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BranchCommit messageAuthorAge
archive/unc-master-3.0P-FP: fix BUG_ON releated to priority inheritanceBjoern Brandenburg13 years
archived-2013.1uncachedev: mmap memory that is not cached by CPUsGlenn Elliott12 years
archived-private-masterMerge branch 'wip-2.6.34' into old-private-masterAndrea Bastoni15 years
archived-semi-partMerge branch 'wip-semi-part' of ssh://cvs/cvs/proj/litmus/repo/litmus2010 int...Andrea Bastoni15 years
demoFurther refinementsJonathan Herman14 years
ecrts-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
ecrts14-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
gpusync-rtss12Final GPUSync implementation.Glenn Elliott12 years
gpusync/stagingRename IKGLP R2DGLP.Glenn Elliott12 years
linux-tipMerge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/p...Linus Torvalds15 years
litmus2008-patch-seriesadd i386 feather-trace implementationBjoern B. Brandenburg16 years
masterPSN-EDF: use inferred_sporadic_job_release_atBjoern Brandenburg9 years
pgmmake it compileGlenn Elliott12 years
prop/litmus-signalsInfrastructure for Litmus signals.Glenn Elliott13 years
prop/robust-tie-breakFixed bug in edf_higher_prio().Glenn Elliott13 years
stagingFix tracepoint compilation errorFelipe Cerqueira13 years
test9/23/2016Namhoon Kim9 years
tracing-develTest kernel tracing events capabilitiesAndrea Bastoni16 years
v2.6.34-with-arm-patchessmsc911x: Add spinlocks around registers accessCatalin Marinas15 years
v2015.1Add ARM syscall def for get_current_budgetBjoern Brandenburg10 years
wip-2011.2-bbbLitmus core: simplify np-section protocolBjoern B. Brandenburg14 years
wip-2011.2-bbb-traceRefactor sched_trace_log_message() -> debug_trace_log_message()Andrea Bastoni14 years
wip-2012.3-gpuSOBLIV draining support for C-EDF.Glenn Elliott12 years
wip-2012.3-gpu-preportpick up last C-RM fileGlenn Elliott12 years
wip-2012.3-gpu-rtss13Fix critical bug in GPU tracker.Glenn Elliott12 years
wip-2012.3-gpu-sobliv-budget-w-ksharkProper sobliv draining and many bug fixes.Glenn Elliott12 years
wip-aedzl-finalMake it easier to compile AEDZL interfaces in liblitmus.Glenn Elliott15 years
wip-aedzl-revisedAdd sched_trace data for Apative EDZLGlenn Elliott15 years
wip-arbit-deadlineFix compilation bug.Glenn Elliott13 years
wip-aux-tasksDescription of refined aux task inheritance.Glenn Elliott13 years
wip-bbbGSN-EDF & Core: improve debug TRACE'ing for NP sectionsBjoern B. Brandenburg14 years
wip-bbb-prio-donuse correct timestampBjoern B. Brandenburg14 years
wip-better-breakImplement hash-based EDF tie-breaking.Glenn Elliott13 years
wip-binary-heapMake C-EDF work with simplified binheap_deleteGlenn Elliott13 years
wip-budgetAdded support for choices in budget policy enforcement.Glenn Elliott15 years
wip-colorSummarize schedulability with final recordJonathan Herman13 years
wip-color-jlhsched_color: Fixed two bugs causing crashing on experiment restart and a rare...Jonathan Herman13 years
wip-d10-hz1000Enable HZ=1000 on District 10Bjoern B. Brandenburg15 years
wip-default-clusteringFeature: Make default C-EDF clustering compile-time configurable.Glenn Elliott15 years
wip-dissipation-jericksoUpdate from 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-dissipation2-jericksoUpdate 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-ecrts14-pgmMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
wip-edf-hsblast tested versionJonathan Herman14 years
wip-edf-osLookup table EDF-osJeremy Erickson12 years
wip-edf-tie-breakMerge branch 'wip-edf-tie-break' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus...Glenn Elliott13 years
wip-edzl-critiqueUse hr_timer's active checks instead of having own flag.Glenn Elliott15 years
wip-edzl-finalImplementation of the EDZL scheduler.Glenn Elliott15 years
wip-edzl-revisedClean up comments.Glenn Elliott15 years
wip-eventsAdded support for tracing arbitrary actions.Jonathan Herman15 years
wip-extra-debugDBG: add additional tracingBjoern B. Brandenburg15 years
wip-fix-switch-jericksoAttempt to fix race condition with plugin switchingJeremy Erickson15 years
wip-fix3sched: show length of runqueue clock deactivation in /proc/sched_debugBjoern B. Brandenburg15 years
wip-fmlp-dequeueImprove FMLP queue management.Glenn Elliott14 years
wip-ft-irq-flagFeather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-gpu-cleanupEnable sched_trace log injection from userspaceGlenn Elliott13 years
wip-gpu-interruptsRemove option for threading of all softirqs.Glenn Elliott14 years
wip-gpu-rtas12Generalized GPU cost predictors + EWMA. (untested)Glenn Elliott13 years
wip-gpu-rtss12Final GPUSync implementation.Glenn Elliott13 years
wip-gpu-rtss12-srpexperimental changes to support GPUs under SRPGlenn Elliott13 years
wip-gpusync-mergeCleanup priority tracking for budget enforcement.Glenn Elliott11 years
wip-ikglpMove RSM and IKGLP imp. to own .c filesGlenn Elliott13 years
wip-k-fmlpMerge branch 'mpi-master' into wip-k-fmlpGlenn Elliott14 years
wip-kernel-coloringAdded recolor syscallNamhoon Kim7 years
wip-kernthreadsKludge work-queue processing into klitirqd.Glenn Elliott15 years
