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um: Fix incorrect assumptions about max pid length 

pids are no longer limited to 16-bits, bump to 32-bits,
ie. 9 decimal characters.  Additionally sizeof("/") already
returns 2 - ie. it already accounts for trailing zero.

Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Linux UM Mailing List <linux-um@lists.infradead.org>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Maciej Żenczykowski 2020-08-07 12:32:26 -07:00 committed by Richard Weinberger
parent 4687615d2d
commit e8a58591af
1 changed files with 4 additions and 4 deletions
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8
arch/um/os-Linux/umid.c
View File

@ -97,7 +97,7 @@ static int remove_files_and_dir(char *dir)
while ((ent = readdir(directory)) != NULL) {
if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
continue;
len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
len = strlen(dir) + strlen("/") + strlen(ent->d_name) + 1;
if (len > sizeof(file)) {
ret = -E2BIG;
goto out;
@ -135,7 +135,7 @@ out:
*/
static inline int is_umdir_used(char *dir)
{
char pid[sizeof("nnnnn\0")], *end, *file;
char pid[sizeof("nnnnnnnnn")], *end, *file;
int dead, fd, p, n, err;
size_t filelen;
@ -217,10 +217,10 @@ static int umdir_take_if_dead(char *dir)
static void __init create_pid_file(void)
{
char pid[sizeof("nnnnn\0")], *file;
char pid[sizeof("nnnnnnnnn")], *file;
int fd, n;
n = strlen(uml_dir) + UMID_LEN + sizeof("/pid\0");
n = strlen(uml_dir) + UMID_LEN + sizeof("/pid");
file = malloc(n);
if (!file)
return;