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* [PATCH] vfs: add lock owner argument to flush operationMiklos Szeredi2006-06-23
* [PATCH] remove unused o_flags from do_shmatHugh Dickins2006-06-23
* [PATCH] VFS: Permit filesystem to override root dentry on mountDavid Howells2006-06-23
* [PATCH] Audit of POSIX Message Queue Syscalls v.2George C. Wilson2006-06-20
* [PATCH] update of IPC audit record cleanupLinda Knippers2006-06-20
* [PATCH] Rework of IPC auditingSteve Grubb2006-05-01
* [PATCH] IPC: access to unmapped vmalloc area in grow_ary()Alexey Kuznetsov2006-04-17
* [PATCH] shmat: stop mprotect from giving write permission to a readonly attac...Hugh Dickins2006-04-17
* BUG_ON() Conversion in ipc/shm.cEric Sesterhenn2006-04-02
* BUG_ON() Conversion in ipc/util.cEric Sesterhenn2006-03-31
* [PATCH] mqueue comment typo fixSerge E. Hallyn2006-03-28
* [PATCH] one ipc/sem.c->mutex.c converstion too many..Manfred Spraul2006-03-26
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivialLinus Torvalds2006-03-26
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| * BUG_ON() Conversion in ipc/sem.cEric Sesterhenn2006-03-26
* | [PATCH] sem2mutex: ipc, id.semIngo Molnar2006-03-26
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* Merge branch 'audit.b3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro...Linus Torvalds2006-03-25
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| * [PATCH] Capture selinux subject/object context information.Dustin Kirkland2006-03-20
* | BUG_ON() Conversion in ipc/msg.cEric Sesterhenn2006-03-24
* | [PATCH] shmdt: check address alignmentHugh Dickins2006-03-24
* | Remove superfluous NOTIFY_COOKIE_LEN defineMichal Wronski2006-03-21
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* [PATCH] shmdt cannot detach not-alined shm segment cleanly.KAMEZAWA Hiroyuki2006-02-10
* [NETLINK]: Fix a severe bugAlexey Kuznetsov2006-02-09
* correct email address of Manfred SpraulChristian Kujau2006-01-14
* [PATCH] Fix double decrement of mqueue_mnt->mnt_count in sys_mq_openAlexander Viro2006-01-14
* [PATCH] move capable() to capability.hRandy.Dunlap2006-01-11
* [PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_semJes Sorensen2006-01-09
* [PATCH] ipc: expand shm_flagsAndrew Morton2006-01-08
* [PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMUDavid Howells2006-01-06
* Fix silly typo ("smb" vs "smp")Linus Torvalds2005-12-24
* [PATCH] add missing memory barriers to ipc/sem.cManfred Spraul2005-12-24
* Merge master.kernel.org:/pub/scm/linux/kernel/git/bunk/trivialLinus Torvalds2005-11-07
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| * Update Michal Wronski contact infoMichal Wronski2005-11-06
* | [PATCH] more kernel-doc cleanups, additionsRandy Dunlap2005-11-07
* | [PATCH] SHM_NORESERVE flags for shmget()Badari Pulavarty2005-11-07
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* [PATCH] hugetlb: remove repeated codeKrishnakumar R2005-10-30
* [PATCH] Make POSIX message queue sys_mq_open() honor umaskKrzysztof Benedyczak2005-09-27
* [PATCH] merge some from Rusty's trivial patchesAdrian Bunk2005-09-10
* [PATCH] ipc: convert /proc/sysvipc/* to generic seq_file interfaceMike Waychison2005-09-07
* [PATCH] ipc: add generic struct ipc_ids seq_file iterationMike Waychison2005-09-07
* [PATCH] compat: be more consistent about [ug]id_tStephen Rothwell2005-09-07
* [PATCH] Fix semundo lock leakageIngo Molnar2005-08-05
* [PATCH] shm: CONFIG_SHMEM=n build fixAndrew Morton2005-08-02
* [PATCH] xtensa: remove old syscallsChris Zankel2005-07-12
* [PATCH] put_compat_shminfo() warning fixJesse Millan2005-07-07
* [PATCH] ipcsem: remove superflous decrease variable from sys_semtimedopManfred Spraul2005-06-23
* [PATCH] convert that currently tests _NSIG directly to use valid_signal()Jesper Juhl2005-05-01
* [PATCH] consolidate sys_shmatStephen Rothwell2005-05-01
* [PATCH] use smp_mb/wmb/rmb where possibleakpm@osdl.org2005-05-01
* Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds2005-04-16
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-08 14:53:20 -0400
if the * process never used altivec yet (MSR_VEC is zero in pt_regs of * the context). This is very important because we must ensure we * don't lose the VRSAVE content that may have been set prior to * the process doing its first vector operation * Userland shall check AT_HWCAP to know wether it can rely on the * v_regs pointer or not */ #ifdef CONFIG_ALTIVEC elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful); #endif unsigned long msr = regs->msr; long err = 0; flush_fp_to_thread(current); #ifdef CONFIG_ALTIVEC err |= __put_user(v_regs, &sc->v_regs); /* save altivec registers */ if (current->thread.used_vr) { flush_altivec_to_thread(current); /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128)); /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg) * contains valid data. */ msr |= MSR_VEC; } /* We always copy to/from vrsave, it's 0 if we don't have or don't * use altivec. */ err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]); #else /* CONFIG_ALTIVEC */ err |= __put_user(0, &sc->v_regs); #endif /* CONFIG_ALTIVEC */ flush_fp_to_thread(current); /* copy fpr regs