wip-klmirqd-to-auxAllow klmirqd threads to be given names.Glenn Elliott13 years
wip-ksharkMerge branch 'mpi-staging' into wip-ksharkJonathan Herman13 years
wip-litmus-3.2Merge commit 'v3.2' into litmus-stagingAndrea Bastoni13 years
wip-litmus2011.2Cleanup: Coding conformance for affinity stuff.Glenn Elliott14 years
wip-litmus3.0-2011.2Feather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-master-2.6.33-rtAvoid deadlock when switching task policy to BACKGROUND (ugly)Andrea Bastoni15 years
wip-mcRemoved ARM-specific hacks which disabled less common mixed-criticality featu...Jonathan Herman12 years
wip-mc-bipasaMC-EDF addedbipasa chattopadhyay13 years
wip-mc-jericksoSplit C/D queuesJeremy Erickson15 years
wip-mc2-cache-slackManually patched mc^2 related codeMing Yang10 years
wip-mcrit-maccosmeticMac Mollison15 years
wip-merge-3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-merge-v3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-migration-affinityNULL affinity dereference in C-EDF.Glenn Elliott14 years
wip-mmap-uncacheshare branch with othersGlenn Elliott13 years
wip-modechangeRTSS 2017 submissionNamhoon Kim8 years
wip-nested-lockingAppears to be working.Bryan Ward12 years
wip-omlp-gedfFirst implementation of G-OMLP.Glenn Elliott15 years
wip-paiSome cleanup of PAIGlenn Elliott14 years
wip-percore-lib9/21/2016Namhoon Kim9 years
wip-performanceCONFIG_DONT_PREEMPT_ON_TIE: Don't preeempt a scheduled task on priority tie.Glenn Elliott14 years
wip-pgmAdd PGM support to C-FLGlenn Elliott12 years
wip-pgm-splitFirst draft of C-FL-splitNamhoon Kim12 years
wip-pm-ovdAdd preemption-and-migration overhead tracing supportAndrea Bastoni15 years
wip-prio-inhP-EDF updated to use the generic pi framework.Glenn Elliott15 years
wip-prioq-dglBUG FIX: Support DGLs with PRIOQ_MUTEXGlenn Elliott13 years
wip-refactored-gedfGeneralizd architecture for GEDF-style scheduelrs to reduce code redundancy.Glenn Elliott15 years
wip-release-master-fixbugfix: release master CPU must signal task was pickedBjoern B. Brandenburg14 years
wip-robust-tie-breakEDF priority tie-breaks.Glenn Elliott13 years
wip-rt-ksharkMove task time accounting into the complete_job method.Jonathan Herman13 years
wip-rtas12-pgmScheduling of PGM jobs.Glenn Elliott13 years
wip-semi-partFix compile error with newer GCCJeremy Erickson12 years
wip-semi-part-edfos-jericksoUse initial CPU set by clientJeremy Erickson12 years
wip-shared-libTODO: Fix condition checks in replicate_page_move_mapping()Namhoon Kim9 years
wip-shared-lib2RTAS 2017 Submission ver.Namhoon Kim9 years
wip-shared-memInitial commit for shared libraryNamhoon Kim9 years
wip-splitting-jericksoFix release behaviorJeremy Erickson13 years
wip-splitting-omlp-jericksoBjoern's Dissertation Code with Priority DonationJeremy Erickson13 years
wip-stage-binheapAn efficient binary heap implementation.Glenn Elliott13 years
wip-sun-portDynamic memory allocation and clean exit for FeatherTraceChristopher Kenna15 years
wip-timer-tracebugfix: C-EDF, clear scheduled field of the correct CPU upon task_exitAndrea Bastoni15 years
wip-tracepointsAdd kernel-style events for sched_trace_XXX() functionsAndrea Bastoni14 years
 
TagDownloadAuthorAge
2015.1commit 8e51b37822...Bjoern Brandenburg10 years
2013.1commit bcaacec1ca...Glenn Elliott12 years
2012.3commit c158b5fbe4...Jonathan Herman13 years
2012.2commit b53c479a0f...Glenn Elliott13 years
2012.1commit 83b11ea1c6...Bjoern B. Brandenburg14 years
rtas12-mc-beta-expcommit 8e236ee20f...Christopher Kenna14 years
2011.1commit d11808b5c6...Christopher Kenna15 years
v2.6.37-rc4commit e8a7e48bb2...Linus Torvalds15 years
v2.6.37-rc3commit 3561d43fd2...Linus Torvalds15 years
v2.6.37-rc2commit e53beacd23...Linus Torvalds15 years
v2.6.37-rc1commit c8ddb2713c...Linus Torvalds15 years
v2.6.36commit f6f94e2ab1...Linus Torvalds15 years
2010.2commit 5c5456402d...Bjoern B. Brandenburg15 years
v2.6.36-rc8commit cd07202cc8...Linus Torvalds15 years
v2.6.36-rc7commit cb655d0f3d...Linus Torvalds15 years
v2.6.36-rc6commit 899611ee7d...Linus Torvalds15 years
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2010.1commit 7c1ff4c544...Andrea Bastoni15 years
v2.6.34commit e40152ee1e...Linus Torvalds15 years
v2.6.33.4commit 4640b4e7d9...Greg Kroah-Hartman15 years
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v2.6.15-rc3commit 624f54be20...Linus Torvalds20 years
v2.6.15-rc2commit 3bedff1d73...Linus Torvalds20 years
v2.6.15-rc1commit cd52d1ee9a...Linus Torvalds20 years
v2.6.14commit 741b2252a5...Linus Torvalds20 years
v2.6.14-rc5commit 93918e9afc...Linus Torvalds20 years
v2.6.14-rc4commit 907a426179...Linus Torvalds20 years
v2.6.14-rc3commit 1c9426e8a5...Linus Torvalds20 years
v2.6.14-rc2commit 676d55ae30...Linus Torvalds20 years
v2.6.14-rc1commit 2f4ba45a75...Linus Torvalds20 years
v2.6.13commit 02b3e4e2d7...Linus Torvalds20 years
v2.6.13-rc7commit 0572e3da3f...Linus Torvalds20 years
v2.6.13-rc6commit 6fc32179de...Linus Torvalds20 years
v2.6.13-rc5commit 9a351e30d7...Linus Torvalds20 years
v2.6.13-rc4commit 6395352334...Linus Torvalds20 years
v2.6.11tree c39ae07f39...
