[PATCH 22/27] um: Add stub side of SECCOMP/futex based process handling
Benjamin Berg
benjamin at sipsolutions.net
Wed Mar 3 15:55:18 GMT 2021
This adds the stub side for the new seccomp process management code. In
this case we do register save/restore through the signal handler
mcontext. For the FS_BASE/GS_BASE register we need special handling.
Co-authored-by: Johannes Berg <johannes at sipsolutions.net>
Signed-off-by: Benjamin Berg <benjamin at sipsolutions.net>
---
arch/um/include/shared/skas/stub-data.h | 15 +++++++
arch/um/kernel/skas/clone.c | 25 ++++++++++++
arch/um/kernel/skas/stub.c | 53 +++++++++++++++++++++++++
arch/x86/um/shared/sysdep/stub-data.h | 11 +++++
arch/x86/um/shared/sysdep/stub.h | 3 ++
arch/x86/um/shared/sysdep/stub_32.h | 5 +++
arch/x86/um/shared/sysdep/stub_64.h | 10 +++++
7 files changed, 122 insertions(+)
create mode 100644 arch/x86/um/shared/sysdep/stub-data.h
diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
index efa78bc359cb..e130c428cda9 100644
--- a/arch/um/include/shared/skas/stub-data.h
+++ b/arch/um/include/shared/skas/stub-data.h
@@ -8,8 +8,13 @@
#ifndef __STUB_DATA_H
#define __STUB_DATA_H
+#include <linux/kconfig.h>
#include <linux/compiler_types.h>
#include <as-layout.h>
+#include <sysdep/stub-data.h>
+
+#define FUTEX_IN_CHILD 0
+#define FUTEX_IN_KERN 1
#define STUB_NEXT_SYSCALL(s) \
((struct stub_syscall *) (((unsigned long) s) + (s)->cmd_len))
@@ -32,6 +37,16 @@ struct stub_data {
unsigned char syscall_data[UM_KERN_PAGE_SIZE - MINSIGSTKSZ - 128]
__aligned(16);
+ /* data shared with signal handler (only used in seccomp mode) */
+ short restart_wait;
+ unsigned int futex;
+ int signal;
+ unsigned short si_offset;
+ unsigned short mctx_offset;
+
+ /* seccomp architecture specific state restore */
+ struct stub_data_arch arch_data;
+
/* Stack for our signal handlers and for calling into . */
unsigned char sigstack[MINSIGSTKSZ + 32] __aligned(16);
};
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
index a680d80b3870..d6e0742c77fd 100644
--- a/arch/um/kernel/skas/clone.c
+++ b/arch/um/kernel/skas/clone.c
@@ -49,3 +49,28 @@ stub_clone_handler(void)
done:
trap_myself();
}
+
+#ifdef CONFIG_UML_SECCOMP
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_clone_handler_seccomp(void)
+{
+ int stack;
+ struct stub_data *data = (void *) ((unsigned long)&stack & ~(UM_KERN_PAGE_SIZE - 1));
+ long err;
+
+ /* Use the syscall data as a temporary stack area. */
+ err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
+ (unsigned long) data->syscall_data +
+ sizeof(data->syscall_data) -
+ sizeof(void *));
+ if (err) {
+ data->err = err;
+ goto done;
+ }
+
+ remap_stack_and_trap();
+
+ done:
+ trap_myself();
+}
+#endif
diff --git a/arch/um/kernel/skas/stub.c b/arch/um/kernel/skas/stub.c
index 5d1bcc883866..4bf32fdf4599 100644
--- a/arch/um/kernel/skas/stub.c
+++ b/arch/um/kernel/skas/stub.c
@@ -5,6 +5,13 @@
#include <sysdep/stub.h>
+#ifdef CONFIG_UML_SECCOMP
+#include <linux/futex.h>
+#include <errno.h>
+
+#define CATCH_EINTR(expr) while ((res = (expr)) && (res == -EINTR))
+#endif
+
static __always_inline int
syscall_handler(struct stub_data *d)
{
@@ -50,3 +57,49 @@ stub_syscall_handler(void)
trap_myself();
}
+
+#ifdef CONFIG_UML_SECCOMP
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_signal_interrupt(int sig, siginfo_t *info, void *p)
+{
+ int stack;
