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su is not a login shell, so if it's in the shell's filename, don't put

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"-" before argv[0], but do put it in argv[1] because su accepts it as a
regular parameter ("-su" was breaking busybox)
This commit is contained in:
Greg Alexander 2018-05-16 10:47:17 -04:00
parent ccdb6dd87c
commit 43cd46fd0d
1 changed files with 9 additions and 8 deletions
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17
dropbear/dbutil.c
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@ -598,19 +598,20 @@ void run_shell_command(const char* cmd, unsigned int maxfd, char* usershell) {
if (cmd != NULL) { if (cmd != NULL) {
argv[0] = baseshell; argv[0] = baseshell;
argv[1] = "-c";
argv[2] = (char*)cmd;
argv[3] = NULL;
} else if (strstr(usershell, "su")) {
/* busybox requires "su" in argv[0], so don't treat it like a
* command shell */
argv[0] = baseshell;
argv[1] = "-";
argv[2] = NULL;
} else { } else {
/* a login shell should be "-bash" for "/bin/bash" etc */ /* a login shell should be "-bash" for "/bin/bash" etc */
int len = strlen(baseshell) + 2; /* 2 for "-" */ int len = strlen(baseshell) + 2; /* 2 for "-" */
argv[0] = (char*)m_malloc(len); argv[0] = (char*)m_malloc(len);
snprintf(argv[0], len, "-%s", baseshell); snprintf(argv[0], len, "-%s", baseshell);
}
if (cmd != NULL) {
argv[1] = "-c";
argv[2] = (char*)cmd;
argv[3] = NULL;
} else {
/* construct a shell of the form "-bash" etc */
argv[1] = NULL; argv[1] = NULL;
} }