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From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Adhemerval Zanella via Glibc-cvs <glibc-cvs@sourceware.org>,
	Adhemerval Zanella <azanella@sourceware.org>
Subject: Re: [glibc] malloc: Assure that THP mode is always null terminated
Date: Fri, 14 Apr 2023 08:02:07 -0300	[thread overview]
Message-ID: <AD76C6CB-A977-445F-852D-6F95973F2C6E@linaro.org> (raw)
In-Reply-To: <87fs93lzuj.fsf@linux-m68k.org>



> On 14 Apr 2023, at 03:52, Andreas Schwab <schwab@linux-m68k.org> wrote:
> 
> On Apr 13 2023, Adhemerval Zanella via Glibc-cvs wrote:
> 
>> diff --git a/sysdeps/unix/sysv/linux/malloc-hugepages.c b/sysdeps/unix/sysv/linux/malloc-hugepages.c
>> index 683d68c327..740027ebfb 100644
>> --- a/sysdeps/unix/sysv/linux/malloc-hugepages.c
>> +++ b/sysdeps/unix/sysv/linux/malloc-hugepages.c
>> @@ -61,6 +61,7 @@ __malloc_thp_mode (void)
>> 
>>   char str[sizeof(mode_always)];
>>   ssize_t s = __read_nocancel (fd, str, sizeof (str));
>> +  str[s] = '\0';
> 
> This is a buffer overflow if s >= sizeof (str) or s < 0.

Indeed, thanks for catching it. I will fix it.

      reply	other threads:[~2023-04-14 11:02 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-13 20:18 Adhemerval Zanella
2023-04-14  6:52 ` Andreas Schwab
2023-04-14 11:02   ` Adhemerval Zanella [this message]

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