
if (!dump_seek(cprm->file, PAGE_SIZE - sizeof(dump)))
if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
goto end_coredump;
/* now we start writing out the user space info */
set_fs(USER_DS);

4
fs/binfmt_elf.c
View File

@ -2162,7 +2162,7 @@ static int elf_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* Align to page */
if (!dump_seek(cprm->file, dataoff - cprm->written))
if (!dump_skip(cprm, dataoff - cprm->written))
goto end_coredump;
for (vma = first_vma(current, gate_vma); vma != NULL;
@ -2183,7 +2183,7 @@ static int elf_core_dump(struct coredump_params *cprm)
kunmap(page);
page_cache_release(page);
} else
stop = !dump_seek(cprm->file, PAGE_SIZE);
stop = !dump_skip(cprm, PAGE_SIZE);
if (stop)
goto end_coredump;
}

11
fs/binfmt_elf_fdpic.c
View File

@ -1509,7 +1509,7 @@ static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
kunmap(page);
page_cache_release(page);
} else {
res = dump_seek(file, PAGE_SIZE);
res = dump_skip(cprm, PAGE_SIZE);
}
if (!res)
return false;
@ -1547,11 +1547,10 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
int has_dumped = 0;
mm_segment_t fs;
int segs;
size_t size = 0;
int i;
struct vm_area_struct *vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff, foffset;
loff_t offset = 0, dataoff;
int numnote;
struct memelfnote *notes = NULL;
struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
@ -1682,7 +1681,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
offset += sizeof(*elf); /* Elf header */
offset += segs * sizeof(struct elf_phdr); /* Program headers */
foffset = offset;
/* Write notes phdr entry */
{
@ -1751,8 +1749,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
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))
@ -1768,10 +1764,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
}
if (!dump_seek(cprm->file, dataoff - cprm->written))
if (!dump_skip(cprm, dataoff - cprm->written))
goto end_coredump;
cprm->written = size;
if (!elf_fdpic_dump_segments(cprm))
goto end_coredump;

43
fs/coredump.c
View File

@ -685,14 +685,6 @@ fail:
* do on a core-file: use only these functions to write out all the
* necessary info.
*/
int dump_write(struct file *file, const void *addr, int nr)
{
return !dump_interrupted() &&
access_ok(VERIFY_READ, addr, nr) &&
file->f_op->write(file, addr, nr, &file->f_pos) == nr;
}
EXPORT_SYMBOL(dump_write);
int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
{
struct file *file = cprm->file;
@ -714,32 +706,25 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
}
EXPORT_SYMBOL(dump_emit);
int dump_seek(struct file *file, loff_t off)
int dump_skip(struct coredump_params *cprm, size_t nr)
{
int ret = 1;
static char zeroes[PAGE_SIZE];
struct file *file = cprm->file;
if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
if (cprm->written + nr > cprm->limit)
return 0;
if (dump_interrupted() ||
file->f_op->llseek(file, off, SEEK_CUR) < 0)
file->f_op->llseek(file, nr, SEEK_CUR) < 0)
return 0;
cprm->written += nr;
return 1;
} else {
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)) {
ret = 0;
break;
}
off -= n;
while (nr > PAGE_SIZE) {
if (!dump_emit(cprm, zeroes, PAGE_SIZE))
return 0;
nr -= PAGE_SIZE;
}
free_page((unsigned long)buf);
return dump_emit(cprm, zeroes, nr);
}
return ret;
}
EXPORT_SYMBOL(dump_seek);
EXPORT_SYMBOL(dump_skip);

3
include/linux/coredump.h
View File

@ -11,8 +11,7 @@
* functions to write out all the necessary info.
*/
struct coredump_params;
extern int dump_write(struct file *file, const void *addr, int nr);
extern int dump_seek(struct file *file, loff_t off);
extern int dump_skip(struct coredump_params *cprm, size_t nr);
extern int dump_emit(struct coredump_params *cprm, const void *addr, int nr);
#ifdef CONFIG_COREDUMP
extern void do_coredump(siginfo_t *siginfo);