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Add patch from Will Woods to fix fanotify EOVERFLOW issue (rhbz 696821)

This commit is contained in:
Josh Boyer 2014-04-25 08:31:16 -04:00
parent f9bc831cd3
commit 4f911d6048
2 changed files with 46 additions and 0 deletions
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39
fanotify-fix-EOVERFLOW-on-64-bit.patch Normal file
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@ -0,0 +1,39 @@
Bugzilla: 696821
Upstream-status: Sent http://marc.info/?l=linux-kernel&m=139835974112096&w=2
On 64-bit systems, O_LARGEFILE is automatically added to flags inside
the open() syscall (also openat(), blkdev_open(), etc).
Userspace therefore defines O_LARGEFILE to be 0 - you can use it,
but it's a no-op. Everything should be O_LARGEFILE by default.
But: when fanotify does create_fd() it uses dentry_open(), which skips
all that. And userspace can't set O_LARGEFILE in fanotify_init() because
it's defined to 0. So if fanotify gets an event regarding a large file,
the read() will just fail with -EOVERFLOW.
This patch adds O_LARGEFILE to fanotify_init()'s event_f_flags on 64-bit
systems, using the same test as open()/openat()/etc.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=696821
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Will Woods <wwoods@redhat.com>
---
fs/notify/fanotify/fanotify_user.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 4e565c8..732648b 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -698,6 +698,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
}
group->overflow_event = &oevent->fse;
+ if (force_o_largefile())
+ event_f_flags |= O_LARGEFILE;
group->fanotify_data.f_flags = event_f_flags;
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
spin_lock_init(&group->fanotify_data.access_lock);
--
1.9.0

7
kernel.spec
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@ -644,6 +644,9 @@ Patch25065: 0001-synaptics-Add-min-max-quirk-for-ThinkPad-Edge-E431.patch
#rhbz 1090746
Patch25067: ACPICA-Tables-Fix-bad-pointer-issue-in-acpi_tb_parse_root_table.patch
#rhbz 696821
Patch25068: fanotify-fix-EOVERFLOW-on-64-bit.patch
# END OF PATCH DEFINITIONS
%endif
@ -1296,6 +1299,9 @@ ApplyPatch 0001-synaptics-Add-min-max-quirk-for-ThinkPad-Edge-E431.patch
#rhbz 1090746
ApplyPatch ACPICA-Tables-Fix-bad-pointer-issue-in-acpi_tb_parse_root_table.patch
#rhbz 696821
ApplyPatch fanotify-fix-EOVERFLOW-on-64-bit.patch
# END OF PATCH APPLICATIONS
%endif
@ -2076,6 +2082,7 @@ fi
# || ||
%changelog
* Fri Apr 25 2014 Josh Boyer <jwboyer@fedoraproject.org>
- Add patch from Will Woods to fix fanotify EOVERFLOW issue (rhbz 696821)
- Fix ACPI issue preventing boot on AMI firmware (rhbz 1090746)
* Fri Apr 25 2014 Hans de Goede <hdegoede@redhat.com>