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main: fix check for writeable /proc

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fix the check for writeable /proc to use statfs instead of statvfs,
and use the unitialized statvfs structure to check for the writeable
bit.

Closes: https://github.com/containers/fuse-overlayfs/issues/397

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2023-06-07 21:22:06 +02:00
parent bcea6c940b
commit 06f8a69efa
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GPG Key ID: 67E38F7A8BA21772
1 changed files with 5 additions and 7 deletions
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12
main.c
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@ -296,25 +296,23 @@ inode_to_node (struct ovl_data *lo, ino_t n)
static void
check_writeable_proc ()
{
struct statvfs svfs;
struct statfs sfs;
struct statfs svfs;
int ret;
ret = statfs ("/proc", &sfs);
ret = statfs ("/proc", &svfs);
if (ret < 0)
{
fprintf (stderr, "error stating /proc: %m\n");
return;
}
if (sfs.f_type != PROC_SUPER_MAGIC)
if (svfs.f_type != PROC_SUPER_MAGIC)
{
fprintf (stderr, "invalid file system type found on /proc: %m\n");
fprintf (stderr, "invalid file system type found on /proc: %d, expected %d\n", svfs.f_fsid, PROC_SUPER_MAGIC);
return;
}
if (svfs.f_flag & ST_RDONLY)
if (svfs.f_flags & ST_RDONLY)
{
fprintf (stderr, "/proc seems to be mounted as readonly, it can lead to unexpected failures");
return;