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Date: Sun, 29 Nov 2009 10:10:07 -0500
From: Masami Hiramatsu <mhiramat@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu
CC: Oleg Nesterov <oleg@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
LKML <linux-kernel@...r.kernel.org>, dhowells@...hat.com,
hidehiro.kawai.ez@...achi.com, lethal@...ux-sh.org,
roland@...hat.com, vapier@...too.org,
Takahiro Yasui <tyasui@...hat.com>
Subject: [PATCH][RFC] tracepoint: signal coredump (Re: [PATCH v2] mm: Introduce
coredump parameter structure)
Hi Ingo and Andrew,
By the way, I'd like to push signal_coredump tracepoint (which I attached)
on these patches, and it also depends on signal-tracepoint patch series
which already picked up to -tip tree.
So, in this case, is it possible to pick these patches (coredump parameter
and mm->flags consistency fix (http://patchwork.kernel.org/patch/60917/))
to -tip tree too?
Thank you,
Masami Hiramatsu wrote:
> Introduce coredump parameter data structure (struct coredump_params)
> for simplifying binfmt->core_dump() arguments.
>
> Changes in v2:
> - Don't remove DUMP_WRITE() macro.
>
> Signed-off-by: Masami Hiramatsu<mhiramat@...hat.com>
> Suggested-by: Ingo Molnar<mingo@...e.hu>
> Cc: Hidehiro Kawai<hidehiro.kawai.ez@...achi.com>
> Cc: Andrew Morton<akpm@...ux-foundation.org>
> Cc: Oleg Nesterov<oleg@...hat.com>
> Cc: Roland McGrath<roland@...hat.com>
> Cc: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> ---
>
> Andrew, please replace the previous buggy patch with this version.
>
> Thank you,
>
> fs/binfmt_aout.c | 13 +++++++------
> fs/binfmt_elf.c | 24 +++++++++++++-----------
> fs/binfmt_elf_fdpic.c | 29 +++++++++++++++--------------
> fs/binfmt_flat.c | 6 +++---
> fs/binfmt_som.c | 2 +-
> fs/exec.c | 38 +++++++++++++++++++++-----------------
> include/linux/binfmts.h | 10 +++++++++-
> 7 files changed, 69 insertions(+), 53 deletions(-)
>
>
> diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
> index b639dcf..346b694 100644
> --- a/fs/binfmt_aout.c
> +++ b/fs/binfmt_aout.c
> @@ -32,7 +32,7 @@
>
> static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
> static int load_aout_library(struct file*);
> -static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
> +static int aout_core_dump(struct coredump_params *cprm);
>
> static struct linux_binfmt aout_format = {
> .module = THIS_MODULE,
> @@ -89,8 +89,9 @@ if (file->f_op->llseek) { \
> * dumping of the process results in another error..
> */
>
> -static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
> +static int aout_core_dump(struct coredump_params *cprm)
> {
> + struct file *file = cprm->file;
> mm_segment_t fs;
> int has_dumped = 0;
> unsigned long dump_start, dump_size;
> @@ -108,16 +109,16 @@ static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, u
> current->flags |= PF_DUMPCORE;
> strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
> dump.u_ar0 = offsetof(struct user, regs);
> - dump.signal = signr;
> - aout_dump_thread(regs,&dump);
> + dump.signal = cprm->signr;
> + aout_dump_thread(cprm->regs,&dump);
>
> /* If the size of the dump file exceeds the rlimit, then see what would happen
> if we wrote the stack, but not the data area. */
> - if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE> limit)
> + if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE> cprm->limit)
> dump.u_dsize = 0;
>
> /* Make sure we have enough room to write the stack and data areas. */
> - if ((dump.u_ssize + 1) * PAGE_SIZE> limit)
> + if ((dump.u_ssize + 1) * PAGE_SIZE> cprm->limit)
> dump.u_ssize = 0;
>
> /* make sure we actually have a data and stack area to dump */
> diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
> index b9b3bb5..4ee5bb2 100644
> --- a/fs/binfmt_elf.c
> +++ b/fs/binfmt_elf.c
> @@ -45,7 +45,7 @@ static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
> * don't even try.
