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Merge branch 'exit-cleanups-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Browse Source 
Pull exit cleanups from Eric Biederman:
 "In preparation of doing something about PTRACE_EVENT_EXIT I have
  started cleaning up various pieces of code related to do_exit. Most of
  that code I did not manage to get tested and reviewed before the merge
  window opened but a handful of very useful cleanups are ready to be
  merged.

  The first change is simply the removal of the bdflush system call. The
  code has now been disabled long enough that even the oldest userspace
  working userspace setups anyone can find to test are fine with the
  bdflush system call being removed.

  Changing m68k fsp040_die to use force_sigsegv(SIGSEGV) instead of
  calling do_exit directly is interesting only in that it is nearly the
  most difficult of the incorrect uses of do_exit to remove.

  The change to the seccomp code to simply send a signal instead of
  calling do_coredump directly is a very nice little cleanup made
  possible by realizing the existing signal sending helpers were missing
  a little bit of functionality that is easy to provide"

* 'exit-cleanups-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  signal/seccomp: Dump core when there is only one live thread
  signal/seccomp: Refactor seccomp signal and coredump generation
  signal/m68k: Use force_sigsegv(SIGSEGV) in fpsp040_die
  exit/bdflush: Remove the deprecated bdflush system call
This commit is contained in:
Linus Torvalds 2021-09-01 14:52:05 -07:00
commit bcfeebbff3
25 changed files with 53 additions and 87 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/kernel/syscalls/syscall.tbl
View File

@ -230,7 +230,7 @@
259 common osf_swapctl sys_ni_syscall
260 common osf_memcntl sys_ni_syscall
261 common osf_fdatasync sys_ni_syscall
300 common bdflush sys_bdflush
300 common bdflush sys_ni_syscall
301 common sethae sys_sethae
302 common mount sys_mount
303 common old_adjtimex sys_old_adjtimex

2
arch/arm/tools/syscall.tbl
View File

@ -147,7 +147,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 common personality sys_personality
# 137 was sys_afs_syscall

2
arch/arm64/include/asm/unistd32.h
View File

@ -279,7 +279,7 @@ __SYSCALL(__NR_getpgid, sys_getpgid)
#define __NR_fchdir 133
__SYSCALL(__NR_fchdir, sys_fchdir)
#define __NR_bdflush 134
__SYSCALL(__NR_bdflush, sys_bdflush)
__SYSCALL(__NR_bdflush, sys_ni_syscall)
#define __NR_sysfs 135
__SYSCALL(__NR_sysfs, sys_sysfs)
#define __NR_personality 136

2
arch/ia64/kernel/syscalls/syscall.tbl
View File

@ -123,7 +123,7 @@
# 1135 was get_kernel_syms
# 1136 was query_module
113 common quotactl sys_quotactl
114 common bdflush sys_bdflush
114 common bdflush sys_ni_syscall
115 common sysfs sys_sysfs
116 common personality sys_personality
117 common afs_syscall sys_ni_syscall

3
arch/m68k/fpsp040/skeleton.S
View File

@ -502,7 +502,8 @@ in_ea:
.section .fixup,#alloc,#execinstr
.even
1:
jbra fpsp040_die
jbsr fpsp040_die
jbra .Lnotkern
.section __ex_table,#alloc
.align 4

2
arch/m68k/kernel/syscalls/syscall.tbl
View File

@ -141,7 +141,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 common personality sys_personality
# 137 was afs_syscall

2
arch/m68k/kernel/traps.c
View File

@ -1150,7 +1150,7 @@ asmlinkage void set_esp0(unsigned long ssp)
*/
asmlinkage void fpsp040_die(void)
{
do_exit(SIGSEGV);
force_sigsegv(SIGSEGV);
}
#ifdef CONFIG_M68KFPU_EMU

2
arch/microblaze/kernel/syscalls/syscall.tbl
View File

@ -141,7 +141,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 common personality sys_personality
137 common afs_syscall sys_ni_syscall

2
arch/mips/kernel/syscalls/syscall_o32.tbl
View File

@ -145,7 +145,7 @@
131 o32 quotactl sys_quotactl
132 o32 getpgid sys_getpgid
133 o32 fchdir sys_fchdir
134 o32 bdflush sys_bdflush
134 o32 bdflush sys_ni_syscall
135 o32 sysfs sys_sysfs
136 o32 personality sys_personality sys_32_personality
137 o32 afs_syscall sys_ni_syscall

2
arch/parisc/kernel/syscalls/syscall.tbl
View File

@ -147,7 +147,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 32 personality parisc_personality
136 64 personality sys_personality

2
arch/powerpc/kernel/syscalls/syscall.tbl
View File

@ -176,7 +176,7 @@
131 nospu quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 32 personality sys_personality ppc64_personality
136 64 personality ppc64_personality