v2.6.11-treetree c39ae07f39...
v2.6.12commit 9ee1c939d1...
v2.6.12-rc2commit 1da177e4c3...
v2.6.12-rc3commit a2755a80f4...
v2.6.12-rc4commit 88d7bd8cb9...
v2.6.12-rc5commit 2a24ab628a...
v2.6.12-rc6commit 7cef5677ef...
v2.6.13-rc1commit 4c91aedb75...
v2.6.13-rc2commit a18bcb7450...
v2.6.13-rc3commit c32511e271...
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-08 20:17:56 -0400
pan class="hl kwd">add_nommu_region(struct vm_region *region) { struct vm_region *pregion; struct rb_node **p, *parent; validate_nommu_regions(); parent = NULL; p = &nommu_region_tree.rb_node; while (*p) { parent = *p; pregion = rb_entry(parent, struct vm_region, vm_rb); if (region->vm_start < pregion->vm_start) p = &(*p)->rb_left; else if (region->vm_start > pregion->vm_start) p = &(*p)->rb_right; else if (pregion == region) return; else BUG(); } rb_link_node(&region->vm_rb, parent, p); rb_insert_color(&region->vm_rb, &nommu_region_tree); validate_nommu_regions(); } /* * delete a region from the global tree */ static void delete_nommu_region(struct vm_region *region) { BUG_ON(!nommu_region_tree.rb_node); validate_nommu_regions(); rb_erase(&region->vm_rb, &nommu_region_tree); validate_nommu_regions(); } /* * free a contiguous series of pages */ static void free_page_series(unsigned long from, unsigned long to) { for (; from < to; from += PAGE_SIZE) { struct page *page = virt_to_page(from); kdebug("- free %lx", from); atomic_long_dec(&mmap_pages_allocated); if (page_count(page) != 1) kdebug("free page %p: refcount not one: %d", page, page_count(page)); put_page(page); } } /* * release a reference to a region * - the caller must hold the region semaphore for writing, which this releases * - the region may not have been added to the tree yet, in which case vm_top * will equal vm_start */ static void __put_nommu_region(struct vm_region *region) __releases(nommu_region_sem) { kenter("%p{%d}", region, region->vm_usage); BUG_ON(!nommu_region_tree.rb_node); if (--region->vm_usage == 0) { if (region->vm_top > region->vm_start) delete_nommu_region(region); up_write(&nommu_region_sem); if (region->vm_file) fput(region->vm_file); /* IO memory and memory shared directly out of the pagecache * from ramfs/tmpfs mustn't be released here */ if (region->vm_flags & VM_MAPPED_COPY) { kdebug("free series"); free_page_series(region->vm_start, region->vm_top); } kmem_cache_free(vm_region_jar, region); } else { up_write(&nommu_region_sem); } } /* * release a reference to a region */ static void put_nommu_region(struct vm_region *region) { down_write(&nommu_region_sem); __put_nommu_region(region); } /* * update protection on a vma */ static void protect_vma(struct vm_area_struct *vma, unsigned long flags) { #ifdef CONFIG_MPU struct mm_struct *mm = vma->vm_mm; long start = vma->vm_start & PAGE_MASK; while (start < vma->vm_end) { protect_page(mm, start, flags); start += PAGE_SIZE; } update_protections(mm); #endif } /* * add a VMA into a process's mm_struct in the appropriate place in the list * and tree and add to the address space's page tree also if not an anonymous * page * - should be called with mm->mmap_sem held writelocked */ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) { struct vm_area_struct *pvma, *prev; struct address_space *mapping; struct rb_node **p, *parent, *rb_prev; kenter(",%p", vma); BUG_ON(!vma->vm_region); mm->map_count++; vma->vm_mm = mm; protect_vma(vma, vma->vm_flags); /* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; mutex_lock(&mapping->i_mmap_mutex); flush_dcache_mmap_lock(mapping); vma_prio_tree_insert(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); mutex_unlock(&mapping->i_mmap_mutex); } /* add the VMA to the tree */ parent = rb_prev = NULL; p = &mm->mm_rb.rb_node; while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); /* sort by: start addr, end addr, VMA struct addr in that order * (the latter is necessary as we may get identical VMAs) */ if (vma->vm_start < pvma->vm_start) p = &(*p)->rb_left; else if (vma->vm_start > pvma->vm_start) { rb_prev = parent; p = &(*p)->rb_right; } else if (vma->vm_end < pvma->vm_end) p = &(*p)->rb_left; else if (vma->vm_end > pvma->vm_end) { rb_prev = parent; p = &(*p)->rb_right; } else if (vma < pvma) p = &(*p)->rb_left; else if (vma > pvma) { rb_prev = parent; p = &(*p)->rb_right; } else BUG(); } rb_link_node(&vma->vm_rb, parent, p); rb_insert_color(&vma->vm_rb, &mm->mm_rb); /* add VMA to the VMA list also */ prev = NULL; if (rb_prev) prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); __vma_link_list(mm, vma, prev, parent); } /* * delete a VMA from its owning mm_struct and address space */ static void delete_vma_from_mm(struct vm_area_struct *vma) { struct address_space *mapping; struct mm_struct *mm = vma->vm_mm; kenter("%p", vma); protect_vma(vma, 0); mm->map_count--; if (mm->mmap_cache == vma) mm->mmap_cache = NULL; /* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; mutex_lock(&mapping->i_mmap_mutex); flush_dcache_mmap_lock(mapping); vma_prio_tree_remove(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); mutex_unlock(&mapping->i_mmap_mutex); } /* remove from the MM's tree and list */ rb_erase(&vma->vm_rb, &mm->mm_rb); if (vma->vm_prev) vma->vm_prev->vm_next = vma->vm_next; else mm->mmap = vma->vm_next; if (vma->vm_next) vma->vm_next->vm_prev = vma->vm_prev; } /* * destroy a VMA record */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { kenter("%p", vma); if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); if (vma->vm_file) { fput(vma->vm_file); if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); } put_nommu_region(vma->vm_region); kmem_cache_free(vm_area_cachep, vma); } /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_sem at least held readlocked */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma; /* check the cache first */ vma = mm->mmap_cache; if (vma && vma->vm_start <= addr && vma->vm_end > addr) return vma; /* trawl the list (there may be multiple mappings in which addr * resides) */ for (vma = mm->mmap; vma; vma = vma->vm_next) { if (vma->vm_start > addr) return NULL; if (vma->vm_end > addr) { mm->mmap_cache = vma; return vma; } } return NULL; } EXPORT_SYMBOL(find_vma); /* * find a VMA * - we don't extend stack VMAs under NOMMU conditions */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { return find_vma(mm, addr); } /* * expand a stack to a given address * - not supported under NOMMU conditions */ int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } /* * look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr, unsigned long len) { struct vm_area_struct *vma; unsigned long end = addr + len; /* check the cache first */ vma = mm->mmap_cache; if (vma && vma->vm_start == addr && vma->vm_end == end) return vma; /* trawl the list (there may be multiple mappings in which addr * resides) */ for (vma = mm->mmap; vma; vma = vma->vm_next) { if (vma->vm_start < addr) continue; if (vma->vm_start > addr) return NULL; if (vma->vm_end == end) { mm->mmap_cache = vma; return vma; } } return NULL; } /* * determine whether a mapping should be permitted and, if so, what sort of * mapping we're capable of supporting */ static int validate_mmap_request(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *_capabilities) { unsigned long capabilities, rlen; unsigned long reqprot = prot; int ret; /* do the simple checks first */ if (flags & MAP_FIXED) { printk(KERN_DEBUG "%d: Can't do fixed-address/overlay mmap of RAM\n", current->pid); return -EINVAL; } if ((flags & MAP_TYPE) != MAP_PRIVATE && (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; if (!len) return -EINVAL; /* Careful about overflows.. */ rlen = PAGE_ALIGN(len); if (!rlen || rlen > TASK_SIZE) return -ENOMEM; /* offset overflow? */ if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff) return -EOVERFLOW; if (file) { /* validate file mapping requests */ struct address_space *mapping; /* files must support mmap */ if (!file->f_op || !file->f_op->mmap) return -ENODEV; /* work out if what we've got could possibly be shared * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ mapping = file->f_mapping; if (!mapping) mapping = file->f_path.dentry->d_inode->i_mapping; capabilities = 0; if (mapping && mapping->backing_dev_info) capabilities = mapping->backing_dev_info->capabilities; if (!capabilities) { /* no explicit capabilities set, so assume some * defaults */ switch (file->f_path.dentry->d_inode->i_mode & S_IFMT) { case S_IFREG: case S_IFBLK: capabilities = BDI_CAP_MAP_COPY; break; case S_IFCHR: capabilities = BDI_CAP_MAP_DIRECT | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP; break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) capabilities &= ~BDI_CAP_MAP_DIRECT; if (!file->f_op->read) capabilities &= ~BDI_CAP_MAP_COPY; /* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) return -EACCES; if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; if (IS_APPEND(file->f_path.dentry->d_inode) && (file->f_mode & FMODE_WRITE)) return -EACCES; if (locks_verify_locked(file->f_path.dentry->d_inode)) return -EAGAIN; if (!(capabilities & BDI_CAP_MAP_DIRECT)) return -ENODEV; /* we mustn't privatise shared mappings */ capabilities &= ~BDI_CAP_MAP_COPY; } else { /* we're going to read the file into private memory we * allocate */ if (!(capabilities & BDI_CAP_MAP_COPY)) return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) capabilities &= ~BDI_CAP_MAP_DIRECT; } if (capabilities & BDI_CAP_MAP_DIRECT) { if (((prot & PROT_READ) && !(capabilities & BDI_CAP_READ_MAP)) || ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) || ((prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP)) ) { capabilities &= ~BDI_CAP_MAP_DIRECT; if (flags & MAP_SHARED) { printk(KERN_WARNING "MAP_SHARED not completely supported on !MMU\n"); return -EINVAL; } } } /* handle executable mappings and implied executable * mappings */ if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { if (prot & PROT_EXEC) return -EPERM; } else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { /* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { if (capabilities & BDI_CAP_EXEC_MAP) prot |= PROT_EXEC; } } else if ((prot & PROT_READ) && (prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP) ) { /* backing file is not executable, try to copy */ capabilities &= ~BDI_CAP_MAP_DIRECT; } } else { /* anonymous mappings are always memory backed and can be * privately mapped */ capabilities = BDI_CAP_MAP_COPY; /* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) prot |= PROT_EXEC; } /* allow the security API to have its say */ ret = security_file_mmap(file, reqprot, prot, flags, addr, 0); if (ret < 0) return ret; /* looks okay */ *_capabilities = capabilities; return 0; } /* * we've determined that we can make the mapping, now translate what we * now know into VMA flags */ static unsigned long determine_vm_flags(struct file *file, unsigned long prot, unsigned long flags, unsigned long capabilities) { unsigned long vm_flags; vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags); /* vm_flags |= mm->def_flags; */ if (!