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[PATCH 001/195] Revert "drm/sun4i: dsi: Change the start delay calculation"
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Icenowy Zheng <icenowy(a)aosc.io> [ Upstream commit a00d17e0a71ae2e4fdaac46e1c12785d3346c3f2 ] This reverts commit da676c6aa6413d59ab0a80c97bbc273025e640b2. The original commit adds a start parameter to the calculation of the start delay according to some old BSP versions from Allwinner. However, there're two ways to add this delay -- add it in DSI controller or add it in the TCON. Add it in both controllers won't work. The code before this commit is picked from new versions of BSP kernel, which has a comment for the 1 that says "put start_delay to tcon". By checking the sun4i_tcon0_mode_set_cpu() in sun4i_tcon driver, it has already added this delay, so we shouldn't repeat to add the delay in DSI controller, otherwise the timing won't match. Signed-off-by: Icenowy Zheng <icenowy(a)aosc.io> Reviewed-by: Jagan Teki <jagan(a)amarulasolutions.com> Signed-off-by: Maxime Ripard <mripard(a)kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20191001080253.6135-2-icenowy… Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 97a0573..79eb11c 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -357,8 +357,7 @@ static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi, static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi, struct drm_display_mode *mode) { - u16 start = clamp(mode->vtotal - mode->vdisplay - 10, 8, 100); - u16 delay = mode->vtotal - (mode->vsync_end - mode->vdisplay) + start; + u16 delay = mode->vtotal - (mode->vsync_end - mode->vdisplay) + 1; if (delay > mode->vtotal) delay = delay % mode->vtotal; -- 1.8.3

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[PATCH 01/72] vfs: fix do_last() regression
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Al Viro <viro(a)zeniv.linux.org.uk> commit 6404674acd596de41fd3ad5f267b4525494a891a upstream. Brown paperbag time: fetching ->i_uid/->i_mode really should've been done from nd->inode. I even suggested that, but the reason for that has slipped through the cracks and I went for dir->d_inode instead - made for more "obvious" patch. Analysis: - at the entry into do_last() and all the way to step_into(): dir (aka nd->path.dentry) is known not to have been freed; so's nd->inode and it's equal to dir->d_inode unless we are already doomed to -ECHILD. inode of the file to get opened is not known. - after step_into(): inode of the file to get opened is known; dir might be pointing to freed memory/be negative/etc. - at the call of may_create_in_sticky(): guaranteed to be out of RCU mode; inode of the file to get opened is known and pinned; dir might be garbage. The last was the reason for the original patch. Except that at the do_last() entry we can be in RCU mode and it is possible that nd->path.dentry->d_inode has already changed under us. In that case we are going to fail with -ECHILD, but we need to be careful; nd->inode is pointing to valid struct inode and it's the same as nd->path.dentry->d_inode in "won't fail with -ECHILD" case, so we should use that. Reported-by: "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala(a)nokia.com> Reported-by: syzbot+190005201ced78a74ad6(a)syzkaller.appspotmail.com Wearing-brown-paperbag: Al Viro <viro(a)zeniv.linux.org.uk> Cc: stable(a)kernel.org Fixes: d0cb50185ae9 ("do_last(): fetch directory ->i_mode and ->i_uid before it's too late") Signed-off-by: Al Viro <viro(a)zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- fs/namei.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 1dd68b3..18ddae1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3266,8 +3266,8 @@ static int do_last(struct nameidata *nd, struct file *file, const struct open_flags *op) { struct dentry *dir = nd->path.dentry; - kuid_t dir_uid = dir->d_inode->i_uid; - umode_t dir_mode = dir->d_inode->i_mode; + kuid_t dir_uid = nd->inode->i_uid; + umode_t dir_mode = nd->inode->i_mode; int open_flag = op->open_flag; bool will_truncate = (open_flag & O_TRUNC) != 0; bool got_write = false; -- 1.8.3

