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rt: fix shm_open not set ENAMETOOLONG when name exceeds {_POSIX_PATH_MAX}
according to man-pages-posix-2017, shm_open() function may fail if the length of the name argument exceeds {_POSIX_PATH_MAX} and set ENAMETOOLONG Signed-off-by: abushwang <abushwangs@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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@ -25,6 +25,7 @@
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#include <string.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <errno.h>
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int
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__shm_get_name (struct shmdir_name *result, const char *name, bool sem_prefix)
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@ -54,9 +55,14 @@ __shm_get_name (struct shmdir_name *result, const char *name, bool sem_prefix)
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if (sem_prefix)
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alloc_buffer_copy_bytes (&buffer, "sem.", strlen ("sem."));
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alloc_buffer_copy_bytes (&buffer, name, namelen + 1);
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if (namelen == 0 || memchr (name, '/', namelen) != NULL
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|| alloc_buffer_has_failed (&buffer))
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return -1;
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if (namelen == 0 || memchr (name, '/', namelen) != NULL)
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return EINVAL;
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if (alloc_buffer_has_failed (&buffer))
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{
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if (namelen > NAME_MAX)
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return ENAMETOOLONG;
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return EINVAL;
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}
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return 0;
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}
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libc_hidden_def (__shm_get_name)
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@ -30,9 +30,10 @@ int
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__shm_open (const char *name, int oflag, mode_t mode)
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{
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struct shmdir_name dirname;
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if (__shm_get_name (&dirname, name, false) != 0)
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int ret =__shm_get_name (&dirname, name, false);
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if (ret != 0)
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{
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__set_errno (EINVAL);
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__set_errno (ret);
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return -1;
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}
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@ -47,9 +47,10 @@ __sem_open (const char *name, int oflag, ...)
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}
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struct shmdir_name dirname;
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if (__shm_get_name (&dirname, name, true) != 0)
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int ret = __shm_get_name (&dirname, name, true);
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if (ret != 0)
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{
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__set_errno (EINVAL);
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__set_errno (ret);
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return SEM_FAILED;
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}
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