(capabilities & BDI_CAP_MAP_DIRECT)) { /* attempt to share read-only copies of mapped file chunks */ vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; } else { /* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ vm_flags |= VM_MAYSHARE | (capabilities & BDI_CAP_VMFLAGS); if (flags & MAP_SHARED) vm_flags |= VM_SHARED; } /* refuse to let anyone share private mappings with this process if * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ if ((flags & MAP_PRIVATE) && tracehook_expect_breakpoints(current)) vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* * set up a shared mapping on a file (the driver or filesystem provides and * pins the storage) */ static int do_mmap_shared_file(struct vm_area_struct *vma) { int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; return 0; } if (ret != -ENOSYS) return ret; /* getting -ENOSYS indicates that direct mmap isn't possible (as * opposed to tried but failed) so we can only give a suitable error as * it's not possible to make a private copy if MAP_SHARED was given */ return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, unsigned long len, unsigned long capabilities) { struct page *pages; unsigned long total, point, n; void *base; int ret, order; /* invoke the file's mapping function so that it can keep track of * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ if (capabilities & BDI_CAP_MAP_DIRECT) { ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret == 0) { /* shouldn't return success if we're not sharing */ BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; return 0; } if (ret != -ENOSYS) return ret; /* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll try to * make a private copy of the data and map that instead */ } /* allocate some memory to hold the mapping * - note that this may not return a page-aligned address if the object * we're allocating is smaller than a page */ order = get_order(len); kdebug("alloc order %d for %lx", order, len); pages = alloc_pages(GFP_KERNEL, order); if (!pages) goto enomem; total = 1 << order; atomic_long_add(total, &mmap_pages_allocated); point = len >> PAGE_SHIFT; /* we allocated a power-of-2 sized page set, so we may want to trim off * the excess */ if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) { while (total > point) { order = ilog2(total - point); n = 1 << order; kdebug("shave %lu/%lu @%lu", n, total - point, total); atomic_long_sub(n, &mmap_pages_allocated); total -= n; set_page_refcounted(pages + total); __free_pages(pages + total, order); } } for (point = 1; point < total; point++) set_page_refcounted(&pages[point]); base = page_address(pages); region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY; region->vm_start = (unsigned long) base; region->vm_end = region->vm_start + len; region->vm_top = region->vm_start + (total << PAGE_SHIFT); vma->vm_start = region->vm_start; vma->vm_end = region->vm_start + len; if (vma->vm_file) { /* read the contents of a file into the copy */ mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; old_fs = get_fs(); set_fs(KERNEL_DS); ret = vma->vm_file->f_op->read(vma->vm_file, base, len, &fpos); set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ if (ret < len) memset(base + ret, 0, len - ret); } return 0; error_free: free_page_series(region->vm_start, region->vm_top); region->vm_start = vma->vm_start = 0; region->vm_end = vma->vm_end = 0; region->vm_top = 0; return ret; enomem: printk("Allocation of length %lu from process %d (%s) failed\n", len, current->pid, current->comm); show_free_areas(0); return -ENOMEM; } /* * handle mapping creation for uClinux */ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff) { struct vm_area_struct *vma; struct vm_region *region; struct rb_node *rb; unsigned long capabilities, vm_flags, result; int ret; kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); /* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, &capabilities); if (ret < 0) { kleave(" = %d [val]", ret); return ret; } /* we ignore the address hint */ addr = 0; len = PAGE_ALIGN(len); /* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ vm_flags = determine_vm_flags(file, prot, flags, capabilities); /* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); if (!region) goto error_getting_region; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) goto error_getting_vma; region->vm_usage = 1; region->vm_flags = vm_flags; region->vm_pgoff = pgoff; INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; if (file) { region->vm_file = file; get_file(file); vma->vm_file = file; get_file(file); if (vm_flags & VM_EXECUTABLE) { added_exe_file_vma(current->mm); vma->vm_mm = current->mm; } } down_write(&nommu_region_sem); /* if we want to share, we need to check for regions created by other * mmap() calls that overlap with our proposed mapping * - we can only share with a superset match on most regular files * - shared mappings on character devices and memory backed files are * permitted to overlap inexactly as far as we are concerned for in * these cases, sharing is handled in the driver or filesystem rather * than here */ if (vm_flags & VM_MAYSHARE) { struct vm_region *pregion; unsigned long pglen, rpglen, pgend, rpgend, start; pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pgend = pgoff + pglen; for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) { pregion = rb_entry(rb, struct vm_region, vm_rb); if (!