crtxcr/exile.h
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pledge: Add prctl() default filter

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Albert S. 2021-12-26 19:34:16 +01:00
parent d2357ac676
commit 6b513f8339
1 changed files with 28 additions and 11 deletions
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exile.h
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@ -273,16 +273,16 @@ struct exile_path_policy
#define EXILE_SYSCALL_PLEDGE_FSNOTIFY ((uint64_t)1<<7) #define EXILE_SYSCALL_PLEDGE_FSNOTIFY ((uint64_t)1<<7)
#define EXILE_SYSCALL_PLEDGE_ID ((uint64_t)1<<8) #define EXILE_SYSCALL_PLEDGE_ID ((uint64_t)1<<8)
#define EXILE_SYSCALL_PLEDGE_INET ((uint64_t)1<<9) #define EXILE_SYSCALL_PLEDGE_INET ((uint64_t)1<<9)
#define EXILE_SYSCALL_PLEDGE_PROC ((uint64_t)1<<10) #define EXILE_SYSCALL_PLEDGE_PRCTL ((uint64_t)1<<10)
#define EXILE_SYSCALL_PLEDGE_PROT_EXEC ((uint64_t)1<<11) #define EXILE_SYSCALL_PLEDGE_PROC ((uint64_t)1<<11)
#define EXILE_SYSCALL_PLEDGE_RPATH ((uint64_t)1<<12) #define EXILE_SYSCALL_PLEDGE_PROT_EXEC ((uint64_t)1<<12)
#define EXILE_SYSCALL_PLEDGE_SCHED ((uint64_t)1<<13) #define EXILE_SYSCALL_PLEDGE_RPATH ((uint64_t)1<<13)
#define EXILE_SYSCALL_PLEDGE_SHM ((uint64_t)1<<14) #define EXILE_SYSCALL_PLEDGE_SCHED ((uint64_t)1<<14)
#define EXILE_SYSCALL_PLEDGE_STDIO ((uint64_t)1<<15) #define EXILE_SYSCALL_PLEDGE_SHM ((uint64_t)1<<15)
#define EXILE_SYSCALL_PLEDGE_THREAD ((uint64_t)1<<16) #define EXILE_SYSCALL_PLEDGE_STDIO ((uint64_t)1<<16)
#define EXILE_SYSCALL_PLEDGE_UNIX ((uint64_t)1<<17) #define EXILE_SYSCALL_PLEDGE_THREAD ((uint64_t)1<<17)
#define EXILE_SYSCALL_PLEDGE_WPATH ((uint64_t)1<<18) #define EXILE_SYSCALL_PLEDGE_UNIX ((uint64_t)1<<18)
#define EXILE_SYSCALL_PLEDGE_WPATH ((uint64_t)1<<19)
#define EXILE_SYSCALL_PLEDGE_DENY_ERROR ((uint64_t)1<<63) #define EXILE_SYSCALL_PLEDGE_DENY_ERROR ((uint64_t)1<<63)
@ -477,6 +477,7 @@ static struct syscall_pledge_map exile_pledge_map[] =
{EXILE_SYS(mlockall), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(mlockall), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(munlockall), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(munlockall), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(vhangup), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(vhangup), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(prctl), EXILE_SYSCALL_PLEDGE_STDIO|EXILE_SYSCALL_PLEDGE_PRCTL},
{EXILE_SYS(setrlimit), EXILE_SYSCALL_PLEDGE_PROC}, {EXILE_SYS(setrlimit), EXILE_SYSCALL_PLEDGE_PROC},
{EXILE_SYS(sync), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(sync), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(gettid), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(gettid), EXILE_SYSCALL_PLEDGE_STDIO},
@ -591,7 +592,7 @@ static struct syscall_pledge_map exile_pledge_map[] =
{EXILE_SYS(openat2), EXILE_SYSCALL_PLEDGE_RPATH|EXILE_SYSCALL_PLEDGE_WPATH}, {EXILE_SYS(openat2), EXILE_SYSCALL_PLEDGE_RPATH|EXILE_SYSCALL_PLEDGE_WPATH},
{EXILE_SYS(faccessat2), EXILE_SYSCALL_PLEDGE_RPATH}, {EXILE_SYS(faccessat2), EXILE_SYSCALL_PLEDGE_RPATH},
{EXILE_SYS(process_madvise), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(process_madvise), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(epoll_pwait2), EXILE_SYSCALL_PLEDGE_STDIO}, {EXILE_SYS(epoll_pwait2), EXILE_SYSCALL_PLEDGE_STDIO}
}; };
@ -692,6 +693,13 @@ static int get_pledge_argfilter(long syscall, uint64_t pledge_promises, struct s
BPF_JUMP(BPF_JMP+BPF_JSET+BPF_K, CLONE_NEWUTS, EXILE_SYSCALL_EXIT_BPF_NO_MATCH, 0) BPF_JUMP(BPF_JMP+BPF_JSET+BPF_K, CLONE_NEWUTS, EXILE_SYSCALL_EXIT_BPF_NO_MATCH, 0)
}; };
struct sock_filter prctl_default[] ={
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, (offsetof(struct seccomp_data, args[0]))),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, PR_GET_NAME, EXILE_SYSCALL_EXIT_BPF_RETURN, 0),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, PR_SET_NAME, EXILE_SYSCALL_EXIT_BPF_RETURN, 0),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, PR_CAPBSET_READ, EXILE_SYSCALL_EXIT_BPF_RETURN, EXILE_SYSCALL_EXIT_BPF_NO_MATCH),
};
int result = 0; int result = 0;
int current_filter_index = 1; int current_filter_index = 1;
switch(syscall) switch(syscall)
@ -778,6 +786,15 @@ static int get_pledge_argfilter(long syscall, uint64_t pledge_promises, struct s
result = sizeof(clone_filter)/sizeof(clone_filter[0]); result = sizeof(clone_filter)/sizeof(clone_filter[0]);
memcpy(filter, clone_filter, sizeof(clone_filter)); memcpy(filter, clone_filter, sizeof(clone_filter));
break; break;
case EXILE_SYS(prctl):
if(pledge_promises & EXILE_SYSCALL_PLEDGE_PRCTL)
{
result = 0;
break;
}
result = sizeof(prctl_default)/sizeof(prctl_default[0]);
memcpy(filter, prctl_default, sizeof(prctl_default));
break;
} }
return result; return result;
} }