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verify that ttyname refers to the same file as the fd

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linux containers use separate mount namespace so the /proc
symlink might not point to the right device if the fd was
opened in the parent namespace, in this case return ENOENT.
This commit is contained in:
Szabolcs Nagy 2016-08-20 21:04:31 +02:00 committed by Rich Felker
parent 2b41959b59
commit 0a950dcf15
1 changed files with 11 additions and 4 deletions
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15
src/unistd/ttyname_r.c
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@ -1,10 +1,12 @@
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
void __procfdname(char *, unsigned);
int ttyname_r(int fd, char *name, size_t size)
{
struct stat st1, st2;
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
ssize_t l;
@ -15,8 +17,13 @@ int ttyname_r(int fd, char *name, size_t size)
if (l < 0) return errno;
else if (l == size) return ERANGE;
else {
name[l] = 0;
return 0;
}
name[l] = 0;
if (stat(name, &st1) || fstat(fd, &st2))
return errno;
if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
return ENOENT;
return 0;
}