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[PATCH 001/137] can, slip: Protect tty->disc_data in write_wakeup and close with RCU
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Richard Palethorpe <rpalethorpe(a)suse.com> [ Upstream commit 0ace17d56824165c7f4c68785d6b58971db954dd ] write_wakeup can happen in parallel with close/hangup where tty->disc_data is set to NULL and the netdevice is freed thus also freeing disc_data. write_wakeup accesses disc_data so we must prevent close from freeing the netdev while write_wakeup has a non-NULL view of tty->disc_data. We also need to make sure that accesses to disc_data are atomic. Which can all be done with RCU. This problem was found by Syzkaller on SLCAN, but the same issue is reproducible with the SLIP line discipline using an LTP test based on the Syzkaller reproducer. A fix which didn't use RCU was posted by Hillf Danton. Fixes: 661f7fda21b1 ("slip: Fix deadlock in write_wakeup") Fixes: a8e83b17536a ("slcan: Port write_wakeup deadlock fix from slip") Reported-by: syzbot+017e491ae13c0068598a(a)syzkaller.appspotmail.com Signed-off-by: Richard Palethorpe <rpalethorpe(a)suse.com> Cc: Wolfgang Grandegger <wg(a)grandegger.com> Cc: Marc Kleine-Budde <mkl(a)pengutronix.de> Cc: "David S. Miller" <davem(a)davemloft.net> Cc: Tyler Hall <tylerwhall(a)gmail.com> Cc: linux-can(a)vger.kernel.org Cc: netdev(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: syzkaller(a)googlegroups.com Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/net/can/slcan.c | 12 ++++++++++-- drivers/net/slip/slip.c | 12 ++++++++++-- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c index cf0769a..b2e5bca 100644 --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -343,9 +343,16 @@ static void slcan_transmit(struct work_struct *work) */ static void slcan_write_wakeup(struct tty_struct *tty) { - struct slcan *sl = tty->disc_data; + struct slcan *sl; + + rcu_read_lock(); + sl = rcu_dereference(tty->disc_data); + if (!sl) + goto out; schedule_work(&sl->tx_work); +out: + rcu_read_unlock(); } /* Send a can_frame to a TTY queue. */ @@ -640,10 +647,11 @@ static void slcan_close(struct tty_struct *tty) return; spin_lock_bh(&sl->lock); - tty->disc_data = NULL; + rcu_assign_pointer(tty->disc_data, NULL); sl->tty = NULL; spin_unlock_bh(&sl->lock); + synchronize_rcu(); flush_work(&sl->tx_work); /* Flush network side */ diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c index 77207f9..93f303e 100644 --- a/drivers/net/slip/slip.c +++ b/drivers/net/slip/slip.c @@ -452,9 +452,16 @@ static void slip_transmit(struct work_struct *work) */ static void slip_write_wakeup(struct tty_struct *tty) { - struct slip *sl = tty->disc_data; + struct slip *sl; + + rcu_read_lock(); + sl = rcu_dereference(tty->disc_data); + if (!sl) + goto out; schedule_work(&sl->tx_work); +out: + rcu_read_unlock(); } static void sl_tx_timeout(struct net_device *dev) @@ -882,10 +889,11 @@ static void slip_close(struct tty_struct *tty) return; spin_lock_bh(&sl->lock); - tty->disc_data = NULL; + rcu_assign_pointer(tty->disc_data, NULL); sl->tty = NULL; spin_unlock_bh(&sl->lock); + synchronize_rcu(); flush_work(&sl->tx_work); /* VSV = very important to remove timers */ -- 1.8.3

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[PATCH 1/3] mm/memory_hotplug: simplify and fix check_hotplug_memory_range()
by Yang Yingliang 16 Apr '20