and fpscr */ err |= copy_fpr_to_user(&sc->fp_regs, current); #ifdef CONFIG_VSX /* * Copy VSX low doubleword to local buffer for formatting, * then out to userspace. Update v_regs to point after the * VMX data. */ if (current->thread.used_vsr && ctx_has_vsx_region) { __giveup_vsx(current); v_regs += ELF_NVRREG; err |= copy_vsx_to_user(v_regs, current); /* set MSR_VSX in the MSR value in the frame to * indicate that sc->vs_reg) contains valid data. */ msr |= MSR_VSX; } #endif /* CONFIG_VSX */ err |= __put_user(&sc->gp_regs, &sc->regs); WARN_ON(!FULL_REGS(regs)); err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE); err |= __put_user(msr, &sc->gp_regs[PT_MSR]); err |= __put_user(signr, &sc->signal); err |= __put_user(handler, &sc->handler); if (set != NULL) err |= __put_user(set->sig[0], &sc->oldmask); return err; } /* * Restore the sigcontext from the signal frame. */ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig, struct sigcontext __user *sc) { #ifdef CONFIG_ALTIVEC elf_vrreg_t __user *v_regs; #endif unsigned long err = 0; unsigned long save_r13 = 0; unsigned long msr; #ifdef CONFIG_VSX int i; #endif /* If this is not a signal return, we preserve the TLS in r13 */ if (!sig) save_r13 = regs->gpr[13]; /* copy the GPRs */ err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr)); err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]); /* get MSR separately, transfer the LE bit if doing signal return */ err |= __get_user(msr, &sc->gp_regs[PT_MSR]); if (sig) regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]); err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]); err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]); err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]); err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]); /* skip SOFTE */ regs->trap = 0; err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]); err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]); err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]); if (!sig) regs->gpr[13] = save_r13; if (set != NULL) err |= __get_user(set->sig[0], &sc->oldmask); /* * Do this before updating the thread state in * current->thread.fpr/vr. That way, if we get preempted * and another task grabs the FPU/Altivec, it won't be * tempted to save the current CPU state into the thread_struct * and corrupt what we are writing there. */ discard_lazy_cpu_state(); /* * Force reload of FP/VEC. * This has to be done before copying stuff into current->thread.fpr/vr * for the reasons explained in the previous comment. */ regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX); #ifdef CONFIG_ALTIVEC err |= __get_user(v_regs, &sc->v_regs); if (err) return err; if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128))) return -EFAULT; /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ if (v_regs != 0 && (msr & MSR_VEC) != 0) err |= __copy_from_user(current->thread.vr, v_regs, 33 * sizeof(vector128)); else if (current->thread.used_vr) memset(current->thread.vr, 0, 33 * sizeof(vector128)); /* Always get VRSAVE back */ if (v_regs != 0) err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]); else current->thread.vrsave = 0; #endif /* CONFIG_ALTIVEC */ /* restore floating point */ err |= copy_fpr_from_user(current, &sc->fp_regs); #ifdef CONFIG_VSX /* * Get additional VSX data. Update v_regs to point after the * VMX data. Copy VSX low doubleword from userspace to local * buffer for formatting, then into the taskstruct. */ v_regs += ELF_NVRREG; if ((msr & MSR_VSX) != 0) err |= copy_vsx_from_user(current, v_regs); else for (i = 0; i < 32 ; i++) current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; #endif return err; } /* * Setup the trampoline code on the stack */ static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp) { int i; long err = 0; /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */ err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]); /* li r0, __NR_[rt_]sigreturn| */ err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]); /* sc */ err |= __put_user(0x44000002UL, &tramp[2]); /* Minimal traceback info */ for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++) err |= __put_user(0, &tramp[i]); if (!err) flush_icache_range((unsigned long) &tramp[0], (unsigned long) &tramp[TRAMP_SIZE]); return err; } /* * Userspace code may pass a ucontext which doesn't include VSX added * at the end. We need to check for this case. */ #define UCONTEXTSIZEWITHOUTVSX \ (sizeof(struct ucontext) - 32*sizeof(long)) /* * Handle {get,set,swap}_context operations */ int sys_swapcontext(struct ucontext __user *old_ctx, struct ucontext __user *new_ctx, long ctx_size, long r6, long r7, long r8, struct pt_regs *regs) { unsigned char tmp; sigset_t set; unsigned long new_msr = 0; int ctx_has_vsx_region = 0; if (new_ctx && get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR])) return -EFAULT; /* * Check that the context is not smaller than the original * size (with VMX but without VSX) */ if (ctx_size < UCONTEXTSIZEWITHOUTVSX) return -EINVAL; /* * If the new context state sets the MSR VSX bits but * it doesn't provide VSX state. */ if ((ctx_size < sizeof(struct