--- /dev/null
+From 3433adc8bd09fc9f29b8baddf33b4ecd1ecd2cdc Mon Sep 17 00:00:00 2001
+From: Vineet Gupta <vgupta@synopsys.com>
+Date: Fri, 23 Apr 2021 12:16:25 -0700
+Subject: ARC: entry: fix off-by-one error in syscall number validation
+
+From: Vineet Gupta <vgupta@synopsys.com>
+
+commit 3433adc8bd09fc9f29b8baddf33b4ecd1ecd2cdc upstream.
+
+We have NR_syscall syscalls from [0 .. NR_syscall-1].
+However the check for invalid syscall number is "> NR_syscall" as
+opposed to >=. This off-by-one error erronesously allows "NR_syscall"
+to be treated as valid syscall causeing out-of-bounds access into
+syscall-call table ensuing a crash (holes within syscall table have a
+invalid-entry handler but this is beyond the array implementing the
+table).
+
+This problem showed up on v5.6 kernel when testing glibc 2.33 (v5.10
+kernel capable, includng faccessat2 syscall 439). The v5.6 kernel has
+NR_syscalls=439 (0 to 438). Due to the bug, 439 passed by glibc was
+not handled as -ENOSYS but processed leading to a crash.
+
+Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/48
+Reported-by: Shahab Vahedi <shahab@synopsys.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/arc/kernel/entry.S | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/arch/arc/kernel/entry.S
++++ b/arch/arc/kernel/entry.S
+@@ -169,7 +169,7 @@ tracesys:
+
+ ; Do the Sys Call as we normally would.
+ ; Validate the Sys Call number
+- cmp r8, NR_syscalls
++ cmp r8, NR_syscalls - 1
+ mov.hi r0, -ENOSYS
+ bhi tracesys_exit
+
+@@ -252,7 +252,7 @@ ENTRY(EV_Trap)
+ ;============ Normal syscall case
+
+ ; syscall num shd not exceed the total system calls avail
+- cmp r8, NR_syscalls
++ cmp r8, NR_syscalls - 1
+ mov.hi r0, -ENOSYS
+ bhi .Lret_from_system_call
+
--- /dev/null
+From 227545b9a08c68778ddd89428f99c351fc9315ac Mon Sep 17 00:00:00 2001
+From: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Date: Fri, 30 Apr 2021 12:56:56 +0800
+Subject: drm/radeon/dpm: Disable sclk switching on Oland when two 4K 60Hz monitors are connected
+
+From: Kai-Heng Feng <kai.heng.feng@canonical.com>
+
+commit 227545b9a08c68778ddd89428f99c351fc9315ac upstream.
+
+Screen flickers rapidly when two 4K 60Hz monitors are in use. This issue
+doesn't happen when one monitor is 4K 60Hz (pixelclock 594MHz) and
+another one is 4K 30Hz (pixelclock 297MHz).
+
+The issue is gone after setting "power_dpm_force_performance_level" to
+"high". Following the indication, we found that the issue occurs when
+sclk is too low.
+
+So resolve the issue by disabling sclk switching when there are two
+monitors requires high pixelclock (> 297MHz).
+
+v2:
+ - Only apply the fix to Oland.
+Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+Cc: stable@vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/radeon/radeon.h | 1 +
+ drivers/gpu/drm/radeon/radeon_pm.c | 8 ++++++++
+ drivers/gpu/drm/radeon/si_dpm.c | 3 +++
+ 3 files changed, 12 insertions(+)
+
+--- a/drivers/gpu/drm/radeon/radeon.h
++++ b/drivers/gpu/drm/radeon/radeon.h
+@@ -1562,6 +1562,7 @@ struct radeon_dpm {
+ void *priv;
+ u32 new_active_crtcs;
+ int new_active_crtc_count;
++ int high_pixelclock_count;
+ u32 current_active_crtcs;
+ int current_active_crtc_count;
+ bool single_display;
+--- a/drivers/gpu/drm/radeon/radeon_pm.c
++++ b/drivers/gpu/drm/radeon/radeon_pm.c
+@@ -1715,6 +1715,7 @@ static void radeon_pm_compute_clocks_dpm
+ struct drm_device *ddev = rdev->ddev;
+ struct drm_crtc *crtc;
+ struct radeon_crtc *radeon_crtc;
++ struct radeon_connector *radeon_connector;
+
+ if (!rdev->pm.dpm_enabled)
+ return;
+@@ -1724,6 +1725,7 @@ static void radeon_pm_compute_clocks_dpm
+ /* update active crtc counts */
+ rdev->pm.dpm.new_active_crtcs = 0;
+ rdev->pm.dpm.new_active_crtc_count = 0;
++ rdev->pm.dpm.high_pixelclock_count = 0;
+ if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
+ list_for_each_entry(crtc,
+ &ddev->mode_config.crtc_list, head) {
+@@ -1731,6 +1733,12 @@ static void radeon_pm_compute_clocks_dpm
+ if (crtc->enabled) {
+ rdev->pm.dpm.new_active_crtcs |= (1 << radeon_crtc->crtc_id);
+ rdev->pm.dpm.new_active_crtc_count++;
++ if (!radeon_crtc->connector)
++ continue;
++
++ radeon_connector = to_radeon_connector(radeon_crtc->connector);
++ if (radeon_connector->pixelclock_for_modeset > 297000)
++ rdev->pm.dpm.high_pixelclock_count++;
+ }
+ }
+ }
+--- a/drivers/gpu/drm/radeon/si_dpm.c
++++ b/drivers/gpu/drm/radeon/si_dpm.c
+@@ -3000,6 +3000,9 @@ static void si_apply_state_adjust_rules(
+ (rdev->pdev->device == 0x6605)) {
+ max_sclk = 75000;
+ }
++
++ if (rdev->pm.dpm.high_pixelclock_count > 1)
++ disable_sclk_switching = true;
+ }
+
+ if (rps->vce_active) {
--- /dev/null
+From aec86b052df6541cc97c5fca44e5934cbea4963b Mon Sep 17 00:00:00 2001
+From: Michael Ellerman <mpe@ellerman.id.au>
+Date: Thu, 6 May 2021 14:49:59 +1000
+Subject: powerpc/64s: Fix crashes when toggling entry flush barrier
+
+From: Michael Ellerman <mpe@ellerman.id.au>
+
+commit aec86b052df6541cc97c5fca44e5934cbea4963b upstream.
+
+The entry flush mitigation can be enabled/disabled at runtime via a
+debugfs file (entry_flush), which causes the kernel to patch itself to
+enable/disable the relevant mitigations.
+
+However depending on which mitigation we're using, it may not be safe to
+do that patching while other CPUs are active. For example the following
+crash:
+
+ sleeper[15639]: segfault (11) at c000000000004c20 nip c000000000004c20 lr c000000000004c20
+
+Shows that we returned to userspace with a corrupted LR that points into
+the kernel, due to executing the partially patched call to the fallback
+entry flush (ie. we missed the LR restore).
+
+Fix it by doing the patching under stop machine. The CPUs that aren't
+doing the patching will be spinning in the core of the stop machine
+logic. That is currently sufficient for our purposes, because none of
+the patching we do is to that code or anywhere in the vicinity.
+
+Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")
+Cc: stable@vger.kernel.org # v5.10+
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+Link: https://lore.kernel.org/r/20210506044959.1298123-2-mpe@ellerman.id.au
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/powerpc/lib/feature-fixups.c | 16 +++++++++++++++-
+ 1 file changed, 15 insertions(+), 1 deletion(-)
+
+--- a/arch/powerpc/lib/feature-fixups.c
++++ b/arch/powerpc/lib/feature-fixups.c
+@@ -297,8 +297,9 @@ void do_uaccess_flush_fixups(enum l1d_fl
+ : "unknown");
+ }
+
+-void do_entry_flush_fixups(enum l1d_flush_type types)
++static int __do_entry_flush_fixups(void *data)
+ {
++ enum l1d_flush_type types = *(enum l1d_flush_type *)data;
+ unsigned int instrs[3], *dest;
+ long *start, *end;
+ int i;
+@@ -349,6 +350,19 @@ void do_entry_flush_fixups(enum l1d_flus
+ : "ori type" :
+ (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
+ : "unknown");
++
++ return 0;
++}
++
++void do_entry_flush_fixups(enum l1d_flush_type types)
++{
++ /*
++ * The call to the fallback flush can not be safely patched in/out while
++ * other CPUs are executing it. So call __do_entry_flush_fixups() on one
++ * CPU while all other CPUs spin in the stop machine core with interrupts
++ * hard disabled.
