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fs/semaphore/sem_open: update the logic when the semaphore name length is greater than PATH_MAX or a component length is greater than NAME_MAX.

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Follow the POSIX specification in https://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_open.html, update the logic for condition that the semaphore name length is greater than PATH_MAX or a component length is greater than NAME_MAX.

Signed-off-by: yangjiao <yangjiao@xiaomi.com>
This commit is contained in:
yangjiao 2023-06-16 17:35:07 +08:00 committed by Xiang Xiao
parent afec562fbb
commit c2e1aa281d
1 changed files with 15 additions and 0 deletions
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15
fs/semaphore/sem_open.c
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@ -103,6 +103,21 @@ FAR sem_t *sem_open(FAR const char *name, int oflags, ...)
DEBUGASSERT(name != NULL);
if (name[0] == '/')
{
if (strlen(name) >= PATH_MAX)
{
set_errno(ENAMETOOLONG);
return SEM_FAILED;
}
if (strlen(strrchr(name, '/') + 1) >= NAME_MAX)
{
set_errno(ENAMETOOLONG);
return SEM_FAILED;
}
}
/* The POSIX specification requires that the "check for the existence
* of a semaphore and the creation of the semaphore if it does not
* exist shall be atomic with respect to other processes executing