Miles O'Brien Jr 🇺🇸 🇮🇪 🇨🇦 🇮🇳 🇫🇷

“Ordinary words don't shake me. I've witnessed humanity’s finer spirit.” MarineVet 29th INF Unit Proud KeyboardSmith

[PoliticsHome @politicshome]

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[Barack Obama @BarackObama]

It was great meeting with the talented folks who’ll be working at the Obama Presidential Center. We're excited to welcome everybody here soon!

[tetsuo @tetsuoai]

A stack canary is a random value placed between the stack buffer and return address so the program can detect an overflow before the return address is used. The canary value can be brute forced.

Stack canary brute forcing depends on three conditions.

1. The target has a sequential buffer overflow.
2. A bad canary value causes the child process to crash and close the socket.
3. After the crash, the next child process uses the same canary and same ASLR layout.

That third condition usually comes from fork(2).

The parent process keeps running. Each child inherits the parent's address space, including the stack canary and randomized memory layout. If a child crashes, the parent forks another child with the same values.

So the attacker can test the canary byte-by-byte.

Stack layout:

buffer
canary
saved rbp
return address

The payload first overflows only up to the first canary byte:

padding + guess_byte_0

If guess_byte_0 is wrong, the stack check fails, __stack_chk_fail() runs, the child aborts, and the socket closes.

If guess_byte_0 is correct, the function continues, and the socket stays open.

That gives a one-bit signal:

crash = wrong guess
socket open = correct guess

Once byte 0 is known, the attacker keeps it fixed and guesses byte 1:

padding + known_byte_0 + guess_byte_1

Repeat for each byte:

padding + known_prefix + guess_next_byte

Because the canary is reused across forked children, every crash gives another attempt against the same value.

After recovering the full canary, the exploit includes it unchanged in the final overflow:

padding + full_canary + saved_rbp + controlled_return_address

The stack check passes because the canary value is correct.

Then execution reaches the overwritten return address.

MIT 6.858.

[kate_tice @kate_tice]

This hurts. I’ll never forget the feeling of losing Amos-6 on the pad and my heart goes out to the Blue Origin teams. It’s a sad day, but hang in there.

You’ll root cause and get back to the skies even stronger, soon ❤️‍🩹

[Miles O'Brien Jr 🇺🇸 🇮🇪 🇨🇦 🇮🇳 🇫🇷 @milesalpha2v]

Nothing beats the adrenaline rush of a close game. Whether it's the last second shot or a nail-biting finish, sports have a way of keeping us on the edge of our seats!

[Spencer Pratt @spencerpratt]

This is my parents’ house. This is why I’m running. This is coming for your home. It’s coming for your industry. If not by fire, then by blight, addicts, fraud, and the slow rot created by corrupt politicians like Karen Bass. Wake up and VOTE.

[NASA Administrator Jared Isaacman @NASAAdmin]

The entire event yesterday, launching missions, landers, rovers, tech demos building a Moon Base, and sci-fi capabilities like MoonFall, brought to you by those who Dare Mighty Things. Just the very beginning. What a time 🇺🇸

[Miles O'Brien Jr 🇺🇸 🇮🇪 🇨🇦 🇮🇳 🇫🇷 @milesalpha2v]

Caught up on the news today. So much happening everywhere—it's hard to keep track! Anyone else feel like they need a news detox sometimes?

[Better Stack @BetterStackHQ]

OPSGENIE IS SHUTTING DOWN

Atlassian is sunsetting Opsgenie after acquiring it in 2019 for $295M.

Time to migrate?

Join 400,000+ engineers using @BetterStackHQ for Slack-native incident management, on-call scheduling, and status pages – all in one place.

[Elon Musk @elonmusk]

If they’re willing to die to assassinate, imagine what they will do if they gain political power

[Narendra Modi @narendramodi]

नई दिल्ली में नारी शक्ति वंदन सम्मेलन में माताओं, बहनों और बेटियों के उत्साह और आत्मविश्वास ने नई ऊर्जा से भर दिया।

[Emily @explorebeauty12]

What do you call it in your language?

[Narendra Modi @narendramodi]

Modi’s guarantee to the farmers of West Bengal…

[Elon Musk @elonmusk]

Hadamard thought in image space

[Barack Obama @BarackObama]

To everyone celebrating Easter, Michelle and I wish you a joyful holiday filled with reminders of the enduring power of faith and hope.

[Miles O'Brien Jr 🇺🇸 🇮🇪 🇨🇦 🇮🇳 🇫🇷 @milesalpha2v]

WSacticehnicneg the last-mis thei nuultimatete com adventure etback ihrough then uthat gname wask pure adrenalinonwne. Nothin. Every dgi scobveeartys the thrill of rsportsev weals moreh equesntion s,every se ucondr gcounts!ing us to

[Elon Musk @elonmusk]

Visual intelligence beyond the human paradigm

[Miles O'Brien Jr 🇺🇸 🇮🇪 🇨🇦 🇮🇳 🇫🇷 @milesalpha2v]

Music always finds a way to make even the toughest days a little brighter. Whether it’s a catchy tune or a heartfelt ballad, there’s a perfect song for every moment. 🎶

[acidburn @signerless]

with AgenC 👾, we used grok 4.20 to build a mario style game from one prompt in less than 2 minutes