2
arch/s390/kernel/syscalls/syscall.tbl
View File

@ -122,7 +122,7 @@
131 common quotactl sys_quotactl sys_quotactl
132 common getpgid sys_getpgid sys_getpgid
133 common fchdir sys_fchdir sys_fchdir
134 common bdflush sys_bdflush sys_bdflush
134 common bdflush sys_ni_syscall sys_ni_syscall
135 common sysfs sys_sysfs sys_sysfs
136 common personality sys_s390_personality sys_s390_personality
137 common afs_syscall - -

2
arch/sh/kernel/syscalls/syscall.tbl
View File

@ -141,7 +141,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 common personality sys_personality
# 137 was afs_syscall

2
arch/sparc/kernel/syscalls/syscall.tbl
View File

@ -270,7 +270,7 @@
222 common delete_module sys_delete_module
223 common get_kernel_syms sys_ni_syscall
224 common getpgid sys_getpgid
225 common bdflush sys_bdflush
225 common bdflush sys_ni_syscall
226 common sysfs sys_sysfs
227 common afs_syscall sys_nis_syscall
228 common setfsuid sys_setfsuid16

2
arch/x86/entry/syscalls/syscall_32.tbl
View File

@ -145,7 +145,7 @@
131 i386 quotactl sys_quotactl
132 i386 getpgid sys_getpgid
133 i386 fchdir sys_fchdir
134 i386 bdflush sys_bdflush
134 i386 bdflush sys_ni_syscall
135 i386 sysfs sys_sysfs
136 i386 personality sys_personality
137 i386 afs_syscall

2
arch/xtensa/kernel/syscalls/syscall.tbl
View File

@ -223,7 +223,7 @@
# 205 was old nfsservctl
205 common nfsservctl sys_ni_syscall
206 common _sysctl sys_ni_syscall
207 common bdflush sys_bdflush
207 common bdflush sys_ni_syscall
208 common uname sys_newuname
209 common sysinfo sys_sysinfo
210 common init_module sys_init_module

27
fs/buffer.c
View File

@ -3267,33 +3267,6 @@ out:
}
EXPORT_SYMBOL(try_to_free_buffers);
/*
* There are no bdflush tunables left. But distributions are
* still running obsolete flush daemons, so we terminate them here.
*
* Use of bdflush() is deprecated and will be removed in a future kernel.
* The `flush-X' kernel threads fully replace bdflush daemons and this call.
*/
SYSCALL_DEFINE2(bdflush, int, func, long, data)
{
static int msg_count;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (msg_count < 5) {
msg_count++;
printk(KERN_INFO
"warning: process `%s' used the obsolete bdflush"
" system call\n", current->comm);
printk(KERN_INFO "Fix your initscripts?\n");
}
if (func == 1)
do_exit(0);
return 0;
}
/*
* Buffer-head allocation
*/

1
include/linux/sched/signal.h
View File

@ -324,6 +324,7 @@ int force_sig_ptrace_errno_trap(int errno, void __user *addr);
int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno);
int send_sig_fault_trapno(int sig, int code, void __user *addr, int trapno,
struct task_struct *t);
int force_sig_seccomp(int syscall, int reason, bool force_coredump);
extern int send_sig_info(int, struct kernel_siginfo *, struct task_struct *);
extern void force_sigsegv(int sig);

1
include/linux/syscalls.h
View File

@ -1158,7 +1158,6 @@ asmlinkage long sys_ustat(unsigned dev, struct ustat __user *ubuf);
asmlinkage long sys_vfork(void);
asmlinkage long sys_recv(int, void __user *, size_t, unsigned);
asmlinkage long sys_send(int, void __user *, size_t, unsigned);
asmlinkage long sys_bdflush(int func, long data);
asmlinkage long sys_oldumount(char __user *name);
asmlinkage long sys_uselib(const char __user *library);
asmlinkage long sys_sysfs(int option,

1
include/uapi/linux/capability.h
View File

@ -243,7 +243,6 @@ struct vfs_ns_cap_data {
/* Allow examination and configuration of disk quotas */
/* Allow setting the domainname */
/* Allow setting the hostname */
/* Allow calling bdflush() */
/* Allow mount() and umount(), setting up new smb connection */
/* Allow some autofs root ioctls */
/* Allow nfsservctl */

