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From: Adhemerval Zanella <azanella@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc] malloc: Assure that THP mode read do write OOB end of stringt
Date: Fri, 14 Apr 2023 11:28:22 +0000 (GMT)	[thread overview]
Message-ID: <20230414112822.089CE3858D20@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=05fe3ecffff485032e904f0a3ea709e24d9188eb

commit 05fe3ecffff485032e904f0a3ea709e24d9188eb
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Apr 14 08:22:40 2023 -0300

    malloc: Assure that THP mode read do write OOB end of stringt

Diff:
---
 sysdeps/unix/sysv/linux/malloc-hugepages.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/malloc-hugepages.c b/sysdeps/unix/sysv/linux/malloc-hugepages.c
index 740027ebfb..2f316474c1 100644
--- a/sysdeps/unix/sysv/linux/malloc-hugepages.c
+++ b/sysdeps/unix/sysv/linux/malloc-hugepages.c
@@ -61,6 +61,8 @@ __malloc_thp_mode (void)
 
   char str[sizeof(mode_always)];
   ssize_t s = __read_nocancel (fd, str, sizeof (str));
+  if (s >= sizeof str || s < 0)
+    return malloc_thp_mode_not_supported;
   str[s] = '\0';
   __close_nocancel (fd);

                 reply	other threads:[~2023-04-14 11:28 UTC|newest]

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