diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2025-03-18 01:58:27 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2025-03-18 01:58:40 +0100 |
| commit | c180703603f314ef83c39aae5a15c83c72918a64 (patch) | |
| tree | 1370d75389fc7ad1f4d9807734625ec342443206 | |
| parent | f5eb71362af4104f6c0e3bdae9e2a89159094016 (diff) | |
ext2fs: Do not try to frob inline data for regular files and directories
Inline data in i_data is only used by symlinks (and apparently some
device nodes in linux). For regular files and directories we don't store
data there. This is actually important since otherwise
int fd = open("foo.txt", O_WRONLY|O_CREAT);
ftruncate(fd, 1024);
ftruncate(fd, 10);
leads to trying to frob beyond i_data end.
| -rw-r--r-- | ext2fs/truncate.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/ext2fs/truncate.c b/ext2fs/truncate.c index 44aab3c7..aa3a5a60 100644 --- a/ext2fs/truncate.c +++ b/ext2fs/truncate.c @@ -291,7 +291,9 @@ diskfs_truncate (struct node *node, off_t length) if (length >= node->dn_stat.st_size) return 0; - if (! node->dn_stat.st_blocks) + if (! node->dn_stat.st_blocks + && !S_ISREG (node->dn_stat.st_mode) + && !S_ISDIR (node->dn_stat.st_mode)) /* There aren't really any blocks allocated, so just frob the size. This is true for fast symlinks, and also apparently for some device nodes in linux. */ |