Created
April 26, 2020 01:42
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Diff for https://github.com/gdbinit/readkmem
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diff --git a/readkmem/main.c b/readkmem/main.c | |
index bd0f398..f8aa47b 100644 | |
--- a/readkmem/main.c | |
+++ b/readkmem/main.c | |
@@ -324,7 +324,7 @@ readkmem(void *buffer, mach_vm_address_t target_addr, size_t size) | |
kern_return_t kr = mach_vm_read_overwrite(g_kmem_source.kernel_port, target_addr, size, (mach_vm_address_t)buffer, &outsize); | |
if (kr != KERN_SUCCESS) | |
{ | |
- ERROR_MSG("mach_vm_read_overwrite failed!"); | |
+ ERROR_MSG("mach_vm_read_overwrite failed! kr: %d", kr); | |
exit(-1); | |
} | |
} | |
@@ -455,6 +455,7 @@ int main(int argc, char ** argv) | |
kern_return_t kr = 0; | |
int valid_kernel_port = 0; | |
+ /* | |
kr = processor_set_default(host_port, &proc_set_default); | |
if (kr == KERN_SUCCESS) | |
{ | |
@@ -470,10 +471,13 @@ int main(int argc, char ** argv) | |
} | |
} | |
} | |
+ */ | |
+ | |
/* kernel not vulnerable, try to use /dev/kmem */ | |
if (valid_kernel_port == 0) | |
{ | |
- if((g_kmem_source.fd = open("/dev/kmem",O_RDWR)) == -1) | |
+ // if((g_kmem_source.fd = open("/dev/kmem",O_RDWR)) == -1) | |
+ if((g_kmem_source.fd = open("/dev/kmem",O_RDONLY)) == -1) | |
{ | |
ERROR_MSG("Error while opening /dev/kmem. Is /dev/kmem enabled?"); | |
ERROR_MSG("Add parameter kmem=1 to /Library/Preferences/SystemConfiguration/com.apple.Boot.plist."); |
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Had to comment out the code for
processor_set_tasks()
vulnerability because/dev/kmem
wasn't getting used otherwise.System:
Output:
osfmk/mach/i386/vm_param.h:
bsd/dev/mem.c:
https://opensource.apple.com/source/xnu/xnu-4570.71.2