update libc argv patch
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066a91bd31
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@ -85,7 +85,7 @@ index 150640ddf3..e511897600 100644
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DUMMY(int , -1, getpriority, (int, int))
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DUMMY(int , -1, getrusage, (int, rusage *))
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DUMMY_SILENT(uid_t , 0, getuid, (void))
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From 01bac4b0add9da8bbb4fcbe339605533ab7e7be5 Mon Sep 17 00:00:00 2001
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From 73a27bd29a3dddc9cad8fbbc6303dd09776e5bdb Mon Sep 17 00:00:00 2001
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From: Emery Hemingway <ehmry@posteo.net>
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Date: Thu, 26 Nov 2020 12:47:30 +0100
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Subject: [PATCH] libc: always set argv and envp to valid arrays
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@ -93,16 +93,15 @@ MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The argument array passed to main(…) must be a null terminated array, even
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if argc is zero. Set at least one environment variable in any case.
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The arrays passed to main(…) must always be valid null-terminated arrays.
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Fix #3955
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---
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repos/libports/include/libc/args.h | 29 +++++++++++++++++++++++++----
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1 file changed, 25 insertions(+), 4 deletions(-)
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repos/libports/include/libc/args.h | 19 +++++++++++++++----
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1 file changed, 15 insertions(+), 4 deletions(-)
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diff --git a/repos/libports/include/libc/args.h b/repos/libports/include/libc/args.h
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index 76645d82cb..fab299b8d3 100644
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index 76645d82cb..ca9a8fd38a 100644
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--- a/repos/libports/include/libc/args.h
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+++ b/repos/libports/include/libc/args.h
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@@ -25,6 +25,7 @@ static void populate_args_and_env(Libc::Env &env, int &argc, char **&argv, char
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@ -113,7 +112,7 @@ index 76645d82cb..fab299b8d3 100644
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env.config([&] (Xml_node const &node) {
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@@ -40,12 +41,25 @@ static void populate_args_and_env(Libc::Env &env, int &argc, char **&argv, char
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@@ -40,12 +41,20 @@ static void populate_args_and_env(Libc::Env &env, int &argc, char **&argv, char
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++envc;
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});
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@ -121,13 +120,8 @@ index 76645d82cb..fab299b8d3 100644
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+ if (argc == 0 && envc == 0) {
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+ /*
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+ * If argc is zero then argv is still a NULL-terminated array.
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+ *
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+ * Invent an enviromental variable in case the application
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+ * does not handle an empty environment. SHLVL=0 is
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+ * just an indication that this application lacks a parent
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+ * shell.
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+ */
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+ static char const *args[] = { nullptr, "SHLVL=0", nullptr };
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+ static char const *args[] = { nullptr, nullptr };
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+ argc = 0;
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+ argv = (char**)&args;
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+ envp = &argv[1];
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@ -138,22 +132,17 @@ index 76645d82cb..fab299b8d3 100644
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- argv = (char**)malloc((argc + envc + 1) * sizeof(char*));
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- envp = &argv[argc];
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+ /* arguments and environment are arranged System V style (but don't count on it) */
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+ argv = (char**)malloc((argc + max(envc, 1) + 2) * sizeof(char*));
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+ argv = (char**)malloc((argc + envc + 2) * sizeof(char*));
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+ envp = &argv[argc+1];
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/* read the arguments */
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int arg_i = 0;
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@@ -123,6 +137,13 @@ static void populate_args_and_env(Libc::Env &env, int &argc, char **&argv, char
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@@ -123,6 +132,8 @@ static void populate_args_and_env(Libc::Env &env, int &argc, char **&argv, char
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catch (Xml_node::Nonexistent_attribute) { }
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});
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+ /* argv and envp are both NULL terminated */
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+
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+ argv[arg_i] = NULL;
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+
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+ /* invent an env-var if none are present, see note above */
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+ if (env_i == 0)
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+ envp[env_i++] = (char*)"SHLVL=0";
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envp[env_i] = NULL;
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});
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}
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