The patch titled
sys_times() fix return values
has been removed from the -mm tree. Its filename was
sys_times-fix-return-values.patch
This patch was dropped because it is obsolete
------------------------------------------------------
Subject: sys_times() fix return values
From: Andrew Morton <[EMAIL PROTECTED]>
David Brown points out that compat_sys_times() (and sys_times()) can return
arbitrary 32-bit (or 64-bit values). If these happen to be negative (jiffy
wrap, or before INITIAL_JIFFIES) then libc will interpret this as an error and
will return -1 to the libc user and will set errno.
The manpage for times(2) says:
times() returns the number of clock ticks that have elapsed since an
arbitrary point in the past. For Linux 2.4 and earlier this point is
the moment the system was booted. Since Linux 2.6, this point is
(2^32/HZ) - 300 (i.e., about 429 million) seconds before system boot
time. The return value may overflow the possible range of type
clock_t. On error, (clock_t) -1 is returned, and errno is set appro-
priately.
We can fix this by masking the return value down to a 31-bit (63-bit) value.
Also, let's correct for INTIAL_JIFFIES - this isn't a detail which should be
exposed to userspace.
Unfortunately this change can break userspace. If a program was (correctly)
doing:
unsigned long start = times(...);
...
unsigned long end = times(...);
unsigned long delta = end - start;
then `delta' can be grossly wrong if we wrapped in the interval. Instead
userspace will need to mask `delta' by 0x7fffffff (0x7fffffffffffffff) to get
the correct number.
But userspace was already busted in the presence of wraparound, due to glibc's
convert-to-negative-one behaviour.
Given all this stuff, the return value from sys_times() doesn't seem a
particularly useful or reliable kernel interface.
Cc: David Brown <[EMAIL PROTECTED]>
Cc: Ulrich Drepper <[EMAIL PROTECTED]>
Cc: Michael Kerrisk <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
kernel/compat.c | 3 ++-
kernel/sys.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
diff -puN kernel/sys.c~sys_times-fix-return-values kernel/sys.c
--- a/kernel/sys.c~sys_times-fix-return-values
+++ a/kernel/sys.c
@@ -897,7 +897,8 @@ asmlinkage long sys_times(struct tms __u
if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
return -EFAULT;
}
- return (long) jiffies_64_to_clock_t(get_jiffies_64());
+ return jiffies_64_to_clock_t((get_jiffies_64() + INITIAL_JIFFIES) &
+ LONG_MAX);
}
/*
diff -puN kernel/compat.c~sys_times-fix-return-values kernel/compat.c
--- a/kernel/compat.c~sys_times-fix-return-values
+++ a/kernel/compat.c
@@ -162,7 +162,8 @@ asmlinkage long compat_sys_times(struct
if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
return -EFAULT;
}
- return compat_jiffies_to_clock_t(jiffies);
+ return compat_jiffies_to_clock_t((jiffies + INITIAL_JIFFIES) &
+ LONG_MAX);
}
/*
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
origin.patch
proc-fix-proc_kill_inodes-to-kill-dentries-on-all-proc-superblocks-checkpatch-fixes.patch
acpi-make-acpi_procfs-default-to-y.patch
acpi-enable-c3-power-state-on-dell-inspiron-8200-fix.patch
acpi-add-reboot-mechanism.patch
small-acpica-extension-to-be-able-to-store-the-name-of-fix.patch
git-alsa.patch
working-3d-dri-intel-agpko-resume-for-i815-chip.patch
git-arm.patch
git-arm-fixup.patch
agk-dm-dm-ioctl-move-compat-code-fix.patch
git-hwmon.patch
ia64-slim-down-__clear_bit_unlock-checkpatch-fixes.patch
elantech-touchpad-driver-fix.patch
git-kvm.patch
git-libata-all.patch
drivers-ata-libata-ehc-fix-printk-warning.patch
pata_hpt37x-fix-outstanding-bug-reports-on-the-hpt374-and-37x-cable-detect-checkpatch-fixes.patch
ide-arm-hack.patch
git-mtd-fix.patch
lmc_ioctl-dont-return-with-locks-held-fix.patch
git-netdev-all.patch
ucc_geth-fix-build-break-introduced-by-commit-09f75cd7bf13720738e6a196cc0107ce9a5bd5a0-checkpatch-fixes.patch
update-smc91x-driver-with-arm-versatile-board-info.patch
bluetooth-uninlining.patch
git-nfsd-fixup.patch
quirk_vialatency-omit-reading-pci-revision-id-checkpatch-fixes.patch
fix-build-breakage-if-sysfs-fix.patch
wd7000-broke.patch
ips-trim-trailing-whitespace-checkpatch-fixes.patch
scsi-gdth-kill-unneeded-irq-argument-checkpatch-fixes.patch
scsi-fix-bugs-and-canonicalize-ncr5380_intr-drivers-checkpatch-fixes.patch
git-unionfs.patch
