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selftests/x86: Add a test for process_vm_readv() on the vsyscall page

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get_gate_page() is a piece of somewhat alarming code to make
get_user_pages() work on the vsyscall page.  Test it via
process_vm_readv().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/0fe34229a9330e8f9de9765967939cc4f1cf26b1.1561610354.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2019-06-26 21:45:09 -07:00 committed by Thomas Gleixner
parent 441cedab2d
commit 7f0a5e0755
1 changed files with 35 additions and 0 deletions
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35
tools/testing/selftests/x86/test_vsyscall.c
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@ -18,6 +18,7 @@
#include <sched.h>
#include <stdbool.h>
#include <setjmp.h>
#include <sys/uio.h>
#ifdef __x86_64__
# define VSYS(x) (x)
@ -459,6 +460,38 @@ static int test_vsys_x(void)
return 0;
}
static int test_process_vm_readv(void)
{
#ifdef __x86_64__
char buf[4096];
struct iovec local, remote;
int ret;
printf("[RUN]\tprocess_vm_readv() from vsyscall page\n");
local.iov_base = buf;
local.iov_len = 4096;
remote.iov_base = (void *)0xffffffffff600000;
remote.iov_len = 4096;
ret = process_vm_readv(getpid(), &local, 1, &remote, 1, 0);
if (ret != 4096) {
printf("[OK]\tprocess_vm_readv() failed (ret = %d, errno = %d)\n", ret, errno);
return 0;
}
if (vsyscall_map_r) {
if (!memcmp(buf, (const void *)0xffffffffff600000, 4096)) {
printf("[OK]\tIt worked and read correct data\n");
} else {
printf("[FAIL]\tIt worked but returned incorrect data\n");
return 1;
}
}
#endif
return 0;
}
#ifdef __x86_64__
#define X86_EFLAGS_TF (1UL << 8)
static volatile sig_atomic_t num_vsyscall_traps;
@ -533,6 +566,8 @@ int main(int argc, char **argv)
nerrs += test_vsys_r();
nerrs += test_vsys_x();
nerrs += test_process_vm_readv();
#ifdef __x86_64__
nerrs += test_emulation();
#endif