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Date: Wed, 09 Oct 2013 01:15:57 +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 11/13] dump_skip(): dump_seek() replacement taking
coredump_params
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
arch/x86/ia32/ia32_aout.c | 2 +-
fs/binfmt_aout.c | 2 +-
fs/binfmt_elf.c | 4 ++--
fs/binfmt_elf_fdpic.c | 11 +++--------
fs/coredump.c | 43 ++++++++++++++-----------------------------
include/linux/coredump.h | 3 +--
6 files changed, 22 insertions(+), 43 deletions(-)
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 9e26e9e..d21ff89 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -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);
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index a4f847f..ca0ba15 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -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);
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 42ef312..da33c1d 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -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;
}
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 1806e25..723fa02 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1510,7 +1510,7 @@ 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;
@@ -1548,11 +1548,10 @@ 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 */
@@ -1683,7 +1682,6 @@ 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 */
{
@@ -1752,8 +1750,6 @@ 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))
@@ -1769,10 +1765,9 @@ 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->file, dataoff - cprm->written))
goto end_coredump;
- cprm->written = size;
if (!elf_fdpic_dump_segments(cprm))
goto end_coredump;
diff --git a/fs/coredump.c b/fs/coredump.c
index 478ebad..489372e 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -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);
diff --git a/include/linux/coredump.h b/include/linux/coredump.h
index 2959376..07a0af9 100644
--- a/include/linux/coredump.h
+++ b/include/linux/coredump.h
@@ -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);
--
1.7.2.5
--
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