mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 02:26:44 +07:00
2df7a7d1cd
The bug was accidentally found by the following program:
#include <asm/sysinfo.h>
#include <asm/unistd.h>
#include <sys/syscall.h>
static int setsysinfo(unsigned long op, void *buffer, unsigned long size,
int *start, void *arg, unsigned long flag) {
return syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
}
int main(int argc, char **argv) {
short x[10];
unsigned int buf[2] = { SSIN_UACPROC, UAC_SIGBUS, };
setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
int *y = (int*) (x+1);
*y = 0;
return 0;
}
The program shoud fail on SIGBUS, but didn't.
The patch is a second part of userspace flag fix (commit 745dd2405e
"Alpha: Rearrange thread info flags fixing two regressions").
Deleted outdated out-of-sync 'UAC_SHIFT' (the cause of bug) in favour of
'ALPHA_UAC_SHIFT'.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Acked-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
#ifndef _ALPHA_THREAD_INFO_H
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#define _ALPHA_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/types.h>
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#include <asm/hwrpb.h>
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#endif
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#ifndef __ASSEMBLY__
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struct thread_info {
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struct pcb_struct pcb; /* palcode state */
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struct task_struct *task; /* main task structure */
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unsigned int flags; /* low level flags */
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unsigned int ieee_state; /* see fpu.h */
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struct exec_domain *exec_domain; /* execution domain */
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mm_segment_t addr_limit; /* thread address space */
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unsigned cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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int bpt_nsaved;
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unsigned long bpt_addr[2]; /* breakpoint handling */
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unsigned int bpt_insn[2];
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struct restart_block restart_block;
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};
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/*
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* Macros/functions for gaining access to the thread information structure.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.addr_limit = KERNEL_DS, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* How to get the thread information struct from C. */
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register struct thread_info *__current_thread_info __asm__("$8");
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#define current_thread_info() __current_thread_info
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#endif /* __ASSEMBLY__ */
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/* Thread information allocation. */
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (2*PAGE_SIZE)
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#define PREEMPT_ACTIVE 0x40000000
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/*
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* Thread information flags:
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* - these are process state flags and used from assembly
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* - pending work-to-be-done flags come first and must be assigned to be
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* within bits 0 to 7 to fit in and immediate operand.
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* - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned
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* control flags.
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*
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* TIF_SYSCALL_TRACE is known to be 0 via blbs.
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_POLLING_NRFLAG 8 /* poll_idle is polling NEED_RESCHED */
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#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
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#define TIF_UAC_NOPRINT 10 /* ! Preserve sequence of following */
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#define TIF_UAC_NOFIX 11 /* ! flags as they match */
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#define TIF_UAC_SIGBUS 12 /* ! userspace part of 'osf_sysinfo' */
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#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK 14 /* restore signal mask in do_signal */
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#define TIF_FREEZE 16 /* is freezing for suspend */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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/* Work to do on interrupt/exception return. */
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#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
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_TIF_NOTIFY_RESUME)
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/* Work to do on any return to userspace. */
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#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
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| _TIF_SYSCALL_TRACE)
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#define ALPHA_UAC_SHIFT TIF_UAC_NOPRINT
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#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
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1 << TIF_UAC_SIGBUS)
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#define SET_UNALIGN_CTL(task,value) ({ \
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task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
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~ALPHA_UAC_MASK) \
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| (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
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| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
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| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
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0; })
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#define GET_UNALIGN_CTL(task,value) ({ \
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put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
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>> ALPHA_UAC_SHIFT \
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| (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
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>> (ALPHA_UAC_SHIFT + 1) \
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| (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
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>> (ALPHA_UAC_SHIFT - 1), \
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(int __user *)(value)); \
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})
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#endif /* __KERNEL__ */
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#endif /* _ALPHA_THREAD_INFO_H */
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