++ */
++ stop_machine(__do_entry_flush_fixups, &types, NULL);
+ }
+
+ void do_rfi_flush_fixups(enum l1d_flush_type types)
--- /dev/null
+From 8ec7791bae1327b1c279c5cd6e929c3b12daaf0a Mon Sep 17 00:00:00 2001
+From: Michael Ellerman <mpe@ellerman.id.au>
+Date: Thu, 6 May 2021 14:49:58 +1000
+Subject: powerpc/64s: Fix crashes when toggling stf barrier
+
+From: Michael Ellerman <mpe@ellerman.id.au>
+
+commit 8ec7791bae1327b1c279c5cd6e929c3b12daaf0a upstream.
+
+The STF (store-to-load forwarding) barrier mitigation can be
+enabled/disabled at runtime via a debugfs file (stf_barrier), which
+causes the kernel to patch itself to enable/disable the relevant
+mitigations.
+
+However depending on which mitigation we're using, it may not be safe to
+do that patching while other CPUs are active. For example the following
+crash:
+
+ User access of kernel address (c00000003fff5af0) - exploit attempt? (uid: 0)
+ segfault (11) at c00000003fff5af0 nip 7fff8ad12198 lr 7fff8ad121f8 code 1
+ code: 40820128 e93c00d0 e9290058 7c292840 40810058 38600000 4bfd9a81 e8410018
+ code: 2c030006 41810154 3860ffb6 e9210098 <e94d8ff0> 7d295279 39400000 40820a3c
+
+Shows that we returned to userspace without restoring the user r13
+value, due to executing the partially patched STF exit code.
+
+Fix it by doing the patching under stop machine. The CPUs that aren't
+doing the patching will be spinning in the core of the stop machine
+logic. That is currently sufficient for our purposes, because none of
+the patching we do is to that code or anywhere in the vicinity.
+
+Fixes: a048a07d7f45 ("powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit")
+Cc: stable@vger.kernel.org # v4.17+
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+Link: https://lore.kernel.org/r/20210506044959.1298123-1-mpe@ellerman.id.au
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/powerpc/lib/feature-fixups.c | 19 +++++++++++++++++--
+ 1 file changed, 17 insertions(+), 2 deletions(-)
+
+--- a/arch/powerpc/lib/feature-fixups.c
++++ b/arch/powerpc/lib/feature-fixups.c
+@@ -18,6 +18,7 @@
+ #include <linux/string.h>
+ #include <linux/init.h>
+ #include <linux/sched/mm.h>
++#include <linux/stop_machine.h>
+ #include <asm/cputable.h>
+ #include <asm/code-patching.h>
+ #include <asm/page.h>
+@@ -225,11 +226,25 @@ void do_stf_exit_barrier_fixups(enum stf
+ : "unknown");
+ }
+
++static int __do_stf_barrier_fixups(void *data)
++{
++ enum stf_barrier_type *types = data;
++
++ do_stf_entry_barrier_fixups(*types);
++ do_stf_exit_barrier_fixups(*types);
++
++ return 0;
++}
+
+ void do_stf_barrier_fixups(enum stf_barrier_type types)
+ {
+- do_stf_entry_barrier_fixups(types);
+- do_stf_exit_barrier_fixups(types);
++ /*
++ * The call to the fallback entry flush, and the fallback/sync-ori exit
++ * flush can not be safely patched in/out while other CPUs are executing
++ * them. So call __do_stf_barrier_fixups() on one CPU while all other CPUs
++ * spin in the stop machine core with interrupts hard disabled.