> */
> #if defined(USE_ELF_CORE_DUMP)&& defined(CONFIG_ELF_CORE)
> -static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
> +static int elf_core_dump(struct coredump_params *cprm);
> #else
> #define elf_core_dump NULL
> #endif
> @@ -1277,8 +1277,9 @@ static int writenote(struct memelfnote *men, struct file *file,
> }
> #undef DUMP_WRITE
>
> -#define DUMP_WRITE(addr, nr) \
> - if ((size += (nr))> limit || !dump_write(file, (addr), (nr))) \
> +#define DUMP_WRITE(addr, nr) \
> + if ((size += (nr))> cprm->limit || \
> + !dump_write(cprm->file, (addr), (nr))) \
> goto end_coredump;
>
> static void fill_elf_header(struct elfhdr *elf, int segs,
> @@ -1906,7 +1907,7 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
> * and then they are actually written out. If we run out of core limit
> * we just truncate.
> */
> -static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
> +static int elf_core_dump(struct coredump_params *cprm)
> {
> int has_dumped = 0;
> mm_segment_t fs;
> @@ -1952,7 +1953,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
> * notes. This also sets up the file header.
> */
> if (!fill_note_info(elf, segs + 1, /* including notes section */
> - &info, signr, regs))
> + &info, cprm->signr, cprm->regs))
> goto cleanup;
>
> has_dumped = 1;
> @@ -2014,14 +2015,14 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
> #endif
>
> /* write out the notes section */
> - if (!write_note_info(&info, file,&foffset))
> + if (!write_note_info(&info, cprm->file,&foffset))
> goto end_coredump;
>
> - if (elf_coredump_extra_notes_write(file,&foffset))
> + if (elf_coredump_extra_notes_write(cprm->file,&foffset))
> goto end_coredump;
>
> /* Align to page */
> - if (!dump_seek(file, dataoff - foffset))
> + if (!dump_seek(cprm->file, dataoff - foffset))
> goto end_coredump;
>
> for (vma = first_vma(current, gate_vma); vma != NULL;
> @@ -2038,12 +2039,13 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
> page = get_dump_page(addr);
> if (page) {
> void *kaddr = kmap(page);
> - stop = ((size += PAGE_SIZE)> limit) ||
> - !dump_write(file, kaddr, PAGE_SIZE);
> + stop = ((size += PAGE_SIZE)> cprm->limit) ||
> + !dump_write(cprm->file, kaddr,
> + PAGE_SIZE);
> kunmap(page);
> page_cache_release(page);
> } else
> - stop = !dump_seek(file, PAGE_SIZE);
> + stop = !dump_seek(cprm->file, PAGE_SIZE);
> if (stop)
> goto end_coredump;
> }
> diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
> index 38502c6..917e1b4 100644
> --- a/fs/binfmt_elf_fdpic.c
> +++ b/fs/binfmt_elf_fdpic.c
> @@ -76,7 +76,7 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
> struct file *, struct mm_struct *);
>
> #if defined(USE_ELF_CORE_DUMP)&& defined(CONFIG_ELF_CORE)
> -static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit);
> +static int elf_fdpic_core_dump(struct coredump_params *cprm);
> #endif
>
> static struct linux_binfmt elf_fdpic_format = {
> @@ -1325,8 +1325,9 @@ static int writenote(struct memelfnote *men, struct file *file)
> #undef DUMP_WRITE
> #undef DUMP_SEEK
>
> -#define DUMP_WRITE(addr, nr) \
> - if ((size += (nr))> limit || !dump_write(file, (addr), (nr))) \
> +#define DUMP_WRITE(addr, nr) \
> + if ((size += (nr))> cprm->limit || \
> + !dump_write(cprm->file, (addr), (nr))) \
> goto end_coredump;
>
> static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
> @@ -1581,8 +1582,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
> * and then they are actually written out. If we run out of core limit
> * we just truncate.