16 Apr '20

From: David Hildenbrand <david(a)redhat.com> mainline inclusion from mainline-5.3-rc1 commit cec3ebd083d4e8d161d0b18894c78e3311bcd026 category: bugfix bugzilla: 29418 CVE: NA ------------------------------------------------- Patch series "mm/memory_hotplug: Factor out memory block devicehandling", v3. We only want memory block devices for memory to be onlined/offlined (add/remove from the buddy). This is required so user space can online/offline memory and kdump gets notified about newly onlined memory. Let's factor out creation/removal of memory block devices. This helps to further cleanup arch_add_memory/arch_remove_memory() and to make implementation of new features easier - especially sub-section memory hot add from Dan. Anshuman Khandual is currently working on arch_remove_memory(). I added a temporary solution via "arm64/mm: Add temporary arch_remove_memory() implementation", that is sufficient as a firsts tep in the context of this series. (we don't cleanup page tables in case anything goes wrong already) Did a quick sanity test with DIMM plug/unplug, making sure all devices and sysfs links properly get added/removed. Compile tested on s390x and x86-64. This patch (of 11): By converting start and size to page granularity, we actually ignore unaligned parts within a page instead of properly bailing out with an error. Link: http://lkml.kernel.org/r/20190527111152.16324-2-david@redhat.com Signed-off-by: David Hildenbrand <david(a)redhat.com> Reviewed-by: Dan Williams <dan.j.williams(a)intel.com> Reviewed-by: Wei Yang <richardw.yang(a)linux.intel.com> Reviewed-by: Pavel Tatashin <pasha.tatashin(a)soleen.com> Reviewed-by: Oscar Salvador <osalvador(a)suse.de> Acked-by: Michal Hocko <mhocko(a)suse.com> Cc: David Hildenbrand <david(a)redhat.com> Cc: Qian Cai <cai(a)lca.pw> Cc: Arun KS <arunks(a)codeaurora.org> Cc: Mathieu Malaterre <malat(a)debian.org> Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: Andrew Banman <andrew.banman(a)hpe.com> Cc: Andy Lutomirski <luto(a)kernel.org> Cc: Anshuman Khandual <anshuman.khandual(a)arm.com> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Cc: Baoquan He <bhe(a)redhat.com> Cc: Benjamin Herrenschmidt <benh(a)kernel.crashing.org> Cc: Borislav Petkov <bp(a)alien8.de> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Chintan Pandya <cpandya(a)codeaurora.org> Cc: Christophe Leroy <christophe.leroy(a)c-s.fr> Cc: Chris Wilson <chris(a)chris-wilson.co.uk> Cc: Dave Hansen <dave.hansen(a)linux.intel.com> Cc: "David S. Miller" <davem(a)davemloft.net> Cc: Fenghua Yu <fenghua.yu(a)intel.com> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: Heiko Carstens <heiko.carstens(a)de.ibm.com> Cc: "H. Peter Anvin" <hpa(a)zytor.com> Cc: Ingo Molnar <mingo(a)kernel.org> Cc: Jonathan Cameron <Jonathan.Cameron(a)huawei.com> Cc: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Cc: Jun Yao <yaojun8558363(a)gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov(a)linux.intel.com> Cc: Logan Gunthorpe <logang(a)deltatee.com> Cc: Mark Brown <broonie(a)kernel.org> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Masahiro Yamada <yamada.masahiro(a)socionext.com> Cc: Michael Ellerman <mpe(a)ellerman.id.au> Cc: Mike Rapoport <rppt(a)linux.vnet.ibm.com> Cc: "mike.travis(a)hpe.com" <mike.travis(a)hpe.com> Cc: Nicholas Piggin <npiggin(a)gmail.com> Cc: Paul Mackerras <paulus(a)samba.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: "Rafael J. Wysocki" <rafael(a)kernel.org> Cc: Rich Felker <dalias(a)libc.org> Cc: Rob Herring <robh(a)kernel.org> Cc: Robin Murphy <robin.murphy(a)arm.com> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Tony Luck <tony.luck(a)intel.com> Cc: Vasily Gorbik <gor(a)linux.ibm.com> Cc: Will Deacon <will.deacon(a)arm.com> Cc: Yoshinori Sato <ysato(a)users.sourceforge.jp> Cc: Yu Zhao <yuzhao(a)google.com> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Kefeng Wang <wangkefeng.wang(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- mm/memory_hotplug.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8a6ad9b..bfd148d 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1059,16 +1059,11 @@ int try_online_node(int nid) static int check_hotplug_memory_range(u64 start, u64 size) { - unsigned long block_sz = memory_block_size_bytes(); - u64 block_nr_pages = block_sz >> PAGE_SHIFT; - u64 nr_pages = size >> PAGE_SHIFT; - u64 start_pfn = PFN_DOWN(start); - /* memory range must be block size aligned */ - if (!nr_pages || !IS_ALIGNED(start_pfn, block_nr_pages) || - !IS_ALIGNED(nr_pages, block_nr_pages)) { + if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || + !IS_ALIGNED(size, memory_block_size_bytes())) { pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", - block_sz, start, size); + memory_block_size_bytes(), start, size); return -EINVAL; } -- 1.8.3