+ struct stub_data *d = (void *) ((unsigned long)&stack & ~(UM_KERN_PAGE_SIZE - 1));
+ ucontext_t *uc = p;
+ long res;
+
+ d->signal = sig;
+ d->si_offset = (unsigned long)info - (unsigned long)&d->sigstack[0];
+ d->mctx_offset = (unsigned long)&uc->uc_mcontext - (unsigned long)&d->sigstack[0];
+
+restart_wait:
+ d->futex = FUTEX_IN_KERN;
+ CATCH_EINTR(stub_syscall3(__NR_futex, (unsigned long)&d->futex,
+ FUTEX_WAKE, 1));
+ do {
+ res = stub_syscall4(__NR_futex, (unsigned long)&d->futex,
+ FUTEX_WAIT, FUTEX_IN_KERN, 0);
+ } while (res == -EINTR || d->futex == FUTEX_IN_KERN);
+
+ if (res < 0 && res != -EAGAIN)
+ stub_syscall2(__NR_kill, 0, SIGKILL);
+
+ /* Try running queued syscalls. */
+ if (syscall_handler(d) < 0 || d->restart_wait) {
+ /* Report SIGTRAP if we restart. */
+ d->signal = SIGTRAP;
+ d->restart_wait = 0;
+ goto restart_wait;
+ }
+
+ /* Restore arch dependent state that is not part of the mcontext */
+ stub_seccomp_restore_state(&d->arch_data);
+
+ /* Return so that the host modified mcontext is restored. */
+}
+
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_signal_restorer(void)
+{
+ stub_syscall0(__NR_rt_sigreturn);
+}
+#endif
diff --git a/arch/x86/um/shared/sysdep/stub-data.h b/arch/x86/um/shared/sysdep/stub-data.h
new file mode 100644
index 000000000000..2e71b48ebb1f
--- /dev/null
+++ b/arch/x86/um/shared/sysdep/stub-data.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifdef __i386__
+struct stub_data_arch { };
+#else
+struct stub_data_arch {
+ int sync;
+ unsigned long fs_base;
+ unsigned long gs_base;
+};
+#endif
+
diff --git a/arch/x86/um/shared/sysdep/stub.h b/arch/x86/um/shared/sysdep/stub.h
index 579681d12158..eb2e3a24d40b 100644
--- a/arch/x86/um/shared/sysdep/stub.h
+++ b/arch/x86/um/shared/sysdep/stub.h
@@ -14,3 +14,6 @@
extern void stub_segv_handler(int, siginfo_t *, void *);
extern void stub_syscall_handler(void);
extern void stub_clone_handler(void);
+extern void stub_signal_interrupt(int, siginfo_t *, void *);
+extern void stub_signal_restorer(void);
+extern void stub_clone_handler_seccomp(void);
diff --git a/arch/x86/um/shared/sysdep/stub_32.h b/arch/x86/um/shared/sysdep/stub_32.h
index 3fb8559fe994..62aa7597576a 100644
--- a/arch/x86/um/shared/sysdep/stub_32.h
+++ b/arch/x86/um/shared/sysdep/stub_32.h
@@ -130,4 +130,9 @@ static __always_inline void remap_stack_and_trap(void)
"memory");
}
+static __always_inline void stub_seccomp_restore_state(struct stub_data_arch *arch)
+{
+ /* No extra arch specific restore */
+}
+
#endif
diff --git a/arch/x86/um/shared/sysdep/stub_64.h b/arch/x86/um/shared/sysdep/stub_64.h
index c41ae0462c8f..69f9aeca8cee 100644
--- a/arch/x86/um/shared/sysdep/stub_64.h
+++ b/arch/x86/um/shared/sysdep/stub_64.h
@@ -8,6 +8,7 @@
#include <sysdep/ptrace_user.h>
#include <generated/asm-offsets.h>
+#include <asm/prctl.h>
#define STUB_MMAP_NR __NR_mmap
#define MMAP_OFFSET(o) (o)
@@ -125,4 +126,13 @@ static __always_inline void remap_stack_and_trap(void)
__syscall_clobber, "r10", "r8", "r9");
}
+static __always_inline void stub_seccomp_restore_state(struct stub_data_arch *arch)
+{
+ /* TODO: Use _writefsbase_u64/_writegsbase_u64 when possible */
+ if (arch->sync & 0x1)
+ stub_syscall2(__NR_arch_prctl, ARCH_SET_FS, arch->fs_base);
+ if (arch->sync & 0x2)
+ stub_syscall2(__NR_arch_prctl, ARCH_SET_GS, arch->gs_base);
+}
+
#endif
--
2.29.2
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