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exile.h
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Code Issues 14 Pull Requests 1 Releases Wiki Activity

pledge: Add EXILE_SYSCALL_PLEDGE_SECCOMP_INSTALL to allow adding further seccomp filters

This commit is contained in:
Albert S. 2021-12-27 11:02:52 +01:00
parent 9abbc7510c
commit 6711b394d9
1 changed files with 15 additions and 9 deletions
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24
exile.h
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@ -279,11 +279,12 @@ struct exile_path_policy
#define EXILE_SYSCALL_PLEDGE_PROT_EXEC ((uint64_t)1<<13)
#define EXILE_SYSCALL_PLEDGE_RPATH ((uint64_t)1<<14)
#define EXILE_SYSCALL_PLEDGE_SCHED ((uint64_t)1<<15)
#define EXILE_SYSCALL_PLEDGE_SHM ((uint64_t)1<<16)
#define EXILE_SYSCALL_PLEDGE_STDIO ((uint64_t)1<<17)
#define EXILE_SYSCALL_PLEDGE_THREAD ((uint64_t)1<<18)
#define EXILE_SYSCALL_PLEDGE_UNIX ((uint64_t)1<<19)
#define EXILE_SYSCALL_PLEDGE_WPATH ((uint64_t)1<<20)
#define EXILE_SYSCALL_PLEDGE_SECCOMP_INSTALL ((uint64_t)1<<16)
#define EXILE_SYSCALL_PLEDGE_SHM ((uint64_t)1<<17)
#define EXILE_SYSCALL_PLEDGE_STDIO ((uint64_t)1<<18)
#define EXILE_SYSCALL_PLEDGE_THREAD ((uint64_t)1<<19)
#define EXILE_SYSCALL_PLEDGE_UNIX ((uint64_t)1<<20)
#define EXILE_SYSCALL_PLEDGE_WPATH ((uint64_t)1<<21)
#define EXILE_SYSCALL_PLEDGE_DENY_ERROR ((uint64_t)1<<63)
@ -478,7 +479,7 @@ static struct syscall_pledge_map exile_pledge_map[] =
{EXILE_SYS(mlockall), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(munlockall), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(vhangup), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(prctl), EXILE_SYSCALL_PLEDGE_STDIO|EXILE_SYSCALL_PLEDGE_PRCTL},
{EXILE_SYS(prctl), EXILE_SYSCALL_PLEDGE_STDIO|EXILE_SYSCALL_PLEDGE_PRCTL|EXILE_SYSCALL_PLEDGE_SECCOMP_INSTALL},
{EXILE_SYS(setrlimit), EXILE_SYSCALL_PLEDGE_PROC},
{EXILE_SYS(sync), EXILE_SYSCALL_PLEDGE_STDIO},
{EXILE_SYS(gettid), EXILE_SYSCALL_PLEDGE_STDIO},
@ -696,9 +697,10 @@ static int get_pledge_argfilter(long syscall, uint64_t pledge_promises, struct s
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),
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),
EXILE_BPF_NOP,
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;
@ -798,6 +800,10 @@ static int get_pledge_argfilter(long syscall, uint64_t pledge_promises, struct s
result = 0;
break;
}
if(pledge_promises & EXILE_SYSCALL_PLEDGE_SECCOMP_INSTALL)
{
prctl_default[3] = (struct sock_filter) BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, PR_SET_SECCOMP, EXILE_SYSCALL_EXIT_BPF_RETURN, 0);
}
result = sizeof(prctl_default)/sizeof(prctl_default[0]);
memcpy(filter, prctl_default, sizeof(prctl_default));
break;