From 18470f2b4571d6779d1ee3f721d4b262349f373c Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 7 Nov 2021 17:46:37 +0100
Subject: init/tar: check length of found file

before this, you could open("/init/1") to open /init/1.txt
---
 src/init/tar.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/init/tar.c b/src/init/tar.c
index 89f4e69..1a064d6 100644
--- a/src/init/tar.c
+++ b/src/init/tar.c
@@ -64,7 +64,8 @@ static void *tar_find(const char *path, size_t path_len, void *base, size_t base
 	for (size_t off = 0; off < base_len;) {
 		if (0 != memcmp(base + off + 257, "ustar", 5))
 			break; // not a metadata sector
-		if (0 == memcmp(base + off, path, path_len))
+		if (0 == memcmp(base + off, path, path_len) &&
+				*(char*)(base + off + path_len) == '\0')
 			return base + off; // file found, quit
 
 		size = tar_size(base + off);
-- 
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