musl - musl - an implementation of the standard library for Linux-based systems

musl - an implementation of the standard library for Linux-based systems

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author	Rich Felker <dalias@aerifal.cx>	2019年06月28日 17:58:03 -0400
committer	Rich Felker <dalias@aerifal.cx>	2019年06月28日 17:58:03 -0400
commit	3d178a7e2b75066593fbd5705742c5808395d90d (patch)
tree	da5f36fbd4c0508a62eca103c77bf2db7b15e15b /src/linux/getdents.c
parent	54b7564b72c1edcc79fca083047521fb56eaea00 (diff)
download	musl-3d178a7e2b75066593fbd5705742c5808395d90d.tar.gz

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.

Diffstat (limited to 'src/linux/getdents.c')

-rw-r--r--

src/linux/getdents.c

1 files changed, 2 insertions, 0 deletions

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);

}

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