mirror of
https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
![Deskin Miller](/assets/img/avatar_default.png)
As the testcase demonstrates, it's possible for split_cmdline to return -1 and deallocate any memory it's allocated, if the config string is missing an end quote. In both the cases below, which are the only calling sites, the return isn't checked, and using the pointer causes a pretty immediate segfault. Signed-off-by: Deskin Miller <deskinm@umich.edu> Acked-by: Miklos Vajna <vmiklos@frugalware.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
512 lines
14 KiB
C
512 lines
14 KiB
C
#include "builtin.h"
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#include "exec_cmd.h"
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#include "cache.h"
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#include "quote.h"
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const char git_usage_string[] =
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"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
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const char git_more_info_string[] =
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"See 'git help COMMAND' for more information on a specific command.";
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static int use_pager = -1;
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struct pager_config {
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const char *cmd;
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int val;
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};
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static int pager_command_config(const char *var, const char *value, void *data)
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{
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struct pager_config *c = data;
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if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
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c->val = git_config_bool(var, value);
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return 0;
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}
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/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
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int check_pager_config(const char *cmd)
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{
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struct pager_config c;
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c.cmd = cmd;
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c.val = -1;
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git_config(pager_command_config, &c);
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return c.val;
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}
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static void commit_pager_choice(void) {
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switch (use_pager) {
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case 0:
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setenv("GIT_PAGER", "cat", 1);
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break;
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case 1:
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setup_pager();
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break;
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default:
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break;
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}
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}
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static int handle_options(const char*** argv, int* argc, int* envchanged)
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{
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int handled = 0;
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
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break;
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/*
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* Check remaining flags.
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*/
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if (!prefixcmp(cmd, "--exec-path")) {
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cmd += 11;
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if (*cmd == '=')
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git_set_argv_exec_path(cmd + 1);
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else {
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puts(git_exec_path());
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exit(0);
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}
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} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
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use_pager = 1;
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} else if (!strcmp(cmd, "--no-pager")) {
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use_pager = 0;
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--git-dir")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --git-dir.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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handled++;
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} else if (!prefixcmp(cmd, "--git-dir=")) {
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setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--work-tree")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --work-tree.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (!prefixcmp(cmd, "--work-tree=")) {
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setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--bare")) {
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static char git_dir[PATH_MAX+1];
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is_bare_repository_cfg = 1;
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setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
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if (envchanged)
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*envchanged = 1;
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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usage(git_usage_string);
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}
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(*argv)++;
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(*argc)--;
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handled++;
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}
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return handled;
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}
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static int handle_alias(int *argcp, const char ***argv)
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{
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int envchanged = 0, ret = 0, saved_errno = errno;
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const char *subdir;
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int count, option_count;
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const char** new_argv;
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const char *alias_command;
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char *alias_string;
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int unused_nongit;
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subdir = setup_git_directory_gently(&unused_nongit);
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alias_command = (*argv)[0];
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alias_string = alias_lookup(alias_command);
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if (alias_string) {
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if (alias_string[0] == '!') {
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if (*argcp > 1) {
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struct strbuf buf;
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strbuf_init(&buf, PATH_MAX);
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strbuf_addstr(&buf, alias_string);
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sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
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free(alias_string);
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alias_string = buf.buf;
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}
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trace_printf("trace: alias to shell cmd: %s => %s\n",
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alias_command, alias_string + 1);
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ret = system(alias_string + 1);
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if (ret >= 0 && WIFEXITED(ret) &&
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WEXITSTATUS(ret) != 127)
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exit(WEXITSTATUS(ret));
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die("Failed to run '%s' when expanding alias '%s'\n",
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alias_string + 1, alias_command);
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}
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count = split_cmdline(alias_string, &new_argv);
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if (count < 0)
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die("Bad alias.%s string", alias_command);
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option_count = handle_options(&new_argv, &count, &envchanged);
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if (envchanged)
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die("alias '%s' changes environment variables\n"
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"You can use '!git' in the alias to do this.",
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alias_command);
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memmove(new_argv - option_count, new_argv,
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count * sizeof(char *));
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new_argv -= option_count;
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if (count < 1)
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die("empty alias for %s", alias_command);
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if (!strcmp(alias_command, new_argv[0]))
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die("recursive alias: %s", alias_command);
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trace_argv_printf(new_argv,
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"trace: alias expansion: %s =>",
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alias_command);
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new_argv = xrealloc(new_argv, sizeof(char*) *
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(count + *argcp + 1));
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/* insert after command name */
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memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
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new_argv[count+*argcp] = NULL;
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*argv = new_argv;
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*argcp += count - 1;
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ret = 1;
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}
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if (subdir)
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chdir(subdir);
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errno = saved_errno;
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return ret;
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}
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const char git_version_string[] = GIT_VERSION;
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#define RUN_SETUP (1<<0)
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#define USE_PAGER (1<<1)
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/*
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* require working tree to be present -- anything uses this needs
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* RUN_SETUP for reading from the configuration file.
