#define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #define pr_err(fmt, ...) \ ({ \ fprintf(stderr, "%s:%d:" fmt ": %m\n", \ __func__, __LINE__, ##__VA_ARGS__); \ 1; \ }) #define NSIO 0xb7 #define NS_GET_USERNS _IO(NSIO, 0x1) #define NS_GET_PARENT _IO(NSIO, 0x2) #define __stack_aligned__ __attribute__((aligned(16))) struct cr_clone_arg { char stack[128] __stack_aligned__; char stack_ptr[0]; }; static int child(void *args) { prctl(PR_SET_PDEATHSIG, SIGKILL); while (1) sleep(1); exit(0); } int main(int argc, char *argv[]) { char *ns_strs[] = {"pid", "user"}; char path[] = "/proc/0123456789/ns/pid"; struct cr_clone_arg ca; struct stat st1, st2; int ns, pns, i; pid_t pid; pid = clone(child, ca.stack_ptr, CLONE_NEWUSER | CLONE_NEWPID | SIGCHLD, NULL); if (pid < 0) return pr_err("clone"); for (i = 0; i < 2; i++) { snprintf(path, sizeof(path), "/proc/%d/ns/%s", pid, ns_strs[i]); ns = open(path, O_RDONLY); if (ns < 0) return pr_err("Unable to open %s", path); pns = ioctl(ns, NS_GET_PARENT); if (pns < 0) return pr_err("Unable to get a parent pidns"); snprintf(path, sizeof(path), "/proc/self/ns/%s", ns_strs[i]); if (stat(path, &st2)) return pr_err("Unable to stat %s", path); if (fstat(pns, &st1)) return pr_err("Unable to stat the parent pidns"); if (st1.st_ino != st2.st_ino) return pr_err("NS_GET_PARENT returned a wrong namespace"); if (ioctl(pns, NS_GET_PARENT) >= 0 || errno != EPERM) return pr_err("Don't get EPERM");; } kill(pid, SIGKILL); wait(NULL); return 0; } treecommitdiff
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authorHelge Deller <deller@gmx.de>2017-01-28 11:52:02 +0100
committerHelge Deller <deller@gmx.de>2017-01-28 21:54:23 +0100
commit2ad5d52d42810bed95100a3d912679d8864421ec (patch)
tree7f93e2f906b1c86f5b76c0f4c0978d41a8a29861 /tools/arch/alpha/include/asm
parent83b5d1e3d3013dbf90645a5d07179d018c8243fa (diff)
parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header
In swab.h the "#if BITS_PER_LONG > 32" breaks compiling userspace programs if BITS_PER_LONG is #defined by userspace with the sizeof() compiler builtin. Solve this problem by using __BITS_PER_LONG instead. Since we now #include asm/bitsperlong.h avoid further potential userspace pollution by moving the #define of SHIFT_PER_LONG to bitops.h which is not exported to userspace. This patch unbreaks compiling qemu on hppa/parisc. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org>
Diffstat (limited to 'tools/arch/alpha/include/asm')