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author | Randall Spangler <rspangler@chromium.org> | 2011-03-12 16:34:15 -0800 |
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committer | Randall Spangler <rspangler@chromium.org> | 2011-03-12 16:34:15 -0800 |
commit | 4a16d08b03181c749e3bd64e2eb3caa036a54474 (patch) | |
tree | 28bbf77640005a32f090b9e348300adf7e358764 | |
parent | 95c4031ce903258036beeed0705d25c7e9d25da0 (diff) | |
download | vboot-4a16d08b03181c749e3bd64e2eb3caa036a54474.tar.gz |
Add cros_debug option to crossystem (R11 branch)
Add check-value support and check /proc/cmdline for cros_nodebug
Change-Id: I35158810184be03f18d98893e4dd640088384579
BUG=12904
TEST=manual
crossystem fwb_tries=1
crossystem fwb_tries?1 && echo YES || echo NO --> YES
crossystem fwb_tries?0x01 && echo YES || echo NO --> YES
crossystem fwb_tries?0 && echo YES || echo NO --> NO
crossystem fwb_tries=0
crossystem fwb_tries?0 && echo YES || echo NO --> YES
crossystem fwb_tries?1 && echo YES || echo NO --> NO
crossystem fwb_tries?0x01 && echo YES || echo NO --> NO
crossystem ecfw_act --> RW (if it's not, change RW to RO in the tests below)
crossystem ecfw_act?RW && echo YES || echo NO --> YES
crossystem ecfw_act?BOB && echo YES || echo NO --> NO
For the following tests, boot Alex with dev switch on and fwb_tries=1
Expected output of `crossystem mainfw_type mainfw_act cros_debug` under each of the following scenarios:
* Neither "cros_debug" nor" cros_nodebug" in kernel command line: normal B 1
* Kernel command line changed to include "cros_nodebug": normal B 0
* Kernel command line changed to include "cros_nodebugg": normal B 1
* Kernel command line changed to include "ccros_nodebug": normal B 1
Review URL: http://codereview.chromium.org/6665005
(cherry picked from commit 227f792c1ba64eb8dd3474395659e27696fcf355)
Add cros_debug option to crossystem
Change-Id: Ie62364a87f7f144ee647054d2a9ef83522cdbe7d
BUG=12904
TEST=manual
Expected output of `crossystem mainfw_type cros_debug` under each of the following scenarios:
* Boot Alex with dev switch off: normal 0
* Boot Alex with dev switch on (and dev firmware): developer 1
* Boot Alex with dev switch on (and normal firmware): normal 1
* Boot Alex with recovery firmware: recovery 0
* Boot Alex with dev switch off, then turn the dev switch on after booting: normal 0
* Boot Cr-48 with dev switch off: normal 0
* Boot Cr-48 with dev switch on: developer 1
* Boot Cr-48 with recovery firmware: recovery 0
* Boot Alex with dev switch off and kernel command line changed to include "cros_debug": normal 1
* Boot Alex with dev switch off and kernel command line changed to include "cros_debugg": normal 0
* Boot Alex with dev switch off and kernel command line changed to include "ccros_debug": normal 0
* Boot H2O BIOS with kernel command line changed to include "cros_debug": nonchrome 1
* Boot H2O BIOS with kernel command line changed to include "cros_debugg": nonchrome 0
* Boot H2O BIOS with kernel command line changed to include "ccros_debug": nonchrome 0
Review URL: http://codereview.chromium.org/6659021
(cherry picked from commit 196e1772ed9092a679767c0497343799f13d2875)
Review URL: http://codereview.chromium.org/6680010
-rw-r--r-- | host/lib/crossystem.c | 56 | ||||
-rw-r--r-- | utility/crossystem_main.c | 45 |
2 files changed, 92 insertions, 9 deletions
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c index 5951e10b..04dc9756 100644 --- a/host/lib/crossystem.c +++ b/host/lib/crossystem.c @@ -54,6 +54,10 @@ #define BINF0_S3_RESUME_FAILED 10 /* Recovery caused by TPM error */ #define BINF0_RECOVERY_TPM_ERROR 11 +/* Firmware types from BINF.3 */ +#define BINF3_RECOVERY 0 +#define BINF3_NORMAL 1 +#define BINF3_DEVELOPER 2 /* Base name for ACPI files */ #define ACPI_BASE_PATH "/sys/devices/platform/chromeos_acpi" @@ -69,9 +73,12 @@ #define GPIO_BASE_PATH "/sys/class/gpio" #define GPIO_EXPORT_PATH GPIO_BASE_PATH "/export" -/* Base name for NVRAM file */ +/* Filename for NVRAM file */ #define NVRAM_PATH "/dev/nvram" +/* Filename for kernel command line */ +#define KERNEL_CMDLINE_PATH "/proc/cmdline" + /* Copy up to dest_size-1 characters from src to dest, ensuring null termination (which strncpy() doesn't do). Returns the destination @@ -414,11 +421,11 @@ const char* VbReadMainFwType(char* dest, int size) { /* Try reading type from BINF.3 */ switch(ReadFileInt(ACPI_BINF_PATH ".3")) { - case 0: + case BINF3_RECOVERY: return StrCopy(dest, "recovery", size); - case 1: + case BINF3_NORMAL: return StrCopy(dest, "normal", size); - case 2: + case BINF3_DEVELOPER: return StrCopy(dest, "developer", size); default: break; /* Fall