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Merge branch 'akpm' (patches from Andrew)

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Merge even more updates from Andrew Morton:

 - a kernel-wide sweep of show_stack()

 - pagetable cleanups

 - abstract out accesses to mmap_sem - prep for mmap_sem scalability work

 - hch's user acess work

Subsystems affected by this patch series: debug, mm/pagemap, mm/maccess,
mm/documentation.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (93 commits)
  include/linux/cache.h: expand documentation over __read_mostly
  maccess: return -ERANGE when probe_kernel_read() fails
  x86: use non-set_fs based maccess routines
  maccess: allow architectures to provide kernel probing directly
  maccess: move user access routines together
  maccess: always use strict semantics for probe_kernel_read
  maccess: remove strncpy_from_unsafe
  tracing/kprobes: handle mixed kernel/userspace probes better
  bpf: rework the compat kernel probe handling
  bpf:bpf_seq_printf(): handle potentially unsafe format string better
  bpf: handle the compat string in bpf_trace_copy_string better
  bpf: factor out a bpf_trace_copy_string helper
  maccess: unify the probe kernel arch hooks
  maccess: remove probe_read_common and probe_write_common
  maccess: rename strnlen_unsafe_user to strnlen_user_nofault
  maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault
  maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault
  maccess: update the top of file comment
  maccess: clarify kerneldoc comments
  maccess: remove duplicate kerneldoc comments
  ...
This commit is contained in:
Linus Torvalds
2020-06-09 09:54:46 -07:00
parent 013b2deba9 4fa7252338
commit a5ad5742f6
941 changed files with 2631 additions and 3713 deletions
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10
kernel/events/core.c
View File

@@ -1316,7 +1316,7 @@ static void put_ctx(struct perf_event_context *ctx)
* perf_event::child_mutex;
* perf_event_context::lock
* perf_event::mmap_mutex
* mmap_sem
* mmap_lock
* perf_addr_filters_head::lock
*
* cpu_hotplug_lock
@@ -3080,7 +3080,7 @@ static int perf_event_stop(struct perf_event *event, int restart)
* pre-existing mappings, called once when new filters arrive via SET_FILTER
* ioctl;
* (2) perf_addr_filters_adjust(): adjusting filters' offsets based on newly
* registered mapping, called for every new mmap(), with mm::mmap_sem down
* registered mapping, called for every new mmap(), with mm::mmap_lock down
* for reading;
* (3) perf_event_addr_filters_exec(): clearing filters' offsets in the process
* of exec.
@@ -9742,7 +9742,7 @@ static void perf_addr_filters_splice(struct perf_event *event,
/*
* Scan through mm's vmas and see if one of them matches the
* @filter; if so, adjust filter's address range.
* Called with mm::mmap_sem down for reading.
* Called with mm::mmap_lock down for reading.
*/
static void perf_addr_filter_apply(struct perf_addr_filter *filter,
struct mm_struct *mm,
@@ -9784,7 +9784,7 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
if (!mm)
goto restart;
down_read(&mm->mmap_sem);
mmap_read_lock(mm);
}
raw_spin_lock_irqsave(&ifh->lock, flags);
@@ -9810,7 +9810,7 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
raw_spin_unlock_irqrestore(&ifh->lock, flags);
if (ifh->nr_file_filters) {
up_read(&mm->mmap_sem);
mmap_read_unlock(mm);
mmput(mm);
}

20
kernel/events/uprobes.c
View File

@@ -457,7 +457,7 @@ static int update_ref_ctr(struct uprobe *uprobe, struct mm_struct *mm,
* @vaddr: the virtual address to store the opcode.
* @opcode: opcode to be written at @vaddr.
*
* Called with mm->mmap_sem held for write.
* Called with mm->mmap_lock held for write.
* Return 0 (success) or a negative errno.
*/
int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
@@ -1054,7 +1054,7 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new)
if (err && is_register)
goto free;
down_write(&mm->mmap_sem);
mmap_write_lock(mm);
vma = find_vma(mm, info->vaddr);
if (!vma || !valid_vma(vma, is_register) ||
file_inode(vma->vm_file) != uprobe->inode)
@@ -1076,7 +1076,7 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new)
}
unlock:
up_write(&mm->mmap_sem);
mmap_write_unlock(mm);
free:
mmput(mm);
info = free_map_info(info);
@@ -1240,7 +1240,7 @@ static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm)
struct vm_area_struct *vma;
int err = 0;
down_read(&mm->mmap_sem);
mmap_read_lock(mm);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
unsigned long vaddr;
loff_t offset;
@@ -1257,7 +1257,7 @@ static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm)
vaddr = offset_to_vaddr(vma, uprobe->offset);
err |= remove_breakpoint(uprobe, mm, vaddr);
}
up_read(&mm->mmap_sem);
mmap_read_unlock(mm);
return err;
}
@@ -1354,7 +1354,7 @@ static int delayed_ref_ctr_inc(struct vm_area_struct *vma)
}
/*
* Called from mmap_region/vma_adjust with mm->mmap_sem acquired.
* Called from mmap_region/vma_adjust with mm->mmap_lock acquired.
*
* Currently we ignore all errors and always return 0, the callers
* can't handle the failure anyway.
@@ -1444,7 +1444,7 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
struct vm_area_struct *vma;
int ret;
if (down_write_killable(&mm->mmap_sem))
if (mmap_write_lock_killable(mm))
return -EINTR;
if (mm->uprobes_state.xol_area) {
@@ -1474,7 +1474,7 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
/* pairs with get_xol_area() */
smp_store_release(&mm->uprobes_state.xol_area, area); /* ^^^ */
fail:
up_write(&mm->mmap_sem);
mmap_write_unlock(mm);
return ret;
}
@@ -2047,7 +2047,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
struct uprobe *uprobe = NULL;
struct vm_area_struct *vma;
down_read(&mm->mmap_sem);
mmap_read_lock(mm);
vma = find_vma(mm, bp_vaddr);
if (vma && vma->vm_start <= bp_vaddr) {
if (valid_vma(vma, false)) {
@@ -2065,7 +2065,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
if (!uprobe && test_and_clear_bit(MMF_RECALC_UPROBES, &mm->flags))
mmf_recalc_uprobes(mm);
up_read(&mm->mmap_sem);
mmap_read_unlock(mm);
return uprobe;
}