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Remove all sprintf calls

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Replace them with snprintf, which ensures buffer overflows won't
happen.
This commit is contained in:
Simon Ser 2022-02-08 09:52:24 +01:00 • committed by Simon Zeni
parent ac7892371c
commit f707f583e1
4 changed files with 7 additions and 6 deletions
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4
swaynag/config.c
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@ -414,8 +414,8 @@ int swaynag_load_config(char *path, struct swaynag *swaynag, list_t *types) {
}
free(name);
} else {
char *flag = malloc(sizeof(char) * (nread + 3));
sprintf(flag, "--%s", line);
char *flag = malloc(nread + 3);
snprintf(flag, nread + 3, "--%s", line);
char *argv[] = {"swaynag", flag};
result = swaynag_parse_options(2, argv, swaynag, types, type,
NULL, NULL);

5
swaynag/swaynag.c
View file

@ -28,8 +28,9 @@ static bool terminal_execute(char *terminal, char *command) {
fprintf(tmp, "#!/bin/sh\nrm %s\n%s", fname, command);
fclose(tmp);
chmod(fname, S_IRUSR | S_IWUSR | S_IXUSR);
char *cmd = malloc(sizeof(char) * (strlen(terminal) + strlen(" -e ") + strlen(fname) + 1));
sprintf(cmd, "%s -e %s", terminal, fname);
size_t cmd_size = strlen(terminal) + strlen(" -e ") + strlen(fname) + 1;
char *cmd = malloc(cmd_size);
snprintf(cmd, cmd_size, "%s -e %s", terminal, fname);
execlp("sh", "sh", "-c", cmd, NULL);
sway_log_errno(SWAY_ERROR, "Failed to run command, execlp() returned.");
free(cmd);