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* [glibc] malloc: Assure that THP mode read do write OOB end of stringt
@ 2023-04-14 11:28 Adhemerval Zanella
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From: Adhemerval Zanella @ 2023-04-14 11:28 UTC (permalink / raw)
To: glibc-cvs
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);
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