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switch elf_coredump_extra_notes_write() to dump_emit()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-05 22:24:29 -04:00
parent e6c1baa9b5
commit cdc3d5627d
6 changed files with 30 additions and 38 deletions
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3
arch/powerpc/include/asm/spu.h
View File

@ -235,6 +235,7 @@ extern long spu_sys_callback(struct spu_syscall_block *s);
/* syscalls implemented in spufs */
struct file;
struct coredump_params;
struct spufs_calls {
long (*create_thread)(const char __user *name,
unsigned int flags, umode_t mode,
@ -242,7 +243,7 @@ struct spufs_calls {
long (*spu_run)(struct file *filp, __u32 __user *unpc,
__u32 __user *ustatus);
int (*coredump_extra_notes_size)(void);
int (*coredump_extra_notes_write)(struct file *file, loff_t *foffset);
int (*coredump_extra_notes_write)(struct coredump_params *cprm);
void (*notify_spus_active)(void);
struct module *owner;
};

5
arch/powerpc/platforms/cell/spu_syscalls.c
View File

@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/rcupdate.h>
#include <linux/binfmts.h>
#include <asm/spu.h>
@ -126,7 +127,7 @@ int elf_coredump_extra_notes_size(void)
return ret;
}
int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset)
int elf_coredump_extra_notes_write(struct coredump_params *cprm)
{
struct spufs_calls *calls;
int ret;
@ -135,7 +136,7 @@ int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset)
if (!calls)
return 0;
ret = calls->coredump_extra_notes_write(file, foffset);
ret = calls->coredump_extra_notes_write(cprm);
spufs_calls_put(calls);

44
arch/powerpc/platforms/cell/spufs/coredump.c
View File

@ -27,6 +27,8 @@
#include <linux/gfp.h>
#include <linux/list.h>
#include <linux/syscalls.h>
#include <linux/coredump.h>
#include <linux/binfmts.h>
#include <asm/uaccess.h>
@ -52,35 +54,24 @@ static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
* These are the only things you should do on a core-file: use only these
* functions to write out all the necessary info.
*/
static int spufs_dump_write(struct file *file, const void *addr, int nr, loff_t *foffset)
static int spufs_dump_write(struct coredump_params *cprm, const void *addr, int nr)
{
unsigned long limit = rlimit(RLIMIT_CORE);
ssize_t written;
if (*foffset + nr > limit)
if (!dump_emit(cprm, addr, nr))
return -EIO;
written = file->f_op->write(file, addr, nr, &file->f_pos);
*foffset += written;
if (written != nr)
return -EIO;
return 0;
}
static int spufs_dump_align(struct file *file, char *buf, loff_t new_off,
loff_t *foffset)
static int spufs_dump_align(struct coredump_params *cprm, char *buf, loff_t new_off)
{
int rc, size;
size = min((loff_t)PAGE_SIZE, new_off - *foffset);
size = min((loff_t)PAGE_SIZE, new_off - cprm->written);
memset(buf, 0, size);
rc = 0;
while (rc == 0 && new_off > *foffset) {
size = min((loff_t)PAGE_SIZE, new_off - *foffset);
rc = spufs_dump_write(file, buf, size, foffset);
while (rc == 0 && new_off > cprm->written) {
size = min((loff_t)PAGE_SIZE, new_off - cprm->written);
rc = spufs_dump_write(cprm, buf, size);
}
return rc;
@ -165,7 +156,7 @@ int spufs_coredump_extra_notes_size(void)
}
static int spufs_arch_write_note(struct spu_context *ctx, int i,
struct file *file, int dfd, loff_t *foffset)
struct coredump_params *cprm, int dfd)
{
loff_t pos = 0;
int sz, rc, nread, total = 0;
@ -186,22 +177,22 @@ static int spufs_arch_write_note(struct spu_context *ctx, int i,
en.n_descsz = sz;
en.n_type = NT_SPU;
rc = spufs_dump_write(file, &en, sizeof(en), foffset);
rc = spufs_dump_write(cprm, &en, sizeof(en));
if (rc)
goto out;
rc = spufs_dump_write(file, fullname, en.n_namesz, foffset);
rc = spufs_dump_write(cprm, fullname, en.n_namesz);
if (rc)
goto out;
rc = spufs_dump_align(file, buf, roundup(*foffset, 4), foffset);
rc = spufs_dump_align(cprm, buf, roundup(cprm->written, 4));
if (rc)
goto out;
do {
nread = do_coredump_read(i, ctx, buf, bufsz, &pos);
if (nread > 0) {
rc = spufs_dump_write(file, buf, nread, foffset);
rc = spufs_dump_write(cprm, buf, nread);
if (rc)
goto out;
total += nread;
@ -213,15 +204,14 @@ static int spufs_arch_write_note(struct spu_context *ctx, int i,
goto out;
}
rc = spufs_dump_align(file, buf, roundup(*foffset - total + sz, 4),
foffset);
rc = spufs_dump_align(cprm, buf, roundup(cprm->written - total + sz, 4));
out:
free_page((unsigned long)buf);
return rc;
}
int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset)
int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
{
struct spu_context *ctx;
int fd, j, rc;
@ -233,7 +223,7 @@ int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset)
return rc;
for (j = 0; spufs_coredump_read[j].name != NULL; j++) {
rc = spufs_arch_write_note(ctx, j, file, fd, foffset);
rc = spufs_arch_write_note(ctx, j, cprm, fd);
if (rc) {
spu_release_saved(ctx);
return rc;