> */
> -static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
> - struct file *file, unsigned long limit)
> +static int elf_fdpic_core_dump(struct coredump_params *cprm)
> {
> #define NUM_NOTES 6
> int has_dumped = 0;
> @@ -1641,7 +1641,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
> goto cleanup;
> #endif
>
> - if (signr) {
> + if (cprm->signr) {
> struct core_thread *ct;
> struct elf_thread_status *tmp;
>
> @@ -1660,14 +1660,14 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
> int sz;
>
> tmp = list_entry(t, struct elf_thread_status, list);
> - sz = elf_dump_thread_status(signr, tmp);
> + sz = elf_dump_thread_status(cprm->signr, tmp);
> thread_status_size += sz;
> }
> }
>
> /* now collect the dump for the current */
> - fill_prstatus(prstatus, current, signr);
> - elf_core_copy_regs(&prstatus->pr_reg, regs);
> + fill_prstatus(prstatus, current, cprm->signr);
> + elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
>
> segs = current->mm->map_count;
> #ifdef ELF_CORE_EXTRA_PHDRS
> @@ -1702,7 +1702,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
>
> /* Try to dump the FPU. */
> if ((prstatus->pr_fpvalid =
> - elf_core_copy_task_fpregs(current, regs, fpu)))
> + elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
> fill_note(notes + numnote++,
> "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
> #ifdef ELF_CORE_COPY_XFPREGS
> @@ -1773,7 +1773,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
>
> /* write out the notes section */
> for (i = 0; i< numnote; i++)
> - if (!writenote(notes + i, file))
> + if (!writenote(notes + i, cprm->file))
> goto end_coredump;
>
> /* write out the thread status notes section */
> @@ -1782,14 +1782,15 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
> list_entry(t, struct elf_thread_status, list);
>
> for (i = 0; i< tmp->num_notes; i++)
> - if (!writenote(&tmp->notes[i], file))
> + if (!writenote(&tmp->notes[i], cprm->file))
> goto end_coredump;
> }
>
> - if (!dump_seek(file, dataoff))
> + if (!dump_seek(cprm->file, dataoff))
> goto end_coredump;
>
> - if (elf_fdpic_dump_segments(file,&size,&limit, mm_flags)< 0)
> + if (elf_fdpic_dump_segments(cprm->file,&size,&cprm->limit,
> + mm_flags)< 0)
> goto end_coredump;
>
> #ifdef ELF_CORE_WRITE_EXTRA_DATA
> diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
> index a279665..d4a00ea 100644
> --- a/fs/binfmt_flat.c
> +++ b/fs/binfmt_flat.c
> @@ -87,7 +87,7 @@ static int load_flat_shared_library(int id, struct lib_info *p);
> #endif
>
> static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs);
> -static int flat_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
> +static int flat_core_dump(struct coredump_params *cprm);
>
> static struct linux_binfmt flat_format = {
> .module = THIS_MODULE,
> @@ -102,10 +102,10 @@ static struct linux_binfmt flat_format = {
> * Currently only a stub-function.
> */
>
> -static int flat_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
> +static int flat_core_dump(struct coredump_params *cprm)
> {
> printk("Process %s:%d received signr %d and should have core dumped\n",
> - current->comm, current->pid, (int) signr);
> + current->comm, current->pid, (int) cprm->signr);
> return(1);
> }
>
> diff --git a/fs/binfmt_som.c b/fs/binfmt_som.c
> index eff74b9..2a9b533 100644
> --- a/fs/binfmt_som.c
> +++ b/fs/binfmt_som.c
> @@ -43,7 +43,7 @@ static int load_som_library(struct file *);
> * don't even try.