(pregion->vm_flags & VM_MAYSHARE)) continue; /* search for overlapping mappings on the same file */ if (pregion->vm_file->f_path.dentry->d_inode != file->f_path.dentry->d_inode) continue; if (pregion->vm_pgoff >= pgend) continue; rpglen = pregion->vm_end - pregion->vm_start; rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT; rpgend = pregion->vm_pgoff + rpglen; if (pgoff >= rpgend) continue; /* handle inexactly overlapping matches between * mappings */ if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ if (!(capabilities & BDI_CAP_MAP_DIRECT)) goto sharing_violation; continue; } /* we've found a region we can share */ pregion->vm_usage++; vma->vm_region = pregion; start = pregion->vm_start; start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT; vma->vm_start = start; vma->vm_end = start + len; if (pregion->vm_flags & VM_MAPPED_COPY) { kdebug("share copy"); vma->vm_flags |= VM_MAPPED_COPY; } else { kdebug("share mmap"); ret = do_mmap_shared_file(vma); if (ret < 0) { vma->vm_region = NULL; vma->vm_start = 0; vma->vm_end = 0; pregion->vm_usage--; pregion = NULL; goto error_just_free; } } fput(region->vm_file); kmem_cache_free(vm_region_jar, region); region = pregion; result = start; goto share; } /* obtain the address at which to make a shared mapping * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ if (capabilities & BDI_CAP_MAP_DIRECT) { addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); if (IS_ERR_VALUE(addr)) { ret = addr; if (ret != -ENOSYS) goto error_just_free; /* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ ret = -ENODEV; if (!(capabilities & BDI_CAP_MAP_COPY)) goto error_just_free; capabilities &= ~BDI_CAP_MAP_DIRECT; } else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; } } } vma->vm_region = region; /* set up the mapping * - the region is filled in if BDI_CAP_MAP_DIRECT is still set */ if (file && vma->vm_flags & VM_SHARED) ret = do_mmap_shared_file(vma); else ret = do_mmap_private(vma, region, len, capabilities); if (ret < 0) goto error_just_free; add_nommu_region(region); /* clear anonymous mappings that don't ask for uninitialized data */ if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); /* okay... we have a mapping; now we have to register it */ result = vma->vm_start; current->mm->total_vm += len >> PAGE_SHIFT; share: add_vma_to_mm(current->mm, vma); /* we flush the region from the icache only when the first executable * mapping of it is made */ if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) { flush_icache_range(region->vm_start, region->vm_end); region->vm_icache_flushed = true; } up_write(&nommu_region_sem); kleave(" = %lx", result); return result; error_just_free: up_write(&nommu_region_sem); error: if (region->vm_file) fput(region->vm_file); kmem_cache_free(vm_region_jar, region); if (vma->vm_file) fput(vma->vm_file); if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(vma->vm_mm); kmem_cache_free(vm_area_cachep, vma); kleave(" = %d", ret); return ret; sharing_violation: up_write(&nommu_region_sem); printk(KERN_WARNING "Attempt to share mismatched mappings\n"); ret = -EINVAL; goto error; error_getting_vma: kmem_cache_free(vm_region_jar, region); printk(KERN_WARNING "Allocation of vma for %lu byte allocation" " from process %d failed\n", len, current->pid); show_free_areas(0); return -ENOMEM; error_getting_region: printk(KERN_WARNING "Allocation of vm region for %lu byte allocation" " from process %d failed\n", len, current->pid); show_free_areas(0); return -ENOMEM; } EXPORT_SYMBOL(do_mmap_pgoff); SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; unsigned long retval = -EBADF; audit_mmap_fd(fd, flags); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); down_write(&current->mm->mmap_sem); retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(&current->mm->mmap_sem); if (file) fput(file); out: return retval; } #ifdef __ARCH_WANT_SYS_OLD_MMAP struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) { struct mmap_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; if (a.offset & ~PAGE_MASK) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ /* * split a vma into two pieces at address 'addr', a new vma is allocated either * for the first part or the tail. */ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) { struct vm_area_struct *new; struct vm_region *region; unsigned long npages; kenter(""); /* we're only permitted to split anonymous regions (these should have * only a single usage on the region) */ if (vma->vm_file) return -ENOMEM; if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL); if (!region) return -ENOMEM; new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) { kmem_cache_free(vm_region_jar, region); return -ENOMEM; } /* most fields are the same, copy all, and then fixup */ *new = *vma; *region = *vma->vm_region; new->vm_region = region; npages = (addr - vma->vm_start) >> PAGE_SHIFT; if (new_below) { region->vm_top = region->vm_end = new->vm_end = addr; } else { region->vm_start = new->vm_start = addr; region->vm_pgoff = new->vm_pgoff += npages; } if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); delete_vma_from_mm(vma); down_write(&nommu_region_sem); delete_nommu_region(vma->vm_region); if (new_below) { vma->vm_region->vm_start = vma->vm_start = addr; vma->vm_region->vm_pgoff = vma->vm_pgoff += npages; } else { vma->vm_region->vm_end = vma->vm_end = addr; vma->vm_region->vm_top = addr; } add_nommu_region(vma->vm_region); add_nommu_region(new->vm_region); up_write(&nommu_region_sem); add_vma_to_mm(mm, vma); add_vma_to_mm(mm, new); return 0; } /* * shrink a VMA by removing the specified chunk from either the beginning or * the end */ static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to) { struct vm_region *region; kenter(""); /* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ delete_vma_from_mm(vma); if (from > vma->vm_start) vma->vm_end = from; else vma->vm_start = to; add_vma_to_mm(mm, vma); /* cut the backing region down to size */ region = vma->vm_region; BUG_ON(region->vm_usage != 1); down_write(&nommu_region_sem); delete_nommu_region(region); if (from > region->vm_start) { to = region->vm_top; region->vm_top = region->vm_end = from; } else { region->vm_start = to; } add_nommu_region(region); up_write(&nommu_region_sem); free_page_series(from, to); return 0; } /* * release a mapping * - under NOMMU conditions the chunk to be unmapped must be backed by a single * VMA, though it need not cover the whole VMA */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; unsigned long end; int ret; kenter(",%lx,%zx", start, len); len = PAGE_ALIGN(len); if (len == 0) return -EINVAL; end = start + len; /* find the first potentially overlapping VMA */ vma = find_vma(mm, start); if (!vma) { static int limit = 0; if (limit < 5) { printk(KERN_WARNING "munmap of memory not mmapped by process %d" " (%s): 0x%lx-0x%lx\n", current->pid, current->comm, start, start + len - 1); limit++; } return -EINVAL; } /* we're allowed to split an anonymous VMA but not a file-backed one */ if (vma->vm_file) { do { if (start > vma->vm_start) { kleave(" = -EINVAL [miss]"); return -EINVAL; } if (end == vma->vm_end) goto erase_whole_vma; vma = vma->vm_next; } while (vma); kleave(" = -EINVAL [split file]"); return -EINVAL; } else { /* the chunk must be a subset of the VMA found */ if (start == vma->vm_start && end == vma->vm_end) goto erase_whole_vma; if (start < vma->vm_start || end > vma->vm_end) { kleave(" = -EINVAL [superset]"); return -EINVAL; } if (start & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned start]"); return -EINVAL; } if (end != vma->vm_end && end & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned split]"); return -EINVAL; } if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); if (ret < 0) { kleave(" = %d [split]", ret); return ret; } } return shrink_vma(mm, vma, start, end); } erase_whole_vma: delete_vma_from_mm(vma); delete_vma(mm, vma); kleave(" = 0"); return 0; } EXPORT_SYMBOL(do_munmap); SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) { int ret; struct mm_struct *mm = current->mm; down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } /* * release all the mappings made in a process's VM space */ void exit_mmap(struct mm_struct *mm) { struct vm_area_struct *vma; if (!mm) return; kenter(""); mm->total_vm = 0; while ((vma = mm->mmap)) { mm->mmap = vma->vm_next; delete_vma_from_mm(vma); delete_vma(mm, vma); cond_resched(); } kleave(""); } unsigned long do_brk(unsigned long addr, unsigned long len) { return -ENOMEM; } /* * expand (or shrink) an existing mapping, potentially moving it at the same * time (controlled by the MREMAP_MAYMOVE flag and available VM space) * * under NOMMU conditions, we only permit changing a mapping's size, and only * as long as it stays within the region allocated by do_mmap_private() and the * block is not shareable * * MREMAP_FIXED is not supported under NOMMU conditions */ unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { struct vm_area_struct *vma; /* insanity checks first */ old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); if (old_len == 0 || new_len == 0) return (unsigned long) -EINVAL; if (addr & ~PAGE_MASK) return -EINVAL; if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; vma = find_vma_exact(current->mm, addr, old_len); if (!vma) return (unsigned long) -EINVAL; if (vma->vm_end != vma->vm_start + old_len) return (unsigned long) -EFAULT; if (vma->vm_flags & VM_MAYSHARE) return (unsigned long) -EPERM; if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start) return (unsigned long) -ENOMEM; /* all checks complete - do it */ vma->vm_end = vma->vm_start + new_len; return vma->vm_start; } EXPORT_SYMBOL(do_mremap); SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) { unsigned long ret; down_write(&current->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(&current->mm->mmap_sem); return ret; } struct page *follow_page(struct vm_area_struct *vma, unsigned long address, unsigned int foll_flags) { return NULL; } int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot) { if (addr != (pfn << PAGE_SHIFT)) return -EINVAL; vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; return 0; } EXPORT_SYMBOL(remap_pfn_range); int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { unsigned int size = vma->vm_end - vma->vm_start; if (!