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Re: perf spe-c2c record 失败的问题
by Xie XiuQi 16 Apr '20

16 Apr '20

Hi， On 2020/4/16 15:14, haoxin wrote: > 您好，我采用最细的openEuler-1.0测试perf spe-c2c的功能，但是发现/sys/devices下没有arm_spe_0这个目录 > 执行perf spe-c2c record时显示： > event syntax error: 'arm_spe_0/ts_enable=1,pct_enable=1,pa_enable=1,load_filter=1,jitter=1,store_filter=1,min_latency=0/' > \___ Cannot find PMU `arm_spe_0'. Missing kernel support? > > 想问下您这是为什么？需要哪里开启spe功能吗？ > > 确认一下启动参数需要加 kpti=off 还有 BIOS 需要支持 PPTT 2.0 > >

1 0

[PATCH 001/552] Revert "efi: Fix debugobjects warning on 'efi_rts_work'"
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> This reverts commit 3e6b472f474accf757e107919f8ee42e7315ac0d which is commit ef1491e791308317bb9851a0ad380c4a68b58d54 upstream. Chris reports that this commit has problems and should not have been backported to 4.19.y Reported-by: Chris Wilson <chris(a)chris-wilson.co.uk> Cc: Waiman Long <longman(a)redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya(a)intel.com> Cc: Linus Torvalds <torvalds(a)linux-foundation.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: linux-efi(a)vger.kernel.org Cc: Ingo Molnar <mingo(a)kernel.org> Cc: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/firmware/efi/runtime-wrappers.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index a779342..b9014c8 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -95,7 +95,7 @@ struct efi_runtime_work { efi_rts_work.status = EFI_ABORTED; \ \ init_completion(&efi_rts_work.efi_rts_comp); \ - INIT_WORK(&efi_rts_work.work, efi_call_rts); \ + INIT_WORK_ONSTACK(&efi_rts_work.work, efi_call_rts); \ efi_rts_work.arg1 = _arg1; \ efi_rts_work.arg2 = _arg2; \ efi_rts_work.arg3 = _arg3; \ -- 1.8.3

