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..08ec506 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1749,6 +1749,50 @@ static void wait_for_dump_helpers(struct file *file)
}
+/*
+ * uhm_pipe_setup
+ * helper function to customize the process used
+ * to collect the core in userspace. Specifically
+ * it sets up a pipe and installs it as fd 0 (stdin)
+ * for the process. Returns 0 on success, or
+ * PTR_ERR on failure.
+ * Note that it also sets the core limit to 1. This
+ * is a special value that we use to trap recursive
+ * core dumps
+ */
+static int umh_pipe_setup(struct subprocess_info *info)
+{
+ struct file *rp, *wp;
+ struct fdtable *fdt;
+ struct coredump_params *cp = (struct coredump_params *)info->data;
+ struct files_struct *cf = current->files;
+
+ wp = create_write_pipe(0);
+ if (IS_ERR(wp))
+ return PTR_ERR(wp);
+
+ rp = create_read_pipe(wp, 0);
+ if (IS_ERR(rp)) {
+ free_write_pipe(wp);
+ return PTR_ERR(rp);
+ }
+
+ cp->file = wp;
+
+ sys_close(0);
+ fd_install(0, rp);
+ spin_lock(&cf->file_lock);
+ fdt = files_fdtable(cf);
+ FD_SET(0, fdt->open_fds);
+ FD_CLR(0, fdt->close_on_exec);
+ spin_unlock(&cf->file_lock);
+
+ /* and disallow core files too */
+ current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1};
+
+ return 0;
+}
+
void do_coredump(long signr, int exit_code, struct pt_regs *regs)
{
struct core_state core_state;
@@ -1756,17 +1800,20 @@ 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);
@@ -1822,19 +1869,19 @@ 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 == 1) {
/*
* 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
- * non-zero limit gets set to RLIM_INFINITY below, but
+ * cprm.limit of 1 here as a speacial value. Any
+ * non-1 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
- * if the core_pattern binary sets RLIM_CORE = !0
+ * if the core_pattern binary sets RLIM_CORE = !1
* but it runs as root, and can do lots of stupid things
* Note that we use task_tgid_vnr here to grab the pid
* of the process group leader. That way we get the
@@ -1842,7 +1889,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
* core_pattern process dies.
*/
printk(KERN_WARNING
- "Process %d(%s) has RLIMIT_CORE set to 0\n",
+ "Process %d(%s) has RLIMIT_CORE set to 1\n",
task_tgid_vnr(current), current->comm);
printk(KERN_WARNING "Aborting core\n");
goto fail_unlock;
@@ -1863,25 +1910,30 @@ 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 = NULL;
+ if (call_usermodehelper_fns(helper_argv[0], helper_argv, NULL,
+ UMH_WAIT_EXEC, umh_pipe_setup,
+ NULL, &cprm)) {
+ if (cprm.file)
+ filp_close(cprm.file, NULL);
+
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 +1946,22 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
*/
if (!ispipe && (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;
};
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index 384ca8b..ec69956 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -23,6 +23,7 @@
#include <linux/stddef.h>
#include <linux/errno.h>
#include <linux/compiler.h>
+#include <linux/workqueue.h>
#define KMOD_PATH_LEN 256
@@ -44,7 +45,26 @@ static inline int request_module_nowait(const char *name, ...) { return -ENOSYS;
struct key;
struct file;
-struct subprocess_info;
+
+enum umh_wait {
+ UMH_NO_WAIT = -1, /* don't wait at all */
+ UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
+ UMH_WAIT_PROC = 1, /* wait for the process to complete */
+};
+
+struct subprocess_info {
+ struct work_struct work;
+ struct completion *complete;
+ struct cred *cred;
+ char *path;
+ char **argv;
+ char **envp;
+ enum umh_wait wait;
+ int retval;
+ int (*init)(struct subprocess_info *info);
+ void (*cleanup)(struct subprocess_info *info);
