779b095234
* aosp/android-4.19-stable: Revert "USB: HCD: Fix URB giveback issue in tasklet function" drm/msm/mdp5: Fix global state lock backoff drm: bridge: sii8620: fix possible off-by-one drm/mediatek: dpi: Remove output format of YUV drm/rockchip: vop: Don't crash for invalid duplicate_state() drm/vc4: dsi: Correct DSI divider calculations media: hdpvr: fix error value returns in hdpvr_read drm: bridge: adv7511: Add check for mipi_dsi_driver_register wifi: iwlegacy: 4965: fix potential off-by-one overflow in il4965_rs_fill_link_cmd() ath9k: fix use-after-free in ath9k_hif_usb_rx_cb media: tw686x: Register the irq at the end of probe i2c: Fix a potential use after free drm/mediatek: Add pull-down MIPI operation in mtk_dsi_poweroff function drm/radeon: fix potential buffer overflow in ni_set_mc_special_registers() wifi: rtlwifi: fix error codes in rtl_debugfs_set_write_h2c() ath10k: do not enforce interrupt trigger type dm: return early from dm_pr_call() if DM device is suspended thermal/tools/tmon: Include pthread and time headers in tmon.h nohz/full, sched/rt: Fix missed tick-reenabling bug in dequeue_task_rt() regulator: of: Fix refcount leak bug in of_get_regulation_constraints() arm64: dts: qcom: msm8916: Fix typo in pronto remoteproc node bus: hisi_lpc: fix missing platform_device_put() in hisi_lpc_acpi_probe() ARM: dts: qcom: pm8841: add required thermal-sensor-cells cpufreq: zynq: Fix refcount leak in zynq_get_revision ARM: OMAP2+: Fix refcount leak in omap3xxx_prm_late_init soc: fsl: guts: machine variable might be unset ARM: dts: ast2500-evb: fix board compatible x86/pmem: Fix platform-device leak in error path ARM: bcm: Fix refcount leak in bcm_kona_smc_init meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init ARM: findbit: fix overflowing offset selinux: Add boundary check in put_entry() PM: hibernate: defer device probing when resuming from hibernation arm64: dts: qcom: ipq8074: fix NAND node name ACPI: LPSS: Fix missing check in register_device_clock() ACPI: PM: save NVS memory for Lenovo G40-45 ACPI: EC: Remove duplicate ThinkPad X1 Carbon 6th entry from DMI quirks ARM: OMAP2+: display: Fix refcount leak bug ARM: dts: imx6ul: fix qspi node compatible ARM: dts: imx6ul: fix lcdif node compatible ARM: dts: imx6ul: change operating-points to uint32-matrix ARM: dts: imx6ul: add missing properties for sram ext2: Add more validity checks for inode counts USB: HCD: Fix URB giveback issue in tasklet function arm64: fix oops in concurrently setting insn_emulation sysctls arm64: Do not forget syscall when starting a new thread. netfilter: nf_tables: fix null deref due to zeroed list head netfilter: nf_tables: do not allow SET_ID to refer to another table MIPS: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK powerpc/powernv: Avoid crashing if rng is NULL powerpc/fsl-pci: Fix Class Code of PCIe Root Port PCI: Add defines for normal and subtractive PCI bridges ia64, processor: fix -Wincompatible-pointer-types in ia64_get_irr() md-raid10: fix KASAN warning serial: mvebu-uart: uart2 error bits clearing fuse: limit nsec iio: light: isl29028: Fix the warning in isl29028_remove() bpf: Verifer, adjust_scalar_min_max_vals to always call update_reg_bounds() drm/amdgpu: Check BO's requested pinning domains against its preferred_domains drm/nouveau: fix another off-by-one in nvbios_addr parisc: Fix device names in /proc/iomem ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh() usbnet: Fix linkwatch use-after-free on disconnect fbcon: Fix boundary checks for fbcon=vc:n1-n2 parameters thermal: sysfs: Fix cooling_device_stats_setup() error code path fs: Add missing umask strip in vfs_tmpfile vfs: Check the truncate maximum size in inode_newsize_ok() tty: vt: initialize unicode screen buffer ALSA: hda/cirrus - support for iMac 12,1 model ALSA: hda/conexant: Add quirk for LENOVO 20149 Notebook model KVM: x86: Set error code to segment selector on LLDT/LTR non-canonical #GP KVM: x86: Mark TSS busy during LTR emulation _after_ all fault checks KVM: SVM: Don't BUG if userspace injects an interrupt with GIF=0 HID: wacom: Don't register pad_input for touch switch add barriers to buffer_uptodate and set_buffer_uptodate wifi: mac80211_hwsim: use 32-bit skb cookie wifi: mac80211_hwsim: add back erroneously removed cast wifi: mac80211_hwsim: fix race condition in pending packet ALSA: bcd2000: Fix a UAF bug on the error path of probing x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments Makefile: link with -z noexecstack --no-warn-rwx-segments Change-Id: Ibfdbdf88770193213d228f96ea0fd937b1eb8409 Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
357 lines
10 KiB
C
357 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/attr.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* changes by Thomas Schoebel-Theuer
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*/
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#include <linux/export.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/sched/signal.h>
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#include <linux/capability.h>
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#include <linux/fsnotify.h>
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#include <linux/fcntl.h>
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#include <linux/security.h>
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#include <linux/evm.h>
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#include <linux/ima.h>
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static bool chown_ok(const struct inode *inode, kuid_t uid)
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{
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if (uid_eq(current_fsuid(), inode->i_uid) &&
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uid_eq(uid, inode->i_uid))
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return true;
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if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
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return true;
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if (uid_eq(inode->i_uid, INVALID_UID) &&
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ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
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return true;
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return false;
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}
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static bool chgrp_ok(const struct inode *inode, kgid_t gid)