(vma->vm_flags & VM_USERMAP)) return -EINVAL; vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT)); vma->vm_end = vma->vm_start + size; return 0; } EXPORT_SYMBOL(remap_vmalloc_range); unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } void arch_unmap_area(struct mm_struct *mm, unsigned long addr) { } void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } EXPORT_SYMBOL(unmap_mapping_range); /* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. * * We currently support three overcommit policies, which are set via the * vm.overcommit_memory sysctl. See Documentation/vm/overcommit-accounting * * Strict overcommit modes added 2002 Feb 26 by Alan Cox. * Additional code 2002 Jul 20 by Robert Love. * * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise. * * Note this is a helper function intended to be used by LSMs which * wish to use this logic. */ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) { unsigned long free, allowed; vm_acct_memory(pages); /* * Sometimes we want to use more memory than we have */ if (sysctl_overcommit_memory == OVERCOMMIT_ALWAYS) return 0; if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) { unsigned long n; free = global_page_state(NR_FILE_PAGES); free += nr_swap_pages; /* * Any slabs which are created with the * SLAB_RECLAIM_ACCOUNT flag claim to have contents * which are reclaimable, under pressure. The dentry * cache and most inode caches should fall into this */ free += global_page_state(NR_SLAB_RECLAIMABLE); /* * Leave the last 3% for root */ if (!cap_sys_admin) free -= free / 32; if (free > pages) return 0; /* * nr_free_pages() is very expensive on large systems, * only call if we're about to fail. */ n = nr_free_pages(); /* * Leave reserved pages. The pages are not for anonymous pages. */ if (n <= totalreserve_pages) goto error; else n -= totalreserve_pages; /* * Leave the last 3% for root */ if (!cap_sys_admin) n -= n / 32; free += n; if (free > pages) return 0; goto error; } allowed = totalram_pages * sysctl_overcommit_ratio / 100; /* * Leave the last 3% for root */ if (!cap_sys_admin) allowed -= allowed / 32; allowed += total_swap_pages; /* Don't let a single process grow too big: leave 3% of the size of this process for other processes */ if (mm) allowed -= mm->total_vm / 32; if (percpu_counter_read_positive(&vm_committed_as) < allowed) return 0; error: vm_unacct_memory(pages); return -ENOMEM; } int in_gate_area_no_mm(unsigned long addr) { return 0; } int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { BUG(); return 0; } EXPORT_SYMBOL(filemap_fault); static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { struct vm_area_struct *vma; down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ vma = find_vma(mm, addr); if (vma) { /* don't overrun this mapping */ if (addr + len >= vma->vm_end) len = vma->vm_end - addr; /* only read or write mappings where it is permitted */ if (write && vma->vm_flags & VM_MAYWRITE) copy_to_user_page(vma, NULL, addr, (void *) addr, buf, len); else if (!write && vma->vm_flags & VM_MAYREAD) copy_from_user_page(vma, NULL, addr, buf, (void *) addr, len); else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); return len; } /** * @access_remote_vm - access another process' address space * @mm: the mm_struct of the target address space * @addr: start address to access * @buf: source or destination buffer * @len: number of bytes to transfer * @write: whether the access is a write * * The caller must hold a reference on @mm. */ int access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { return __access_remote_vm(NULL, mm, addr, buf, len, write); } /* * Access another process' address space. * - source/target buffer must be kernel space */ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) { struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; len = __access_remote_vm(tsk, mm, addr, buf, len, write); mmput(mm); return len; } /** * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode * @inode: The inode to check * @size: The current filesize of the inode * @newsize: The proposed filesize of the inode * * Check the shared mappings on an inode on behalf of a shrinking truncate to * make sure that that any outstanding VMAs aren't broken and then shrink the * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't * automatically grant mappings that are too large. */ int nommu_shrink_inode_mappings(struct inode *inode, size_t size, size_t newsize) { struct vm_area_struct *vma; struct prio_tree_iter iter; struct vm_region *region; pgoff_t low, high; size_t r_size, r_top; low = newsize >> PAGE_SHIFT; high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); mutex_lock(&inode->i_mapping->i_mmap_mutex); /* search for VMAs that fall within the dead zone */ vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap, low, high) { /* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { mutex_unlock(&inode->i_mapping->i_mmap_mutex); up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } } /* reduce any regions that overlap the dead zone - if in existence, * these will be pointed to by VMAs that don't overlap the dead zone * * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { if (!(vma->vm_flags & VM_SHARED)) continue; region = vma->vm_region; r_size = region->vm_top - region->vm_start; r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size; if (r_top > newsize) { region->vm_top -= r_top - newsize; if (region->vm_end > region->vm_top) region->vm_end = region->vm_top; } } mutex_unlock(&inode->i_mapping->i_mmap_mutex); up_write(&nommu_region_sem); return 0; }
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-08 20:17:56 -0400