+ void *data;
+};
/* Allocate a subprocess_info structure */
struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
@@ -55,14 +75,10 @@ void call_usermodehelper_setkeys(struct subprocess_info *info,
struct key *session_keyring);
int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
struct file **filp);
-void call_usermodehelper_setcleanup(struct subprocess_info *info,
- void (*cleanup)(char **argv, char **envp));
-
-enum umh_wait {
- UMH_NO_WAIT = -1, /* don't wait at all */
- UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
- UMH_WAIT_PROC = 1, /* wait for the process to complete */
-};
+void call_usermodehelper_setfns(struct subprocess_info *info,
+ int (*init)(struct subprocess_info *info),
+ void (*cleanup)(struct subprocess_info *info),
+ void *data);
/* Actually execute the sub-process */
int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
@@ -72,7 +88,10 @@ int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
void call_usermodehelper_freeinfo(struct subprocess_info *info);
static inline int
-call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
+call_usermodehelper_fns(char *path, char **argv, char **envp,
+ enum umh_wait wait,
+ int (*init)(struct subprocess_info *info),
+ void (*cleanup)(struct subprocess_info *), void *data)
{
struct subprocess_info *info;
gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
@@ -80,10 +99,18 @@ call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
if (info == NULL)
return -ENOMEM;
+ call_usermodehelper_setfns(info, init, cleanup, data);
return call_usermodehelper_exec(info, wait);
}
static inline int
+call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
+{
+ return call_usermodehelper_fns(path, argv, envp,
+ wait, NULL, NULL, NULL);
+}
+
+static inline int
call_usermodehelper_keys(char *path, char **argv, char **envp,
struct key *session_keyring, enum umh_wait wait)
{
@@ -100,10 +127,6 @@ call_usermodehelper_keys(char *path, char **argv, char **envp,
extern void usermodehelper_init(void);
-struct file;
-extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
- struct file **filp);
-
extern int usermodehelper_disable(void);
extern void usermodehelper_enable(void);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 9fcb53a..7281229 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -124,19 +124,6 @@ int __request_module(bool wait, const char *fmt, ...)
EXPORT_SYMBOL(__request_module);
#endif /* CONFIG_MODULES */
-struct subprocess_info {
- struct work_struct work;
- struct completion *complete;
- struct cred *cred;
- char *path;
- char **argv;
- char **envp;
- enum umh_wait wait;
- int retval;
- struct file *stdin;
- void (*cleanup)(char **argv, char **envp);
-};
-
/*
* This is the task which runs the usermode application
*/
@@ -158,26 +145,15 @@ static int ____call_usermodehelper(void *data)
commit_creds(sub_info->cred);
sub_info->cred = NULL;
- /* Install input pipe when needed */
- if (sub_info->stdin) {
- struct files_struct *f = current->files;
- struct fdtable *fdt;
- /* no races because files should be private here */
- sys_close(0);
- fd_install(0, sub_info->stdin);
- spin_lock(&f->file_lock);
- fdt = files_fdtable(f);
- FD_SET(0, fdt->open_fds);
- FD_CLR(0, fdt->close_on_exec);
- spin_unlock(&f->file_lock);
-
- /* and disallow core files too */
- current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
- }
-
/* We can run anywhere, unlike our parent keventd(). */
set_cpus_allowed_ptr(current, cpu_all_mask);
+ if (sub_info->init) {
+ retval = sub_info->init(sub_info);
+ if (retval)
+ goto fail;
+ }
+
/*
* Our parent is keventd, which runs with elevated scheduling priority.
* Avoid propagating that into the userspace child.
