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Message-ID: <d115a20889d01bc7b12dbd8cf99aad0be58cbc97.camel@linux.ibm.com>
Date: Thu, 21 Nov 2024 15:34:47 -0500
From: Mimi Zohar <zohar@...ux.ibm.com>
To: Mickaël Salaün <mic@...ikod.net>,
Al Viro
<viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Kees
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Cc: Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
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Subject: Re: [PATCH v21 6/6] samples/check-exec: Add an enlighten "inc"
interpreter and 28 tests
Hi Mickaël,
On Tue, 2024-11-12 at 20:18 +0100, Mickaël Salaün wrote:
>
> +
> +/* Returns 1 on error, 0 otherwise. */
> +static int interpret_stream(FILE *script, char *const script_name,
> + char *const *const envp, const bool restrict_stream)
> +{
> + int err;
> + char *const script_argv[] = { script_name, NULL };
> + char buf[128] = {};
> + size_t buf_size = sizeof(buf);
> +
> + /*
> + * We pass a valid argv and envp to the kernel to emulate a native
> + * script execution. We must use the script file descriptor instead of
> + * the script path name to avoid race conditions.
> + */
> + err = execveat(fileno(script), "", script_argv, envp,
> + AT_EMPTY_PATH | AT_EXECVE_CHECK);
At least with v20, the AT_CHECK always was being set, independent of whether
set-exec.c set it. I'll re-test with v21.
thanks,
Mimi
> + if (err && restrict_stream) {
> + perror("ERROR: Script execution check");
> + return 1;
> + }
> +
> + /* Reads script. */
> + buf_size = fread(buf, 1, buf_size - 1, script);
> + return interpret_buffer(buf, buf_size);
> +}
> +
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