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*/
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#define NEED_WORK_TREE (1<<2)
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struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, const char *);
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int option;
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};
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static int run_command(struct cmd_struct *p, int argc, const char **argv)
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{
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int status;
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struct stat st;
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const char *prefix;
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prefix = NULL;
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if (p->option & RUN_SETUP)
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prefix = setup_git_directory();
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if (use_pager == -1 && p->option & RUN_SETUP)
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use_pager = check_pager_config(p->cmd);
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if (use_pager == -1 && p->option & USE_PAGER)
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use_pager = 1;
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commit_pager_choice();
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if (p->option & NEED_WORK_TREE)
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setup_work_tree();
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trace_argv_printf(argv, "trace: built-in: git");
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status = p->fn(argc, argv, prefix);
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if (status)
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return status & 0xff;
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/* Somebody closed stdout? */
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if (fstat(fileno(stdout), &st))
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return 0;
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/* Ignore write errors for pipes and sockets.. */
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if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
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return 0;
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/* Check for ENOSPC and EIO errors.. */
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if (fflush(stdout))
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die("write failure on standard output: %s", strerror(errno));
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if (ferror(stdout))
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die("unknown write failure on standard output");
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if (fclose(stdout))
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die("close failed on standard output: %s", strerror(errno));
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return 0;
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}
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static void handle_internal_command(int argc, const char **argv)
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{
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const char *cmd = argv[0];
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static struct cmd_struct commands[] = {
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{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
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{ "annotate", cmd_annotate, RUN_SETUP },
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{ "apply", cmd_apply },
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{ "archive", cmd_archive },
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{ "blame", cmd_blame, RUN_SETUP },
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{ "branch", cmd_branch, RUN_SETUP },
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{ "bundle", cmd_bundle },
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{ "cat-file", cmd_cat_file, RUN_SETUP },
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{ "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
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{ "checkout-index", cmd_checkout_index,
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RUN_SETUP | NEED_WORK_TREE},
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{ "check-ref-format", cmd_check_ref_format },
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{ "check-attr", cmd_check_attr, RUN_SETUP },
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{ "cherry", cmd_cherry, RUN_SETUP },
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{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
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{ "clone", cmd_clone },
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{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
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{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
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{ "commit-tree", cmd_commit_tree, RUN_SETUP },
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{ "config", cmd_config },
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{ "count-objects", cmd_count_objects, RUN_SETUP },
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{ "describe", cmd_describe, RUN_SETUP },
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{ "diff", cmd_diff },
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{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
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{ "diff-index", cmd_diff_index, RUN_SETUP },
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{ "diff-tree", cmd_diff_tree, RUN_SETUP },
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{ "fast-export", cmd_fast_export, RUN_SETUP },
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{ "fetch", cmd_fetch, RUN_SETUP },
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{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
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{ "fetch--tool", cmd_fetch__tool, RUN_SETUP },
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{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
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{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
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{ "format-patch", cmd_format_patch, RUN_SETUP },
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{ "fsck", cmd_fsck, RUN_SETUP },
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{ "fsck-objects", cmd_fsck, RUN_SETUP },
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{ "gc", cmd_gc, RUN_SETUP },
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{ "get-tar-commit-id", cmd_get_tar_commit_id },
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{ "grep", cmd_grep, RUN_SETUP | USE_PAGER },
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{ "help", cmd_help },
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#ifndef NO_CURL
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{ "http-fetch", cmd_http_fetch, RUN_SETUP },
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#endif
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{ "init", cmd_init_db },
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{ "init-db", cmd_init_db },
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{ "log", cmd_log, RUN_SETUP | USE_PAGER },
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{ "ls-files", cmd_ls_files, RUN_SETUP },
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{ "ls-tree", cmd_ls_tree, RUN_SETUP },
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{ "ls-remote", cmd_ls_remote },
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{ "mailinfo", cmd_mailinfo },
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{ "mailsplit", cmd_mailsplit },
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{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
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{ "merge-base", cmd_merge_base, RUN_SETUP },
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{ "merge-file", cmd_merge_file },
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{ "merge-ours", cmd_merge_ours, RUN_SETUP },
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{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
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{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
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{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
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{ "name-rev", cmd_name_rev, RUN_SETUP },
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{ "pack-objects", cmd_pack_objects, RUN_SETUP },
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{ "peek-remote", cmd_ls_remote },
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{ "pickaxe", cmd_blame, RUN_SETUP },
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{ "prune", cmd_prune, RUN_SETUP },
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{ "prune-packed", cmd_prune_packed, RUN_SETUP },
