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Elevate capability #6

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Elevate capability #6

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64931b7
made elevate syscall available only to root users
FlareCoding Apr 24, 2023
1d4351e
fixed gcc warning about ISO standard
FlareCoding Apr 24, 2023
8454c29
added a new CAP_SYMBI_ELEV capability
FlareCoding Apr 25, 2023
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6 changes: 5 additions & 1 deletion include/uapi/linux/capability.h
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Original file line number Diff line number Diff line change
Expand Up @@ -418,7 +418,11 @@ struct vfs_ns_cap_data {

#define CAP_CHECKPOINT_RESTORE 40

#define CAP_LAST_CAP CAP_CHECKPOINT_RESTORE
/* Allow performing the elevate syscall and make use of symbiote functionality */

#define CAP_SYMBI_ELEV 41

#define CAP_LAST_CAP CAP_SYMBI_ELEV

#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

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3 changes: 3 additions & 0 deletions kernel/sys.c
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Expand Up @@ -1095,6 +1095,9 @@ SYSCALL_DEFINE1(elevate, unsigned long, flags)
struct SymbiReg sreg;
sreg.raw = flags;

if (!capable(CAP_SYMBI_ELEV))
return -EPERM;

// User's registers
regs = (struct pt_regs *)this_cpu_read(cpu_current_top_of_stack) - 1;

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4 changes: 2 additions & 2 deletions security/selinux/include/classmap.h
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Expand Up @@ -28,9 +28,9 @@

#define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \
"wake_alarm", "block_suspend", "audit_read", "perfmon", "bpf", \
"checkpoint_restore"
"checkpoint_restore", "symbi_elev"

#if CAP_LAST_CAP > CAP_CHECKPOINT_RESTORE
#if CAP_LAST_CAP > CAP_SYMBI_ELEV
#error New capability defined, please update COMMON_CAP2_PERMS.
#endif

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