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[PATCH 001/104] ARM: dts: meson8: fix the size of the PMU registers
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Martin Blumenstingl <martin.blumenstingl(a)googlemail.com> commit 46c9585ed4af688ff1be6d4e76d7ed2f04de4fba upstream. The PMU registers are at least 0x18 bytes wide. Meson8b already uses a size of 0x18. The structure of the PMU registers on Meson8 and Meson8b is similar but not identical. Meson8 and Meson8b have the following registers in common (starting at AOBUS + 0xe0): #define AO_RTI_PWR_A9_CNTL0 0xe0 (0x38 << 2) #define AO_RTI_PWR_A9_CNTL1 0xe4 (0x39 << 2) #define AO_RTI_GEN_PWR_SLEEP0 0xe8 (0x3a << 2) #define AO_RTI_GEN_PWR_ISO0 0x4c (0x3b << 2) Meson8b additionally has these three registers: #define AO_RTI_GEN_PWR_ACK0 0xf0 (0x3c << 2) #define AO_RTI_PWR_A9_MEM_PD0 0xf4 (0x3d << 2) #define AO_RTI_PWR_A9_MEM_PD1 0xf8 (0x3e << 2) Thus we can assume that the register size of the PMU IP blocks is identical on both SoCs (and Meson8 just contains some reserved registers in that area) because the CEC registers start right after the PMU (AO_RTI_*) registers at AOBUS + 0x100 (0x40 << 2). The upcoming power domain driver will need to read and write the AO_RTI_GEN_PWR_SLEEP0 and AO_RTI_GEN_PWR_ISO0 registers, so the updated size is needed for that driver to work. Fixes: 4a5a27116b447d ("ARM: dts: meson8: add support for booting the secondary CPU cores") Signed-off-by: Martin Blumenstingl <martin.blumenstingl(a)googlemail.com> Signed-off-by: Kevin Hilman <khilman(a)baylibre.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- arch/arm/boot/dts/meson8.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi index 7162e0c..ba78170e7 100644 --- a/arch/arm/boot/dts/meson8.dtsi +++ b/arch/arm/boot/dts/meson8.dtsi @@ -139,7 +139,7 @@ &aobus { pmu: pmu@e0 { compatible = "amlogic,meson8-pmu", "syscon"; - reg = <0xe0 0x8>; + reg = <0xe0 0x18>; }; pinctrl_aobus: pinctrl@84 { -- 1.8.3

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[PATCH 01/74] hidraw: Return EPOLLOUT from hidraw_poll
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Fabian Henneke <fabian.henneke(a)gmail.com> [ Upstream commit 378b80370aa1fe50f9c48a3ac8af3e416e73b89f ] Always return EPOLLOUT from hidraw_poll when a device is connected. This is safe since writes are always possible (but will always block). hidraw does not support non-blocking writes and instead always calls blocking backend functions on write requests. Hence, so far, a call to poll never returned EPOLLOUT, which confuses tools like socat. Signed-off-by: Fabian Henneke <fabian.henneke(a)gmail.com> In-reply-to: <CA+hv5qkyis03CgYTWeWX9cr0my-d2Oe+aZo+mjmWRXgjrGqyrw(a)mail.gmail.com> Signed-off-by: Jiri Kosina <jkosina(a)suse.cz> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/hid/hidraw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index c7cff92..c75b66d 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -260,7 +260,7 @@ static __poll_t hidraw_poll(struct file *file, poll_table *wait) poll_wait(file, &list->hidraw->wait, wait); if (list->head != list->tail) - return EPOLLIN | EPOLLRDNORM; + return EPOLLIN | EPOLLRDNORM | EPOLLOUT; if (!list->hidraw->exist) return EPOLLERR | EPOLLHUP; return 0; -- 1.8.3

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[PATCH] iommu/arm-smmu: Mark expected switch fall-through
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Anders Roxell <anders.roxell(a)linaro.org> mainline inclusion from mainline-v5.3-rc5 commit 11f4fe9ba3c85a4efac7ec25e75056a9b612d9da category: bugfix bugzilla: 20500 CVE: NA ------------------------------------------------------------------------- Now that -Wimplicit-fallthrough is passed to GCC by default, the following warning shows up: ../drivers/iommu/arm-smmu-v3.c: In function ‘arm_smmu_write_strtab_ent’: ../drivers/iommu/arm-smmu-v3.c:1189:7: warning: this statement may fall through [-Wimplicit-fallthrough=] if (disable_bypass) ^ ../drivers/iommu/arm-smmu-v3.c:1191:3: note: here default: ^~~~~~~ Rework so that the compiler doesn't warn about fall-through. Make it clearer by calling 'BUG_ON()' when disable_bypass is set, and always 'break;' Signed-off-by: Anders Roxell <anders.roxell(a)linaro.org> Acked-by: Will Deacon <will(a)kernel.org> Signed-off-by: Joerg Roedel <jroedel(a)suse.de> Signed-off-by: Zhen Lei <thunder.leizhen(a)huawei.com> Reviewed-by: Hanjun Guo <guohanjun(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/iommu/arm-smmu-v3.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index e8f7bd3..5ee08ab 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1226,8 +1226,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid, ste_live = true; break; case STRTAB_STE_0_CFG_ABORT: - if (disable_bypass) - break; + BUG_ON(!disable_bypass); + break; default: BUG(); /* STE corruption */ } -- 1.8.3

