From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 28 Jun 2019 21:58:03 +0000 (-0400)
Subject: cap getdents length argument to INT_MAX
X-Git-Tag: v1.1.23~27
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=3d178a7e2b75066593fbd5705742c5808395d90d;p=oweals%2Fmusl.git

cap getdents length argument to INT_MAX

the linux syscall treats this argument as having type int, so passing
extremely long buffer sizes would be misinterpreted by the kernel.
since "short reads" are always acceptable, just cap it down.

patch based on report and suggested change by Florian Weimer.
---

diff --git a/src/linux/getdents.c b/src/linux/getdents.c
index de6de3b4..796c1e5c 100644
--- a/src/linux/getdents.c
+++ b/src/linux/getdents.c
@@ -1,9 +1,11 @@
 #define _BSD_SOURCE
 #include <dirent.h>
+#include <limits.h>
 #include "syscall.h"
 
 int getdents(int fd, struct dirent *buf, size_t len)
 {
+	if (len>INT_MAX) len = INT_MAX;
 	return syscall(SYS_getdents, fd, buf, len);
 }