mirror of
https://github.com/PartialVolume/shredos.x86_64.git
synced 2026-02-20 17:42:10 +00:00
94 lines
2.9 KiB
Diff
94 lines
2.9 KiB
Diff
From 7a8f42fb20013a1493d8cae1c43436f85e656f2d Mon Sep 17 00:00:00 2001
|
||
From: Zephkeks <zephyrofficialdiscord@gmail.com>
|
||
Date: Tue, 13 May 2025 11:04:17 +0200
|
||
Subject: [PATCH] CVE-2025-46836: interface.c: Stack-based Buffer Overflow in
|
||
get_name()
|
||
|
||
Coordinated as GHSA-pfwf-h6m3-63wf
|
||
|
||
Upstream: https://github.com/ecki/net-tools/commit/7a8f42fb20013a1493d8cae1c43436f85e656f2d
|
||
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
|
||
---
|
||
lib/interface.c | 63 ++++++++++++++++++++++++++++++-------------------
|
||
1 file changed, 39 insertions(+), 24 deletions(-)
|
||
|
||
diff --git a/lib/interface.c b/lib/interface.c
|
||
index 71d4163..a054f12 100644
|
||
--- a/lib/interface.c
|
||
+++ b/lib/interface.c
|
||
@@ -211,32 +211,47 @@ out:
|
||
}
|
||
|
||
static const char *get_name(char *name, const char *p)
|
||
+/* Safe version — guarantees at most IFNAMSIZ‑1 bytes are copied
|
||
+ and the destination buffer is always NUL‑terminated. */
|
||
{
|
||
- while (isspace(*p))
|
||
- p++;
|
||
- while (*p) {
|
||
- if (isspace(*p))
|
||
- break;
|
||
- if (*p == ':') { /* could be an alias */
|
||
- const char *dot = p++;
|
||
- while (*p && isdigit(*p)) p++;
|
||
- if (*p == ':') {
|
||
- /* Yes it is, backup and copy it. */
|
||
- p = dot;
|
||
- *name++ = *p++;
|
||
- while (*p && isdigit(*p)) {
|
||
- *name++ = *p++;
|
||
- }
|
||
- } else {
|
||
- /* No, it isn't */
|
||
- p = dot;
|
||
- }
|
||
- p++;
|
||
- break;
|
||
- }
|
||
- *name++ = *p++;
|
||
+ char *dst = name; /* current write ptr */
|
||
+ const char *end = name + IFNAMSIZ - 1; /* last byte we may write */
|
||
+
|
||
+ /* Skip leading white‑space. */
|
||
+ while (isspace((unsigned char)*p))
|
||
+ ++p;
|
||
+
|
||
+ /* Copy until white‑space, end of string, or buffer full. */
|
||
+ while (*p && !isspace((unsigned char)*p) && dst < end) {
|
||
+ if (*p == ':') { /* possible alias veth0:123: */
|
||
+ const char *dot = p; /* remember the colon */
|
||
+ ++p;
|
||
+ while (*p && isdigit((unsigned char)*p))
|
||
+ ++p;
|
||
+
|
||
+ if (*p == ':') { /* confirmed alias */
|
||
+ p = dot; /* rewind and copy it all */
|
||
+
|
||
+ /* copy the colon */
|
||
+ if (dst < end)
|
||
+ *dst++ = *p++;
|
||
+
|
||
+ /* copy the digits */
|
||
+ while (*p && isdigit((unsigned char)*p) && dst < end)
|
||
+ *dst++ = *p++;
|
||
+
|
||
+ if (*p == ':') /* consume trailing colon */
|
||
+ ++p;
|
||
+ } else { /* if so treat as normal */
|
||
+ p = dot;
|
||
+ }
|
||
+ break; /* interface name ends here */
|
||
+ }
|
||
+
|
||
+ *dst++ = *p++; /* ordinary character copy */
|
||
}
|
||
- *name++ = '\0';
|
||
+
|
||
+ *dst = '\0'; /* always NUL‑terminate */
|
||
return p;
|
||
}
|
||
|
||
--
|
||
2.39.5
|
||
|