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[elf-fdpic] coredump: don't bother with cyclic list for per-thread objects 

plain single-linked list is just fine here...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-15 10:19:31 -04:00
parent 7a896028ad
commit 5074c7f69f
1 changed files with 11 additions and 18 deletions
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29
fs/binfmt_elf_fdpic.c
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@ -1453,7 +1453,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status
{
struct list_head list;
struct elf_thread_status *next;
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
@ -1578,8 +1578,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
struct memelfnote *notes = NULL;
struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
LIST_HEAD(thread_list);
struct list_head *t;
struct elf_thread_status *thread_list = NULL;
elf_fpregset_t *fpu = NULL;
int thread_status_size = 0;
elf_addr_t *auxv;
@ -1627,15 +1626,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
tmp->thread = ct->task;
list_add(&tmp->list, &thread_list);
tmp->next = thread_list;
thread_list = tmp;
}
list_for_each(t, &thread_list) {
struct elf_thread_status *tmp;
int sz;
tmp = list_entry(t, struct elf_thread_status, list);
sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
for (tmp = thread_list; tmp; tmp = tmp->next) {
int sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
thread_status_size += sz;
}
@ -1760,10 +1756,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* write out the thread status notes section */
list_for_each(t, &thread_list) {
struct elf_thread_status *tmp =
list_entry(t, struct elf_thread_status, list);
for (tmp = thread_list; tmp; tmp = tmp->next) {
for (i = 0; i < tmp->num_notes; i++)
if (!writenote(&tmp->notes[i], cprm))
goto end_coredump;
@ -1791,10 +1784,10 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
}
end_coredump:
while (!list_empty(&thread_list)) {
struct list_head *tmp = thread_list.next;
list_del(tmp);
kfree(list_entry(tmp, struct elf_thread_status, list));
while (thread_list) {
tmp = thread_list;
thread_list = thread_list->next;
kfree(tmp);
}
kfree(phdr4note);
kfree(elf);