ucontext)) && (new_msr & MSR_VSX)) return -EINVAL; /* Does the context have enough room to store VSX data? */ if (ctx_size >= sizeof(struct ucontext)) ctx_has_vsx_region = 1; if (old_ctx != NULL) { if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0, ctx_has_vsx_region) || __copy_to_user(&old_ctx->uc_sigmask, &current->blocked, sizeof(sigset_t))) return -EFAULT; } if (new_ctx == NULL) return 0; if (!access_ok(VERIFY_READ, new_ctx, ctx_size) || __get_user(tmp, (u8 __user *) new_ctx) || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) return -EFAULT; /* * If we get a fault copying the context into the kernel's * image of the user's registers, we can't just return -EFAULT * because the user's registers will be corrupted. For instance * the NIP value may have been updated but not some of the * other registers. Given that we have done the access_ok * and successfully read the first and last bytes of the region * above, this should only happen in an out-of-memory situation * or if another thread unmaps the region containing the context. * We kill the task with a SIGSEGV in this situation. */ if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set))) do_exit(SIGSEGV); restore_sigmask(&set); if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext)) do_exit(SIGSEGV); /* This returns like rt_sigreturn */ set_thread_flag(TIF_RESTOREALL); return 0; } /* * Do a signal return; undo the signal stack. */ int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7, unsigned long r8, struct pt_regs *regs) { struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1]; sigset_t set; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; if (!access_ok(VERIFY_READ, uc, sizeof(*uc))) goto badframe; if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set))) goto badframe; restore_sigmask(&set); if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext)) goto badframe; /* do_sigaltstack expects a __user pointer and won't modify * what's in there anyway */ do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]); set_thread_flag(TIF_RESTOREALL); return 0; badframe: #if DEBUG_SIG printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n", regs, uc, &uc->uc_mcontext); #endif if (show_unhandled_signals && printk_ratelimit()) printk(regs->msr & MSR_SF ? fmt64 : fmt32, current->comm, current->pid, "rt_sigreturn", (long)uc, regs->nip, regs->link); force_sig(SIGSEGV, current); return 0; } int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info, sigset_t *set, struct pt_regs *regs) { /* Handler is *really* a pointer to the function descriptor for * the signal routine. The first entry in the function * descriptor is the entry address of signal and the second * entry is the TOC value we need to use. */ func_descr_t __user *funct_desc_ptr; struct rt_sigframe __user *frame; unsigned long newsp = 0; long err = 0; frame = get_sigframe(ka, regs, sizeof(*frame), 0); if (unlikely(frame == NULL)) goto badframe; err |= __put_user(&frame->info, &frame->pinfo); err |= __put_user(&frame->uc, &frame->puc); err |= copy_siginfo_to_user(&frame->info, info); if (err) goto badframe; /* Create the ucontext. */ err |= __put_user(0, &frame->uc.uc_flags); err |= __put_user(0, &frame->uc.uc_link); err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); err |= __put_user(sas_ss_flags(regs->gpr[1]), &frame->uc.uc_stack.ss_flags); err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL, (unsigned long)ka->sa.sa_handler, 1); err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) goto badframe; /* Make sure signal handler doesn't get spurious FP exceptions */ current->thread.fpscr.val = 0; /* Set up to return from userspace. */ if (vdso64_rt_sigtramp && current->mm->context.vdso_base) { regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp; } else { err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]); if (err) goto badframe; regs->link = (unsigned long) &frame->tramp[0]; } funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler; /* Allocate a dummy caller frame for the signal handler. */ newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; err |= put_user(regs->gpr[1], (unsigned long __user *)newsp); /* Set up "regs" so we "return" to the signal handler. */ err |= get_user(regs->nip, &funct_desc_ptr->entry); /* enter the signal handler in big-endian mode */ regs->msr &= ~MSR_LE; regs->gpr[1] = newsp; err |= get_user(regs->gpr[2], &funct_desc_ptr->toc); regs->gpr[3] = signr; regs->result = 0; if (ka->sa.sa_flags & SA_SIGINFO) { err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo); err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc); regs->gpr[6] = (unsigned long) frame; } else { regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext; } if (err) goto badframe; return 1; badframe: #if DEBUG_SIG printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n", regs, frame, newsp); #endif if (show_unhandled_signals && printk_ratelimit()) printk(regs->msr & MSR_SF ? fmt64 : fmt32, current->comm, current->pid, "setup_rt_frame", (long)frame, regs->nip, regs->link); force_sigsegv(signr, current); return 0; }
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-08 14:53:19 -0400