42
kernel/seccomp.c
View File

@ -922,30 +922,6 @@ void get_seccomp_filter(struct task_struct *tsk)
refcount_inc(&orig->users);
}
static void seccomp_init_siginfo(kernel_siginfo_t *info, int syscall, int reason)
{
clear_siginfo(info);
info->si_signo = SIGSYS;
info->si_code = SYS_SECCOMP;
info->si_call_addr = (void __user *)KSTK_EIP(current);
info->si_errno = reason;
info->si_arch = syscall_get_arch(current);
info->si_syscall = syscall;
}
/**
* seccomp_send_sigsys - signals the task to allow in-process syscall emulation
* @syscall: syscall number to send to userland
* @reason: filter-supplied reason code to send to userland (via si_errno)
*
* Forces a SIGSYS with a code of SYS_SECCOMP and related sigsys info.
*/
static void seccomp_send_sigsys(int syscall, int reason)
{
struct kernel_siginfo info;
seccomp_init_siginfo(&info, syscall, reason);
force_sig_info(&info);
}
#endif /* CONFIG_SECCOMP_FILTER */
/* For use with seccomp_actions_logged */
@ -1218,7 +1194,7 @@ static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd,
/* Show the handler the original registers. */
syscall_rollback(current, current_pt_regs());
/* Let the filter pass back 16 bits of data. */
seccomp_send_sigsys(this_syscall, data);
force_sig_seccomp(this_syscall, data, false);
goto skip;
case SECCOMP_RET_TRACE:
@ -1288,19 +1264,15 @@ static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd,
seccomp_log(this_syscall, SIGSYS, action, true);
/* Dump core only if this is the last remaining thread. */
if (action != SECCOMP_RET_KILL_THREAD ||
get_nr_threads(current) == 1) {
kernel_siginfo_t info;
(atomic_read(&current->signal->live) == 1)) {
/* Show the original registers in the dump. */
syscall_rollback(current, current_pt_regs());
/* Trigger a manual coredump since do_exit skips it. */
seccomp_init_siginfo(&info, this_syscall, data);
do_coredump(&info);
}
if (action == SECCOMP_RET_KILL_THREAD)
/* Trigger a coredump with SIGSYS */
force_sig_seccomp(this_syscall, data, true);
} else {
do_exit(SIGSYS);
else
do_group_exit(SIGSYS);
}
return -1; /* skip the syscall go directly to signal handling */
}
unreachable();

30
kernel/signal.c
View File

@ -54,6 +54,7 @@
#include <asm/unistd.h>
#include <asm/siginfo.h>
#include <asm/cacheflush.h>
#include <asm/syscall.h> /* for syscall_get_* */
/*
* SLAB caches for signal bits.
@ -1322,7 +1323,7 @@ int do_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p
* that is why we also clear SIGNAL_UNKILLABLE.
*/
static int
force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t)
force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t, bool sigdfl)
{
unsigned long int flags;
int ret, blocked, ignored;
@ -1333,7 +1334,7 @@ force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t)
action = &t->sighand->action[sig-1];
ignored = action->sa.sa_handler == SIG_IGN;
blocked = sigismember(&t->blocked, sig);
if (blocked || ignored) {
if (blocked || ignored || sigdfl) {
action->sa.sa_handler = SIG_DFL;
if (blocked) {
sigdelset(&t->blocked, sig);
@ -1354,7 +1355,7 @@ force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t)
int force_sig_info(struct kernel_siginfo *info)
{
return force_sig_info_to_task(info, current);
return force_sig_info_to_task(info, current, false);
}
/*
@ -1696,7 +1697,7 @@ int force_sig_fault_to_task(int sig, int code, void __user *addr
info.si_flags = flags;
info.si_isr = isr;
#endif
return force_sig_info_to_task(&info, t);
return force_sig_info_to_task(&info, t, false);
}
int force_sig_fault(int sig, int code, void __user *addr
@ -1798,6 +1799,27 @@ int force_sig_perf(void __user *addr, u32 type, u64 sig_data)
return force_sig_info(&info);
}
/**
* force_sig_seccomp - signals the task to allow in-process syscall emulation
* @syscall: syscall number to send to userland
* @reason: filter-supplied reason code to send to userland (via si_errno)
*
* Forces a SIGSYS with a code of SYS_SECCOMP and related sigsys info.
*/
int force_sig_seccomp(int syscall, int reason, bool force_coredump)
{
struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = SIGSYS;
info.si_code = SYS_SECCOMP;
info.si_call_addr = (void __user *)KSTK_EIP(current);
info.si_errno = reason;
info.si_arch = syscall_get_arch(current);
info.si_syscall = syscall;
return force_sig_info_to_task(&info, current, force_coredump);
}
/* For the crazy architectures that include trap information in
* the errno field, instead of an actual errno value.
*/

1
kernel/sys_ni.c
View File

@ -416,7 +416,6 @@ COND_SYSCALL(epoll_wait);
COND_SYSCALL(recv);
COND_SYSCALL_COMPAT(recv);
COND_SYSCALL(send);
COND_SYSCALL(bdflush);
COND_SYSCALL(uselib);
/* optional: time32 */

2
tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
View File

@ -176,7 +176,7 @@
131 nospu quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 32 personality sys_personality ppc64_personality
136 64 personality ppc64_personality

2
tools/perf/arch/s390/entry/syscalls/syscall.tbl
View File

@ -122,7 +122,7 @@
131 common quotactl sys_quotactl sys_quotactl
132 common getpgid sys_getpgid sys_getpgid
133 common fchdir sys_fchdir sys_fchdir
134 common bdflush sys_bdflush sys_bdflush
134 common bdflush - -
135 common sysfs sys_sysfs sys_sysfs
136 common personality sys_s390_personality sys_s390_personality
137 common afs_syscall - -