From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "dietmar.eggemann@arm.com" <dietmar.eggemann@arm.com>,
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Cc: "keescook@chromium.org" <keescook@chromium.org>,
"jannh@google.com" <jannh@google.com>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
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Subject: Re: [PATCH RFT v5 4/7] fork: Add shadow stack support to clone3()
Date: Sat, 10 Feb 2024 00:56:35 +0000 [thread overview]
Message-ID: <e8da3414f4ba9311dbde3945cb19297feb79df82.camel@intel.com> (raw)
In-Reply-To: <20240203-clone3-shadow-stack-v5-4-322c69598e4b@kernel.org>
On Sat, 2024-02-03 at 00:05 +0000, Mark Brown wrote:
> + if (args->shadow_stack) {
> + addr = args->shadow_stack;
> + size = args->shadow_stack_size;
>
> - size = adjust_shstk_size(stack_size);
> - addr = alloc_shstk(0, size, 0, false);
> - if (IS_ERR_VALUE(addr))
> - return addr;
> + /* There should be a valid token at the top of the
> stack. */
> + if (!shstk_consume_token(tsk, addr + size -
> sizeof(u64)))
> + return (unsigned long)ERR_PTR(-EINVAL);
I think for this case, it needs:
shstk->base = 0;
shstk->size = 0;
To prevent trying to free the parents shadow stack when the child
exits.
next prev parent reply other threads:[~2024-02-10 0:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-03 0:04 [PATCH RFT v5 0/7] fork: Support shadow stacks in clone3() Mark Brown
2024-02-03 0:04 ` [PATCH RFT v5 1/7] Documentation: userspace-api: Add shadow stack API documentation Mark Brown
2024-02-04 1:33 ` Randy Dunlap
2024-02-15 4:08 ` Deepak Gupta
2024-02-03 0:04 ` [PATCH RFT v5 2/7] selftests: Provide helper header for shadow stack testing Mark Brown
2024-02-09 20:24 ` Edgecombe, Rick P
2024-02-03 0:04 ` [PATCH RFT v5 3/7] mm: Introduce ARCH_HAS_USER_SHADOW_STACK Mark Brown
2024-02-09 20:21 ` Edgecombe, Rick P
2024-02-15 4:14 ` Deepak Gupta
2024-02-03 0:05 ` [PATCH RFT v5 4/7] fork: Add shadow stack support to clone3() Mark Brown
2024-02-09 20:18 ` Edgecombe, Rick P
2024-02-10 0:55 ` Edgecombe, Rick P
2024-02-12 15:38 ` Mark Brown
2024-02-10 0:56 ` Edgecombe, Rick P [this message]
2024-02-03 0:05 ` [PATCH RFT v5 5/7] selftests/clone3: Factor more of main loop into test_clone3() Mark Brown
2024-02-03 0:05 ` [PATCH RFT v5 6/7] selftests/clone3: Allow tests to flag if -E2BIG is a valid error code Mark Brown
2024-02-03 0:05 ` [PATCH RFT v5 7/7] selftests/clone3: Test shadow stack support Mark Brown
2024-02-09 20:18 ` [PATCH RFT v5 0/7] fork: Support shadow stacks in clone3() Edgecombe, Rick P
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