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[PATCH] efi/memreserve: Register reservations as 'reserved' in /proc/iomem
by Yang Yingliang 16 Apr '20

16 Apr '20

From: Ard Biesheuvel <ardb(a)kernel.org> mainline inclusion from mainline-5.5-rc3 commit ab0eb16205b4 category: bugfix bugzilla: 27656 CVE: NA ------------------------------------------------- Memory regions that are reserved using efi_mem_reserve_persistent() are recorded in a special EFI config table which survives kexec, allowing the incoming kernel to honour them as well. However, such reservations are not visible in /proc/iomem, and so the kexec tools that load the incoming kernel and its initrd into memory may overwrite these reserved regions before the incoming kernel has a chance to reserve them from further use. Address this problem by adding these reservations to /proc/iomem as they are created. Note that reservations that are inherited from a previous kernel are memblock_reserve()'d early on, so they are already visible in /proc/iomem. Tested-by: Masayoshi Mizuma <m.mizuma(a)jp.fujitsu.com> Tested-by: Bhupesh Sharma <bhsharma(a)redhat.com> Signed-off-by: Ard Biesheuvel <ardb(a)kernel.org> Reviewed-by: Bhupesh Sharma <bhsharma(a)redhat.com> Cc: <stable(a)vger.kernel.org> # v5.4+ Cc: Andy Shevchenko <andriy.shevchenko(a)linux.intel.com> Cc: Arvind Sankar <nivedita(a)alum.mit.edu> Cc: linux-efi(a)vger.kernel.org Link: https://lkml.kernel.org/r/20191206165542.31469-2-ardb@kernel.org Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Hanjun Guo <guohanjun(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/firmware/efi/efi.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index e304439..f386a78 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -998,6 +998,24 @@ static int __init efi_memreserve_map_root(void) return 0; } +static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size) +{ + struct resource *res, *parent; + + res = kzalloc(sizeof(struct resource), GFP_ATOMIC); + if (!res) + return -ENOMEM; + + res->name = "reserved"; + res->flags = IORESOURCE_MEM; + res->start = addr; + res->end = addr + size - 1; + + /* we expect a conflict with a 'System RAM' region */ + parent = request_resource_conflict(&iomem_resource, res); + return parent ? request_resource(parent, res) : 0; +} + int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) { struct linux_efi_memreserve *rsv; @@ -1022,7 +1040,7 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) rsv->entry[index].size = size; memunmap(rsv); - return 0; + return efi_mem_reserve_iomem(addr, size); } memunmap(rsv); } @@ -1032,6 +1050,12 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) if (!rsv) return -ENOMEM; + rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K); + if (rc) { + free_page((unsigned long)rsv); + return rc; + } + /* * The memremap() call above assumes that a linux_efi_memreserve entry * never crosses a page boundary, so let's ensure that this remains true @@ -1048,7 +1072,7 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) efi_memreserve_root->next = __pa(rsv); spin_unlock(&efi_mem_reserve_persistent_lock); - return 0; + return efi_mem_reserve_iomem(addr, size); } static int __init efi_memreserve_root_init(void) -- 1.8.3

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