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{ "push", cmd_push, RUN_SETUP },
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{ "read-tree", cmd_read_tree, RUN_SETUP },
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{ "reflog", cmd_reflog, RUN_SETUP },
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{ "remote", cmd_remote, RUN_SETUP },
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{ "repo-config", cmd_config },
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{ "rerere", cmd_rerere, RUN_SETUP },
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{ "reset", cmd_reset, RUN_SETUP },
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{ "rev-list", cmd_rev_list, RUN_SETUP },
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{ "rev-parse", cmd_rev_parse },
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{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
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{ "rm", cmd_rm, RUN_SETUP },
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{ "send-pack", cmd_send_pack, RUN_SETUP },
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{ "shortlog", cmd_shortlog, USE_PAGER },
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{ "show-branch", cmd_show_branch, RUN_SETUP },
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{ "show", cmd_show, RUN_SETUP | USE_PAGER },
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{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
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{ "stripspace", cmd_stripspace },
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{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
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{ "tag", cmd_tag, RUN_SETUP },
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{ "tar-tree", cmd_tar_tree },
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{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
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{ "update-index", cmd_update_index, RUN_SETUP },
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{ "update-ref", cmd_update_ref, RUN_SETUP },
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{ "upload-archive", cmd_upload_archive },
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{ "verify-tag", cmd_verify_tag, RUN_SETUP },
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{ "version", cmd_version },
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{ "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
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{ "write-tree", cmd_write_tree, RUN_SETUP },
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{ "verify-pack", cmd_verify_pack },
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{ "show-ref", cmd_show_ref, RUN_SETUP },
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{ "pack-refs", cmd_pack_refs, RUN_SETUP },
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};
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int i;
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static const char ext[] = STRIP_EXTENSION;
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if (sizeof(ext) > 1) {
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i = strlen(argv[0]) - strlen(ext);
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if (i > 0 && !strcmp(argv[0] + i, ext)) {
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char *argv0 = strdup(argv[0]);
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argv[0] = cmd = argv0;
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argv0[i] = '\0';
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}
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}
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/* Turn "git cmd --help" into "git help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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if (strcmp(p->cmd, cmd))
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continue;
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exit(run_command(p, argc, argv));
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}
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}
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static void execv_dashed_external(const char **argv)
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{
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struct strbuf cmd;
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const char *tmp;
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strbuf_init(&cmd, 0);
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strbuf_addf(&cmd, "git-%s", argv[0]);
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/*
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* argv[0] must be the git command, but the argv array
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* belongs to the caller, and may be reused in
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* subsequent loop iterations. Save argv[0] and
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* restore it on error.
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*/
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tmp = argv[0];
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argv[0] = cmd.buf;
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trace_argv_printf(argv, "trace: exec:");
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/* execvp() can only ever return if it fails */
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execvp(cmd.buf, (char **)argv);
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trace_printf("trace: exec failed: %s\n", strerror(errno));
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argv[0] = tmp;
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strbuf_release(&cmd);
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}
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int main(int argc, const char **argv)
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{
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const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help";
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char *slash = (char *)cmd + strlen(cmd);
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int done_alias = 0;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if we don't have anything better.
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*/
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do
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--slash;
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while (cmd <= slash && !is_dir_sep(*slash));
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if (cmd <= slash) {
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*slash++ = 0;
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git_set_argv0_path(cmd);
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!prefixcmp(cmd, "git-")) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv);
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die("cannot handle %s internally", cmd);
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}
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/* Look for flags.. */
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argv++;
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argc--;
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handle_options(&argv, &argc, NULL);
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commit_pager_choice();
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if (argc > 0) {
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if (!prefixcmp(argv[0], "--"))
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argv[0] += 2;
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} else {
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/* The user didn't specify a command; give them help */
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printf("usage: %s\n\n", git_usage_string);
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list_common_cmds_help();
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printf("\n%s\n", git_more_info_string);
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exit(1);
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}
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cmd = argv[0];
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|
|
|
/*
|
|
* We use PATH to find git commands, but we prepend some higher
|
|
* precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
|
|
* environment, and the $(gitexecdir) from the Makefile at build
|
|
* time.
|
|
*/
|
|
setup_path();
|
|
|
|
while (1) {
|
|
/* See if it's an internal command */
|
|
handle_internal_command(argc, argv);
|
|
|
|
/* .. then try the external ones */
|
|
execv_dashed_external(argv);
|
|
|
|
/* It could be an alias -- this works around the insanity
|
|
* of overriding "git log" with "git show" by having
|
|
* alias.log = show
|
|
*/
|
|
if (done_alias || !handle_alias(&argc, &argv))
|
|
break;
|
|
done_alias = 1;
|
|
}
|
|
|
|
if (errno == ENOENT) {
|
|
if (done_alias) {
|
|
fprintf(stderr, "Expansion of alias '%s' failed; "
|
|
"'%s' is not a git-command\n",
|
|
cmd, argv[0]);
|
|
exit(1);
|
|
}
|
|
help_unknown_cmd(cmd);
|
|
}
|
|
|
|
fprintf(stderr, "Failed to run command '%s': %s\n",
|
|
cmd, strerror(errno));
|
|
|
|
return 1;
|
|
}
|