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{
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if (uid_eq(current_fsuid(), inode->i_uid) &&
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(in_group_p(gid) || gid_eq(gid, inode->i_gid)))
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return true;
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if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
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return true;
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if (gid_eq(inode->i_gid, INVALID_GID) &&
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ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
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return true;
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return false;
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}
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/**
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* setattr_prepare - check if attribute changes to a dentry are allowed
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* @dentry: dentry to check
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* @attr: attributes to change
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*
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* Check if we are allowed to change the attributes contained in @attr
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* in the given dentry. This includes the normal unix access permission
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* checks, as well as checks for rlimits and others. The function also clears
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* SGID bit from mode if user is not allowed to set it. Also file capabilities
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* and IMA extended attributes are cleared if ATTR_KILL_PRIV is set.
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*
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* Should be called as the first thing in ->setattr implementations,
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* possibly after taking additional locks.
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*/
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int setattr_prepare(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = d_inode(dentry);
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unsigned int ia_valid = attr->ia_valid;
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/*
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* First check size constraints. These can't be overriden using
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* ATTR_FORCE.
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*/
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if (ia_valid & ATTR_SIZE) {
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int error = inode_newsize_ok(inode, attr->ia_size);
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if (error)
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return error;
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}
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/* If force is set do it anyway. */
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if (ia_valid & ATTR_FORCE)
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goto kill_priv;
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/* Make sure a caller can chown. */
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if ((ia_valid & ATTR_UID) && !chown_ok(inode, attr->ia_uid))
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return -EPERM;
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/* Make sure caller can chgrp. */
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if ((ia_valid & ATTR_GID) && !chgrp_ok(inode, attr->ia_gid))
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return -EPERM;
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/* Make sure a caller can chmod. */
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if (ia_valid & ATTR_MODE) {
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if (!inode_owner_or_capable(inode))
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return -EPERM;
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/* Also check the setgid bit! */
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if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
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inode->i_gid) &&
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!capable_wrt_inode_uidgid(inode, CAP_FSETID))
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attr->ia_mode &= ~S_ISGID;
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}
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/* Check for setting the inode time. */
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if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
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if (!inode_owner_or_capable(inode))
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return -EPERM;
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}
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kill_priv:
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/* User has permission for the change */
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if (ia_valid & ATTR_KILL_PRIV) {
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int error;
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error = security_inode_killpriv(dentry);
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if (error)
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return error;
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}
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return 0;
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}
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EXPORT_SYMBOL(setattr_prepare);
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/**
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* inode_newsize_ok - may this inode be truncated to a given size
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* @inode: the inode to be truncated
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* @offset: the new size to assign to the inode
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*
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* inode_newsize_ok must be called with i_mutex held.