vfs-swap-do_ioctl-and-vfs_ioctl-names-fix.patch
git-wireless.patch
jiffies_round-jiffies_round_relative-conversion-rt2x00-checkpatch-fixes.patch
git-ipwireless-ipwireless_cs_tty-warning-fix.patch
git-x86.patch
git-x86-fixup.patch
oprofile-op_model_athalonc-support-for-amd-family10h-barcelona-performance-counters-checkpatch-fixes.patch
i386-and-x86_64-randomize-brk-fix.patch
x86-arch_register_cpu-section-fix.patch
mips-undo-locking-on-error-path-returns-checkpatch-fixes.patch
pidns-place-under-config_experimental-checkpatch-fixes.patch
fix-64kb-blocksize-in-ext3-directories-checkpatch-fixes.patch
file-capabilities-allow-sigcont-within-session-v2-checkpatch-fixes.patch
x86-disable-preemption-in-delay_tsc.patch
pagecache-zeroing-zero_user_segment-zero_user_segments-and-zero_user-fix.patch
pagecache-zeroing-zero_user_segment-zero_user_segments-and-zero_user-fix-2.patch
i386-resolve-dependency-of-asm-i386-pgtableh-on-highmemh-checkpatch-fixes.patch
slub-fix-coding-style-violations-checkpatch-fixes.patch
slub-provide-unique-end-marker-for-each-slab-fix.patch
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bufferhead-revert-constructor-removal-checkpatch-fixes.patch
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vm-dont-run-touch_buffer-during-buffercache-lookups.patch
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cris-build-fixes-atomich-needs-compilerh-fix.patch
cris-build-fixes-update-eth_v10c-ethernet-driver-fix.patch
cris-build-fixes-fix-mtdramh-checkpatch-fixes.patch
cris-build-fixes-fixes-in-arch-cris-kernel-timec-checkpatch-fixes.patch
cris-remove-mtd_amstd-and-mtd_obsolete_chips-take-two-checkpatch-fixes.patch
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pie-executable-randomization.patch
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sound-oss-pss-set_io_base-always-returns-success-mark-it-void-checkpatch-fixes.patch
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parallel-port-convert-port_mutex-to-the-mutex-api-checkpatch-fixes.patch
remove-support-for-un-needed-_extratext-section-checkpatch-fixes.patch
allow-auto-destruction-of-loop-devices-checkpatch-fixes.patch
remove-__attribute_used__-checkpatch-fixes.patch
read_current_time-cleanups.patch
sys_times-fix-return-values.patch
sync_sb_inodes-propagate-errors.patch
64-bit-i_version-afs-fixes.patch
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r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl-fix.patch
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r-o-bind-mounts-elevate-write-count-for-some-ioctls-checkpatch-fixes.patch
r-o-bind-mounts-elevate-write-count-for-some-ioctls-vs-forbid-user-to-change-file-flags-on-quota-files.patch
r-o-bind-mounts-nfs-check-mnt-instead-of-superblock-directly-checkpatch-fixes.patch
slab-api-remove-useless-ctor-parameter-and-reorder-parameters-vs-revoke.patch
revoke-wire-up-i386-system-calls.patch
revoke-vs-git-block.patch
cgroup-simplify-space-stripping-fix.patch
memory-controller-memory-accounting-v7.patch
memory-controller-add-per-container-lru-and-reclaim-v7.patch
memory-controller-oom-handling-v7.patch
memory-controller-add-switch-to-control-what-type-of-pages-to-limit-v7.patch
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memory-cgroup-enhancements-add-status-accounting-function-for-memory-cgroup-fix-1.patch
memory-cgroup-enhancements-add-status-accounting-function-for-memory-cgroup-uninlining.patch
memory-cgroup-enhancements-add-status-accounting-function-for-memory-cgroup-fix-2.patch
memory-cgroup-enhancements-add-memorystat-file-checkpatch-fixes.patch
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introduce-flags-for-reserve_bootmem-checkpatch-fixes.patch
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d_path-make-get_dcookie-use-a-struct-path-argument-checkpatch-fixes.patch
use-struct-path-in-struct-svc_export-checkpatch-fixes.patch
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reiser4.patch
jens-broke-reiser4patch-added-to-mm-tree.patch
page-owner-tracking-leak-detector.patch
nr_blockdev_pages-in_interrupt-warning.patch
slab-leaks3-default-y.patch
profile-likely-unlikely-macros-fix.patch
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getblk-handle-2tb-devices.patch
w1-build-fix.patch
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