> */
> #if 0
> -static int som_core_dump(long signr, struct pt_regs *regs, unsigned long limit);
> +static int som_core_dump(struct coredump_params *cprm);
> #else
> #define som_core_dump NULL
> #endif
> diff --git a/fs/exec.c b/fs/exec.c
> index ba112bd..5daf7d5 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1756,17 +1756,20 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> struct mm_struct *mm = current->mm;
> struct linux_binfmt * binfmt;
> struct inode * inode;
> - struct file * file;
> const struct cred *old_cred;
> struct cred *cred;
> int retval = 0;
> int flag = 0;
> int ispipe = 0;
> - unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
> char **helper_argv = NULL;
> int helper_argc = 0;
> int dump_count = 0;
> static atomic_t core_dump_count = ATOMIC_INIT(0);
> + struct coredump_params cprm = {
> + .signr = signr,
> + .regs = regs,
> + .limit = current->signal->rlim[RLIMIT_CORE].rlim_cur,
> + };
>
> audit_core_dumps(signr);
>
> @@ -1822,15 +1825,15 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> ispipe = format_corename(corename, signr);
> unlock_kernel();
>
> - if ((!ispipe)&& (core_limit< binfmt->min_coredump))
> + if ((!ispipe)&& (cprm.limit< binfmt->min_coredump))
> goto fail_unlock;
>
> if (ispipe) {
> - if (core_limit == 0) {
> + if (cprm.limit == 0) {
> /*
> * Normally core limits are irrelevant to pipes, since
> * we're not writing to the file system, but we use
> - * core_limit of 0 here as a speacial value. Any
> + * cprm.limit of 0 here as a speacial value. Any
> * non-zero limit gets set to RLIM_INFINITY below, but
> * a limit of 0 skips the dump. This is a consistent
> * way to catch recursive crashes. We can still crash
> @@ -1863,25 +1866,25 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> goto fail_dropcount;
> }
>
> - core_limit = RLIM_INFINITY;
> + cprm.limit = RLIM_INFINITY;
>
> /* SIGPIPE can happen, but it's just never processed */
> if (call_usermodehelper_pipe(helper_argv[0], helper_argv, NULL,
> - &file)) {
> + &cprm.file)) {
> printk(KERN_INFO "Core dump to %s pipe failed\n",
> corename);
> goto fail_dropcount;
> }
> } else
> - file = filp_open(corename,
> + cprm.file = filp_open(corename,
> O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
> 0600);
> - if (IS_ERR(file))
> + if (IS_ERR(cprm.file))
> goto fail_dropcount;
> - inode = file->f_path.dentry->d_inode;
> + inode = cprm.file->f_path.dentry->d_inode;
> if (inode->i_nlink> 1)
> goto close_fail; /* multiple links - don't dump */
> - if (!ispipe&& d_unhashed(file->f_path.dentry))
> + if (!ispipe&& d_unhashed(cprm.file->f_path.dentry))
> goto close_fail;
>
> /* AK: actually i see no reason to not allow this for named pipes etc.,
> @@ -1894,21 +1897,22 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
> */
> if (inode->i_uid != current_fsuid())
> goto close_fail;
> - if (!file->f_op)
> + if (!cprm.file->f_op)
> goto close_fail;
> - if (!file->f_op->write)
> + if (!cprm.file->f_op->write)
> goto close_fail;
> - if (!ispipe&& do_truncate(file->f_path.dentry, 0, 0, file) != 0)
> + if (!ispipe&&
> + do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file) != 0)
> goto close_fail;
>
> - retval = binfmt->core_dump(signr, regs, file, core_limit);
> + retval = binfmt->core_dump(&cprm);
>
> if (retval)
> current->signal->group_exit_code |= 0x80;
> close_fail:
> if (ispipe&& core_pipe_limit)
> - wait_for_dump_helpers(file);
> - filp_close(file, NULL);
> + wait_for_dump_helpers(cprm.file);
> + filp_close(cprm.file, NULL);
> fail_dropcount:
> if (dump_count)
> atomic_dec(&core_dump_count);
> diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
> index aece486..cd4349b 100644
> --- a/include/linux/binfmts.h
> +++ b/include/linux/binfmts.h
> @@ -68,6 +68,14 @@ struct linux_binprm{
>
> #define BINPRM_MAX_RECURSION 4
>
> +/* Function parameter for binfmt->coredump */
> +struct coredump_params {
> + long signr;
> + struct pt_regs *regs;
> + struct file *file;
> + unsigned long limit;
> +};
> +
> /*
> * This structure defines the functions that are used to load the binary formats that
> * linux accepts.
> @@ -77,7 +85,7 @@ struct linux_binfmt {
> struct module *module;
> int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
> int (*load_shlib)(struct file *);
> - int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
> + int (*core_dump)(struct coredump_params *cprm);
> unsigned long min_coredump; /* minimal dump size */
> int hasvdso;
> };
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@...hat.com
View attachment "tp-signal-coredump.patch" of type "text/plain" (4956 bytes)
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