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*
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* inode_newsize_ok will check filesystem limits and ulimits to check that the
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* new inode size is within limits. inode_newsize_ok will also send SIGXFSZ
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* when necessary. Caller must not proceed with inode size change if failure is
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* returned. @inode must be a file (not directory), with appropriate
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* permissions to allow truncate (inode_newsize_ok does NOT check these
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* conditions).
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*
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* Return: 0 on success, -ve errno on failure
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*/
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int inode_newsize_ok(const struct inode *inode, loff_t offset)
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{
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if (offset < 0)
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return -EINVAL;
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if (inode->i_size < offset) {
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unsigned long limit;
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limit = rlimit(RLIMIT_FSIZE);
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if (limit != RLIM_INFINITY && offset > limit)
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goto out_sig;
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if (offset > inode->i_sb->s_maxbytes)
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goto out_big;
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} else {
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/*
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* truncation of in-use swapfiles is disallowed - it would
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* cause subsequent swapout to scribble on the now-freed
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* blocks.
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*/
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if (IS_SWAPFILE(inode))
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return -ETXTBSY;
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}
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return 0;
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out_sig:
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send_sig(SIGXFSZ, current, 0);
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out_big:
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return -EFBIG;
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}
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EXPORT_SYMBOL(inode_newsize_ok);
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/**
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* setattr_copy - copy simple metadata updates into the generic inode
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* @inode: the inode to be updated
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* @attr: the new attributes
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*
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* setattr_copy must be called with i_mutex held.
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*
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* setattr_copy updates the inode's metadata with that specified
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* in attr. Noticeably missing is inode size update, which is more complex
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* as it requires pagecache updates.
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*
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* The inode is not marked as dirty after this operation. The rationale is
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* that for "simple" filesystems, the struct inode is the inode storage.
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* The caller is free to mark the inode dirty afterwards if needed.
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*/
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void setattr_copy(struct inode *inode, const struct iattr *attr)
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{
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unsigned int ia_valid = attr->ia_valid;
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if (ia_valid & ATTR_UID)
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inode->i_uid = attr->ia_uid;
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if (ia_valid & ATTR_GID)
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inode->i_gid = attr->ia_gid;
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if (ia_valid & ATTR_ATIME)
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inode->i_atime = timespec64_trunc(attr->ia_atime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MTIME)
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inode->i_mtime = timespec64_trunc(attr->ia_mtime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_CTIME)
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inode->i_ctime = timespec64_trunc(attr->ia_ctime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MODE) {
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umode_t mode = attr->ia_mode;
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if (!in_group_p(inode->i_gid) &&
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!capable_wrt_inode_uidgid(inode, CAP_FSETID))
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mode &= ~S_ISGID;
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inode->i_mode = mode;
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}
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}
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EXPORT_SYMBOL(setattr_copy);
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/**
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* notify_change - modify attributes of a filesytem object
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* @dentry: object affected
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* @attr: new attributes
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* @delegated_inode: returns inode, if the inode is delegated
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*
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* The caller must hold the i_mutex on the affected object.
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*
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* If notify_change discovers a delegation in need of breaking,
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* it will return -EWOULDBLOCK and return a reference to the inode in
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* delegated_inode. The caller should then break the delegation and
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* retry. Because breaking a delegation may take a long time, the
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* caller should drop the i_mutex before doing so.
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*
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* Alternatively, a caller may pass NULL for delegated_inode. This may
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* be appropriate for callers that expect the underlying filesystem not
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* to be NFS exported. Also, passing NULL is fine for callers holding
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* the file open for write, as there can be no conflicting delegation in
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* that case.