3
arch/powerpc/platforms/cell/spufs/spufs.h
View File

@ -247,12 +247,13 @@ extern const struct spufs_tree_descr spufs_dir_debug_contents[];
/* system call implementation */
extern struct spufs_calls spufs_calls;
struct coredump_params;
long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
long spufs_create(struct path *nd, struct dentry *dentry, unsigned int flags,
umode_t mode, struct file *filp);
/* ELF coredump callbacks for writing SPU ELF notes */
extern int spufs_coredump_extra_notes_size(void);
extern int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset);
extern int spufs_coredump_extra_notes_write(struct coredump_params *cprm);
extern const struct file_operations spufs_context_fops;

7
fs/binfmt_elf.c
View File

@ -2037,7 +2037,7 @@ static int elf_core_dump(struct coredump_params *cprm)
size_t size = 0;
struct vm_area_struct *vma, *gate_vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff, foffset;
loff_t offset = 0, dataoff;
struct elf_note_info info = { };
struct elf_phdr *phdr4note = NULL;
struct elf_shdr *shdr4extnum = NULL;
@ -2160,12 +2160,11 @@ static int elf_core_dump(struct coredump_params *cprm)
if (!write_note_info(&info, cprm))
goto end_coredump;
foffset = cprm->written;
if (elf_coredump_extra_notes_write(cprm->file, &foffset))
if (elf_coredump_extra_notes_write(cprm))
goto end_coredump;
/* Align to page */
if (!dump_seek(cprm->file, dataoff - foffset))
if (!dump_seek(cprm->file, dataoff - cprm->written))
goto end_coredump;
cprm->written = size;

6
include/linux/elf.h
View File

@ -39,13 +39,13 @@ extern Elf64_Dyn _DYNAMIC [];
/* Optional callbacks to write extra ELF notes. */
struct file;
struct coredump_params;
#ifndef ARCH_HAVE_EXTRA_ELF_NOTES
static inline int elf_coredump_extra_notes_size(void) { return 0; }
static inline int elf_coredump_extra_notes_write(struct file *file,
loff_t *foffset) { return 0; }
static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
#else
extern int elf_coredump_extra_notes_size(void);
extern int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset);
extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
#endif
#endif /* _LINUX_ELF_H */