tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
samples/seccomp: Adjust sample to also provide kill option
As a quick way to test SECCOMP_RET_KILL, have a negative errno mean to
kill the process.
While we're in here, also swap the arch and syscall arguments so they're
ordered more like how seccomp filters order them.
Signed-off-by: Kees Cook <keescook@chromium.org>
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-2
+7
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samples/seccomp/dropper.c
+7
-2
samples/seccomp/dropper.c
···
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#include <sys/prctl.h>
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#include <unistd.h>
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-
static int install_filter(int nr, int arch, int error)
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static int install_filter(int arch, int nr, int error)
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{
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struct sock_filter filter[] = {
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
···
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.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
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.filter = filter,
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};
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if (error == -1) {
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struct sock_filter kill = BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL);
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filter[4] = kill;
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}
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if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
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perror("prctl(NO_NEW_PRIVS)");
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return 1;
···
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{
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if (argc < 5) {
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fprintf(stderr, "Usage:\n"
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"dropper <syscall_nr> <arch> <errno> <prog> [<args>]\n"
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"dropper <arch> <syscall_nr> <errno> <prog> [<args>]\n"
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"Hint: AUDIT_ARCH_I386: 0x%X\n"
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" AUDIT_ARCH_X86_64: 0x%X\n"
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" errno == -1 means SECCOMP_RET_KILL\n"
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"\n", AUDIT_ARCH_I386, AUDIT_ARCH_X86_64);
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return 1;
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}