through to legacy handling */ @@ -450,6 +457,45 @@ const char* VbReadMainFwType(char* dest, int size) { } +/* Determine whether OS-level debugging should be allowed. Passed the + * destination and its size. Returns 1 if yes, 0 if no, -1 if error. */ +int VbGetCrosDebug(void) { + FILE* f = NULL; + char buf[4096] = ""; + int binf3; + char *t, *saveptr; + + /* Try reading firmware type from BINF.3. */ + binf3 = ReadFileInt(ACPI_BINF_PATH ".3"); + if (BINF3_RECOVERY == binf3) + return 0; /* Recovery mode never allows debug. */ + else if (BINF3_DEVELOPER == binf3) + return 1; /* Developer firmware always allows debug. */ + + /* Normal new firmware, older ChromeOS firmware, or non-Chrome firmware. + * For all these cases, check /proc/cmdline for cros_[no]debug. */ + f = fopen(KERNEL_CMDLINE_PATH, "rt"); + if (f) { + if (NULL == fgets(buf, sizeof(buf), f)) + *buf = 0; + fclose(f); + } + for (t = strtok_r(buf, " ", &saveptr); t; t=strtok_r(NULL, " ", &saveptr)) { + if (0 == strcmp(t, "cros_debug")) + return 1; + else if (0 == strcmp(t, "cros_nodebug")) + return 0; + } + + /* Normal new firmware or older Chrome OS firmware allows debug if the + * dev switch is on. */ + if (1 == ReadFileBit(ACPI_CHSW_PATH, CHSW_DEV_BOOT)) + return 1; + + /* All other cases disallow debug. */ + return 0; +} + /* Read a system property integer. * @@ -512,6 +558,8 @@ int VbGetSystemPropertyInt(const char* name) { return VbGetRecoveryReason(); } else if (!strcasecmp(name,"fmap_base")) { value = ReadFileInt(ACPI_FMAP_PATH); + } else if (!strcasecmp(name,"cros_debug")) { + value = VbGetCrosDebug(); } return value; diff --git a/utility/crossystem_main.c b/utility/crossystem_main.c index 35d6ea70..90ad718b 100644 --- a/utility/crossystem_main.c +++ b/utility/crossystem_main.c @@ -34,6 +34,7 @@ const Param sys_param_list[] = { {"savedmem_size", 0, 0, "RAM debug data area size in bytes"}, {"fmap_base", 0, 0, "Main firmware flashmap physical address", "0x%08x"}, {"tried_fwb", 0, 0, "Tried firmware B before A this boot"}, + {"cros_debug", 0, 0, "OS should allow debug features"}, /* Read-only strings */ {"hwid", 1, 0, "Hardware ID"}, {"fwid", 1, 0, "Active firmware ID"}, @@ -69,8 +70,11 @@ void PrintHelp(const char *progname) { " Prints the current value(s) of the parameter(s).\n" " %s [param1=value1] [param2=value2 [...]]]\n" " Sets the parameter(s) to the specified value(s).\n" + " %s [param1?value1] [param2?value2 [...]]]\n" + " Checks if the parameter(s) all contain the specified value(s).\n" + "Stops at the first error." "\n" - "Valid parameters:\n", progname, progname, progname); + "Valid parameters:\n", progname, progname, progname, progname); for (p = sys_param_list; p->name; p++) printf(" %-22s %s\n", p->name, p->desc); } @@ -100,7 +104,7 @@ int SetParam(const Param* p, const char* value) { return (0 == VbSetSystemPropertyString(p->name, value) ? 0 : 1); } else { char* e; - int i = strtol(value, &e, 0); + int i = (int)strtol(value, &e, 0); if (!*value || (e && *e)) return 1; return (0 == VbSetSystemPropertyInt(p->name, i) ? 0 : 1); @@ -108,6 +112,28 @@ int SetParam(const Param* p, const char* value) { } +/* Compares the parameter with the expected value. + * + * Returns 0 if success (match), non-zero if error (mismatch). */ +int CheckParam(const Param* p, char* expect) { + if (p->is_string) { + char buf[256]; + const char* v = VbGetSystemPropertyString(p->name, buf, sizeof(buf)); + if (!v || 0 != strcmp(v, expect)) + return 1; + } else { + char* e; + int i = (int)strtol(expect, &e, 0); + int v = VbGetSystemPropertyInt(p->name); + if (!*expect || (e && *e)) + return 1; + if (v == -1 || i != v) + return 1; + } + return 0; +} + + /* Print the specified parameter. * * Returns 0 if success, non-zero if error. */ @@ -178,19 +204,28 @@ int main(int argc, char* argv[]) { /* Otherwise, loop through params and get/set them */ for (i = 1; i < argc && retval == 0; i++) { - char* name = strtok(argv[i], "="); - char* value = strtok(NULL, "="); + int has_set = (NULL != strchr(argv[i], '=')); + int has_expect = (NULL != strchr(argv[i], '?')); + char* name = strtok(argv[i], "=?"); + char* value = strtok(NULL, "=?"); const Param* p = FindParam(name); if (!p) { fprintf(stderr, "Invalid parameter name: %s\n", name); PrintHelp(progname); return 1; } + if (has_set && has_expect) { + fprintf(stderr, "Use either = or ? in a parameter, but not both.\n"); + PrintHelp(progname); + return 1; + } if (i > 1) printf(" "); /* Output params space-delimited */ - if (value) + if (has_set) retval = SetParam(p, value); + else if (has_expect) + retval = CheckParam(p, value); else retval = PrintParam(p); } |