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Fix commandline handling for ARM semihosted executables

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Use the copy of the command line that loader_build_argptr() sets up in guest
memory as the command line to return from the ARM SYS_GET_CMDLINE semihosting
call. Previously we were using a pointer to memory which had already been
freed before the guest program started.

This fixes https://bugs.launchpad.net/qemu/+bug/673613 .

Signed-off-by: Wolfgang Schildbach <wschi@dolby.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This commit is contained in:
Wolfgang Schildbach 2010-12-06 15:06:05 +00:00 committed by Riku Voipio
parent 3ebe80c299
commit 2e8785acc6
1 changed files with 50 additions and 31 deletions
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77
arm-semi.c
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@ -373,42 +373,61 @@ uint32_t do_arm_semihosting(CPUState *env)
#ifdef CONFIG_USER_ONLY
/* Build a commandline from the original argv. */
{
char **arg = ts->info->host_argv;
int len = ARG(1);
/* lock the buffer on the ARM side */
char *cmdline_buffer = (char*)lock_user(VERIFY_WRITE, ARG(0), len, 0);
char *arm_cmdline_buffer;
const char *host_cmdline_buffer;
if (!cmdline_buffer)
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
unsigned int i;
unsigned int arm_cmdline_len = ARG(1);
unsigned int host_cmdline_len =
ts->info->arg_end-ts->info->arg_start;
s = cmdline_buffer;
while (*arg && len > 2) {
int n = strlen(*arg);
if (s != cmdline_buffer) {
*(s++) = ' ';
len--;
if (!arm_cmdline_len || host_cmdline_len > arm_cmdline_len) {
return -1; /* not enough space to store command line */
}
if (n >= len)
n = len - 1;
memcpy(s, *arg, n);
s += n;
len -= n;
arg++;
}
/* Null terminate the string. */
*s = 0;
len = s - cmdline_buffer;
/* Unlock the buffer on the ARM side. */
unlock_user(cmdline_buffer, ARG(0), len);
if (!host_cmdline_len) {
/* We special-case the "empty command line" case (argc==0).
Just provide the terminating 0. */
arm_cmdline_buffer = lock_user(VERIFY_WRITE, ARG(0), 1, 0);
arm_cmdline_buffer[0] = 0;
unlock_user(arm_cmdline_buffer, ARG(0), 1);
/* Adjust the commandline length argument. */
SET_ARG(1, len);
SET_ARG(1, 0);
return 0;
}
/* Return success if commandline fit into buffer. */
return *arg ? -1 : 0;
/* lock the buffers on the ARM side */
arm_cmdline_buffer =
lock_user(VERIFY_WRITE, ARG(0), host_cmdline_len, 0);
host_cmdline_buffer =
lock_user(VERIFY_READ, ts->info->arg_start,
host_cmdline_len, 1);
if (arm_cmdline_buffer && host_cmdline_buffer)
{
/* the last argument is zero-terminated;
no need for additional termination */
memcpy(arm_cmdline_buffer, host_cmdline_buffer,
host_cmdline_len);
/* separate arguments by white spaces */
for (i = 0; i < host_cmdline_len-1; i++) {
if (arm_cmdline_buffer[i] == 0) {
arm_cmdline_buffer[i] = ' ';
}
}
/* Adjust the commandline length argument. */
SET_ARG(1, host_cmdline_len-1);
}
/* Unlock the buffers on the ARM side. */
unlock_user(arm_cmdline_buffer, ARG(0), host_cmdline_len);
unlock_user((void*)host_cmdline_buffer, ts->info->arg_start, 0);
/* Return success if we could return a commandline. */
return (arm_cmdline_buffer && host_cmdline_buffer) ? 0 : -1;
}
#else
return -1;