@@ -187,6 +163,7 @@ static int ____call_usermodehelper(void *data)
retval = kernel_execve(sub_info->path, sub_info->argv, sub_info->envp);
/* Exec failed? */
+fail:
sub_info->retval = retval;
do_exit(0);
}
@@ -194,7 +171,7 @@ static int ____call_usermodehelper(void *data)
void call_usermodehelper_freeinfo(struct subprocess_info *info)
{
if (info->cleanup)
- (*info->cleanup)(info->argv, info->envp);
+ (*info->cleanup)(info);
if (info->cred)
put_cred(info->cred);
kfree(info);
@@ -406,50 +383,31 @@ void call_usermodehelper_setkeys(struct subprocess_info *info,
EXPORT_SYMBOL(call_usermodehelper_setkeys);
/**
- * call_usermodehelper_setcleanup - set a cleanup function
+ * call_usermodehelper_setfns - set a cleanup/init function
* @info: a subprocess_info returned by call_usermodehelper_setup
* @cleanup: a cleanup function
+ * @init: an init function
+ * @data: arbitrary context sensitive data
+ *
+ * The init function is used to customize the helper process prior to
+ * exec. A non-zero return code causes the process to error out, exit,
+ * and return the failure to the calling process
*
- * The cleanup function is just befor ethe subprocess_info is about to
+ * The cleanup function is just before ethe subprocess_info is about to
* be freed. This can be used for freeing the argv and envp. The
* Function must be runnable in either a process context or the
* context in which call_usermodehelper_exec is called.
*/
-void call_usermodehelper_setcleanup(struct subprocess_info *info,
- void (*cleanup)(char **argv, char **envp))
+void call_usermodehelper_setfns(struct subprocess_info *info,
+ int (*init)(struct subprocess_info *info),
+ void (*cleanup)(struct subprocess_info *info),
+ void *data)
{
info->cleanup = cleanup;
+ info->init = init;
+ info->data = data;
}
-EXPORT_SYMBOL(call_usermodehelper_setcleanup);
-
-/**
- * call_usermodehelper_stdinpipe - set up a pipe to be used for stdin
- * @sub_info: a subprocess_info returned by call_usermodehelper_setup
- * @filp: set to the write-end of a pipe
- *
- * This constructs a pipe, and sets the read end to be the stdin of the
- * subprocess, and returns the write-end in *@filp.
- */
-int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
- struct file **filp)
-{
- struct file *f;
-
- f = create_write_pipe(0);
- if (IS_ERR(f))
- return PTR_ERR(f);
- *filp = f;
-
- f = create_read_pipe(f, 0);
- if (IS_ERR(f)) {
- free_write_pipe(*filp);
- return PTR_ERR(f);
- }
- sub_info->stdin = f;
-
- return 0;
-}
-EXPORT_SYMBOL(call_usermodehelper_stdinpipe);
+EXPORT_SYMBOL(call_usermodehelper_setfns);
/**
* call_usermodehelper_exec - start a usermode application
@@ -498,39 +456,6 @@ unlock:
}
EXPORT_SYMBOL(call_usermodehelper_exec);
-/**
- * call_usermodehelper_pipe - call a usermode helper process with a pipe stdin
- * @path: path to usermode executable
- * @argv: arg vector for process
- * @envp: environment for process
- * @filp: set to the write-end of a pipe
- *
- * This is a simple wrapper which executes a usermode-helper function
- * with a pipe as stdin. It is implemented entirely in terms of
- * lower-level call_usermodehelper_* functions.
- */
-int call_usermodehelper_pipe(char *path, char **argv, char **envp,
- struct file **filp)
-{
- struct subprocess_info *sub_info;
- int ret;
-
- sub_info = call_usermodehelper_setup(path, argv, envp, GFP_KERNEL);
- if (sub_info == NULL)
- return -ENOMEM;
-
- ret = call_usermodehelper_stdinpipe(sub_info, filp);
- if (ret < 0)
- goto out;
-
- return call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
-
- out:
- call_usermodehelper_freeinfo(sub_info);
- return ret;
-}
-EXPORT_SYMBOL(call_usermodehelper_pipe);
-
void __init usermodehelper_init(void)
{
khelper_wq = create_singlethread_workqueue("khelper");
diff --git a/kernel/sys.c b/kernel/sys.c
index ce17760..0b8a55e 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1600,9 +1600,9 @@ SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
-static void argv_cleanup(char **argv, char **envp)
+static void argv_cleanup(struct subprocess_info *info)
{
- argv_free(argv);
+ argv_free(info->argv);
}
/**
@@ -1636,7 +1636,7 @@ int orderly_poweroff(bool force)
goto out;
}
- call_usermodehelper_setcleanup(info, argv_cleanup);
+ call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL);
ret = call_usermodehelper_exec(info, UMH_NO_WAIT);