* + mips-call-find_vma-with-the-mmap_sem-held.patch added to -mm tree
@ 2014-04-21 21:20 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2014-04-21 21:20 UTC (permalink / raw)
To: mm-commits, ralf, davidlohr
Subject: + mips-call-find_vma-with-the-mmap_sem-held.patch added to -mm tree
To: davidlohr@hp.com,ralf@linux-mips.org
From: akpm@linux-foundation.org
Date: Mon, 21 Apr 2014 14:20:43 -0700
The patch titled
Subject: mips: call find_vma with the mmap_sem held
has been added to the -mm tree. Its filename is
mips-call-find_vma-with-the-mmap_sem-held.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mips-call-find_vma-with-the-mmap_sem-held.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mips-call-find_vma-with-the-mmap_sem-held.patch
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------------------------------------------------------
From: Davidlohr Bueso <davidlohr@hp.com>
Subject: mips: call find_vma with the mmap_sem held
Performing vma lookups without taking the mm->mmap_sem is asking for
trouble. While doing the search, the vma in question can be modified or
even removed before returning to the caller. Take the lock (exclusively)
in order to avoid races while iterating through the vmacache and/or
rbtree.
Updates two functions:
- process_fpemu_return()
- cteon_flush_cache_sigtramp()
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/mips/kernel/traps.c | 2 ++
arch/mips/mm/c-octeon.c | 2 ++
2 files changed, 4 insertions(+)
diff -puN arch/mips/kernel/traps.c~mips-call-find_vma-with-the-mmap_sem-held arch/mips/kernel/traps.c
--- a/arch/mips/kernel/traps.c~mips-call-find_vma-with-the-mmap_sem-held
+++ a/arch/mips/kernel/traps.c
@@ -712,10 +712,12 @@ int process_fpemu_return(int sig, void _
si.si_addr = fault_addr;
si.si_signo = sig;
if (sig == SIGSEGV) {
+ down_read(¤t->mm->mmap_sem);
if (find_vma(current->mm, (unsigned long)fault_addr))
si.si_code = SEGV_ACCERR;
else
si.si_code = SEGV_MAPERR;
+ up_read(¤t->mm->mmap_sem);
} else {
si.si_code = BUS_ADRERR;
}
diff -puN arch/mips/mm/c-octeon.c~mips-call-find_vma-with-the-mmap_sem-held arch/mips/mm/c-octeon.c
--- a/arch/mips/mm/c-octeon.c~mips-call-find_vma-with-the-mmap_sem-held
+++ a/arch/mips/mm/c-octeon.c
@@ -137,8 +137,10 @@ static void octeon_flush_cache_sigtramp(
{
struct vm_area_struct *vma;
+ down_read(¤t->mm->mmap_sem);
vma = find_vma(current->mm, addr);
octeon_flush_icache_all_cores(vma);
+ up_read(¤t->mm->mmap_sem);
}
_
Patches currently in -mm which might be from davidlohr@hp.com are
mmvmacache-add-debug-data.patch
mmvmacache-optimize-overflow-system-wide-flushing.patch
mm-pass-vm_bug_on-reason-to-dump_page.patch
mm-pass-vm_bug_on-reason-to-dump_page-fix.patch
hugetlb-prep_compound_gigantic_page-drop-__init-marker.patch
hugetlb-add-hstate_is_gigantic.patch
hugetlb-update_and_free_page-dont-clear-pg_reserved-bit.patch
hugetlb-move-helpers-up-in-the-file.patch
hugetlb-add-support-for-gigantic-page-allocation-at-runtime.patch
blackfin-ptrace-call-find_vma-with-the-mmap_sem-held.patch
m68k-call-find_vma-with-the-mmap_sem-held-in-sys_cacheflush.patch
mips-call-find_vma-with-the-mmap_sem-held.patch
arc-call-find_vma-with-the-mmap_sem-held.patch
driverssgi-gru-grufaultc-call-find_vma-with-the-mmap_sem-held.patch
drm-exynos-call-find_vma-with-the-mmap_sem-held.patch
ipc-constify-ipc_ops.patch
linux-next.patch
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2014-04-21 21:20 + mips-call-find_vma-with-the-mmap_sem-held.patch added to -mm tree akpm
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