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*/
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int notify_change2(struct vfsmount *mnt, struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
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{
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struct inode *inode = dentry->d_inode;
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umode_t mode = inode->i_mode;
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int error;
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struct timespec64 now;
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unsigned int ia_valid = attr->ia_valid;
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WARN_ON_ONCE(!inode_is_locked(inode));
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if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
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if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
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return -EPERM;
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}
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/*
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* If utimes(2) and friends are called with times == NULL (or both
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* times are UTIME_NOW), then we need to check for write permission
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*/
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if (ia_valid & ATTR_TOUCH) {
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if (IS_IMMUTABLE(inode))
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return -EPERM;
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if (!inode_owner_or_capable(inode)) {
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error = inode_permission2(mnt, inode, MAY_WRITE);
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if (error)
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return error;
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}
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}
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if ((ia_valid & ATTR_MODE)) {
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umode_t amode = attr->ia_mode;
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/* Flag setting protected by i_mutex */
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if (is_sxid(amode))
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inode->i_flags &= ~S_NOSEC;
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}
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now = current_time(inode);
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attr->ia_ctime = now;
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if (!(ia_valid & ATTR_ATIME_SET))
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attr->ia_atime = now;
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if (!(ia_valid & ATTR_MTIME_SET))
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attr->ia_mtime = now;
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if (ia_valid & ATTR_KILL_PRIV) {
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error = security_inode_need_killpriv(dentry);
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if (error < 0)
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return error;
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if (error == 0)
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ia_valid = attr->ia_valid &= ~ATTR_KILL_PRIV;
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}
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/*
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* We now pass ATTR_KILL_S*ID to the lower level setattr function so
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* that the function has the ability to reinterpret a mode change
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* that's due to these bits. This adds an implicit restriction that
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* no function will ever call notify_change with both ATTR_MODE and
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* ATTR_KILL_S*ID set.
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*/
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if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) &&
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(ia_valid & ATTR_MODE))
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BUG();
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if (ia_valid & ATTR_KILL_SUID) {
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if (mode & S_ISUID) {
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ia_valid = attr->ia_valid |= ATTR_MODE;
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attr->ia_mode = (inode->i_mode & ~S_ISUID);
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}
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}
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if (ia_valid & ATTR_KILL_SGID) {
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if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
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if (!(ia_valid & ATTR_MODE)) {
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ia_valid = attr->ia_valid |= ATTR_MODE;
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attr->ia_mode = inode->i_mode;
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}
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attr->ia_mode &= ~S_ISGID;
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}
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}
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if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
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return 0;
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/*
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* Verify that uid/gid changes are valid in the target
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* namespace of the superblock.
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*/
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if (ia_valid & ATTR_UID &&
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!kuid_has_mapping(inode->i_sb->s_user_ns, attr->ia_uid))
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return -EOVERFLOW;
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if (ia_valid & ATTR_GID &&
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!kgid_has_mapping(inode->i_sb->s_user_ns, attr->ia_gid))
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return -EOVERFLOW;
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/* Don't allow modifications of files with invalid uids or
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* gids unless those uids & gids are being made valid.
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*/
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if (!(ia_valid & ATTR_UID) && !uid_valid(inode->i_uid))
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return -EOVERFLOW;
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if (!(ia_valid & ATTR_GID) && !gid_valid(inode->i_gid))
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return -EOVERFLOW;
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error = security_inode_setattr(dentry, attr);
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if (error)
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return error;
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error = try_break_deleg(inode, delegated_inode);
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if (error)
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return error;
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if (mnt && inode->i_op->setattr2)
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error = inode->i_op->setattr2(mnt, dentry, attr);
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else if (inode->i_op->setattr)
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error = inode->i_op->setattr(dentry, attr);
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else
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error = simple_setattr(dentry, attr);
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if (!error) {
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fsnotify_change(dentry, ia_valid);
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ima_inode_post_setattr(dentry);
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evm_inode_post_setattr(dentry, ia_valid);
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}
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return error;
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}
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EXPORT_SYMBOL_GPL(notify_change2);
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int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
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{
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return notify_change2(NULL, dentry, attr, delegated_inode);
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}
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EXPORT_SYMBOL(notify_change);
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