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stat() before open() because opening of special files may be harmful.

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bde 1996-03-29 12:55:54 +00:00
parent 3e694fd3e8
commit 19d4cb63d2
1 changed files with 10 additions and 0 deletions
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10
lib/libc/gen/opendir.c
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@ -56,6 +56,16 @@ opendir(name)
int saved_errno;
struct stat sb;
/*
* stat() before open() because opening of special files may be
* harmful. fstat() after open because the file may have changed.
*/
if (stat(name, &sb) != 0)
return NULL;
if (!S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
return NULL;
}
if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1)
return NULL;
dirp = NULL;