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authorjilles <jilles@FreeBSD.org>2011-06-18 23:01:26 +0000
committerjilles <jilles@FreeBSD.org>2011-06-18 23:01:26 +0000
commit2c34fd40cf9b5ba7ec3d068fc410a06bc897665b (patch)
tree7c00d02027dc5e6f7f889633ba3cc51cb0639dec /lib
parent0164b6b71fa8486340faac5c92102c1e323f148d (diff)
downloadFreeBSD-src-2c34fd40cf9b5ba7ec3d068fc410a06bc897665b.zip
FreeBSD-src-2c34fd40cf9b5ba7ec3d068fc410a06bc897665b.tar.gz
libprocstat: For MAP_PRIVATE, do not consider the file open for writing.
If a file is mapped with with MAP_PRIVATE, no write permission is required and changes do not end up in the file. Therefore, tools like fuser and fstat should not show the file as open for writing. The protection as displayed by procstat -v still includes write in this case, and shows 'C' for copy-on-write.
Diffstat (limited to 'lib')
-rw-r--r--lib/libprocstat/libprocstat.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/libprocstat/libprocstat.c b/lib/libprocstat/libprocstat.c
index 65e170d..22ca668 100644
--- a/lib/libprocstat/libprocstat.c
+++ b/lib/libprocstat/libprocstat.c
@@ -522,7 +522,8 @@ do_mmapped:
fflags = 0;
if (prot & VM_PROT_READ)
fflags = PS_FST_FFLAG_READ;
- if (prot & VM_PROT_WRITE)
+ if ((vmentry.eflags & MAP_ENTRY_COW) == 0 &&
+ prot & VM_PROT_WRITE)
fflags |= PS_FST_FFLAG_WRITE;
/*
@@ -696,7 +697,8 @@ procstat_getfiles_sysctl(struct procstat *procstat, struct kinfo_proc *kp, int m
fflags = 0;
if (kve->kve_protection & KVME_PROT_READ)
fflags = PS_FST_FFLAG_READ;
- if (kve->kve_protection & KVME_PROT_WRITE)
+ if ((kve->kve_flags & KVME_FLAG_COW) == 0 &&
+ kve->kve_protection & KVME_PROT_WRITE)
fflags |= PS_FST_FFLAG_WRITE;
offset = kve->kve_offset;
refcount = kve->kve_ref_count;
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