++ */
++ stop_machine(__do_stf_barrier_fixups, &types, NULL);
+ }
+
+ void do_uaccess_flush_fixups(enum l1d_flush_type types)
net-fix-nla_strcmp-to-handle-more-then-one-trailing-.patch
kernel-kexec_file-fix-error-return-code-of-kexec_cal.patch
netfilter-nftables-avoid-overflows-in-nft_hash_bucke.patch
+arc-entry-fix-off-by-one-error-in-syscall-number-validation.patch
+powerpc-64s-fix-crashes-when-toggling-stf-barrier.patch
+powerpc-64s-fix-crashes-when-toggling-entry-flush-barrier.patch
+squashfs-fix-divide-error-in-calculate_skip.patch
+userfaultfd-release-page-in-error-path-to-avoid-bug_on.patch
+drm-radeon-dpm-disable-sclk-switching-on-oland-when-two-4k-60hz-monitors-are-connected.patch
--- /dev/null
+From d6e621de1fceb3b098ebf435ef7ea91ec4838a1a Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@squashfs.org.uk>
+Date: Fri, 14 May 2021 17:27:16 -0700
+Subject: squashfs: fix divide error in calculate_skip()
+
+From: Phillip Lougher <phillip@squashfs.org.uk>
+
+commit d6e621de1fceb3b098ebf435ef7ea91ec4838a1a upstream.
+
+Sysbot has reported a "divide error" which has been identified as being
+caused by a corrupted file_size value within the file inode. This value
+has been corrupted to a much larger value than expected.
+
+Calculate_skip() is passed i_size_read(inode) >> msblk->block_log. Due to
+the file_size value corruption this overflows the int argument/variable in
+that function, leading to the divide error.
+
+This patch changes the function to use u64. This will accommodate any
+unexpectedly large values due to corruption.
+
+The value returned from calculate_skip() is clamped to be never more than
+SQUASHFS_CACHED_BLKS - 1, or 7. So file_size corruption does not lead to
+an unexpectedly large return result here.
+
+Link: https://lkml.kernel.org/r/20210507152618.9447-1-phillip@squashfs.org.uk
+Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
+Reported-by: <syzbot+e8f781243ce16ac2f962@syzkaller.appspotmail.com>
+Reported-by: <syzbot+7b98870d4fec9447b951@syzkaller.appspotmail.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/squashfs/file.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+--- a/fs/squashfs/file.c
++++ b/fs/squashfs/file.c
+@@ -224,11 +224,11 @@ failure:
+ * If the skip factor is limited in this way then the file will use multiple
+ * slots.
+ */
+-static inline int calculate_skip(int blocks)
++static inline int calculate_skip(u64 blocks)
+ {
+- int skip = blocks / ((SQUASHFS_META_ENTRIES + 1)
++ u64 skip = blocks / ((SQUASHFS_META_ENTRIES + 1)
+ * SQUASHFS_META_INDEXES);
+- return min(SQUASHFS_CACHED_BLKS - 1, skip + 1);
++ return min((u64) SQUASHFS_CACHED_BLKS - 1, skip + 1);
+ }
+
+
--- /dev/null
+From 7ed9d238c7dbb1fdb63ad96a6184985151b0171c Mon Sep 17 00:00:00 2001
+From: Axel Rasmussen <axelrasmussen@google.com>
+Date: Fri, 14 May 2021 17:27:19 -0700
+Subject: userfaultfd: release page in error path to avoid BUG_ON
+
+From: Axel Rasmussen <axelrasmussen@google.com>
+
+commit 7ed9d238c7dbb1fdb63ad96a6184985151b0171c upstream.
+
+Consider the following sequence of events:
+
+1. Userspace issues a UFFD ioctl, which ends up calling into
+ shmem_mfill_atomic_pte(). We successfully account the blocks, we
+ shmem_alloc_page(), but then the copy_from_user() fails. We return
+ -ENOENT. We don't release the page we allocated.
+2. Our caller detects this error code, tries the copy_from_user() after
+ dropping the mmap_lock, and retries, calling back into
+ shmem_mfill_atomic_pte().
+3. Meanwhile, let's say another process filled up the tmpfs being used.
+4. So shmem_mfill_atomic_pte() fails to account blocks this time, and
+ immediately returns - without releasing the page.
+
+This triggers a BUG_ON in our caller, which asserts that the page
+should always be consumed, unless -ENOENT is returned.
+
+To fix this, detect if we have such a "dangling" page when accounting
+fails, and if so, release it before returning.
+
+Link: https://lkml.kernel.org/r/20210428230858.348400-1-axelrasmussen@google.com
+Fixes: cb658a453b93 ("userfaultfd: shmem: avoid leaking blocks and used blocks in UFFDIO_COPY")
+Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
+Reported-by: Hugh Dickins <hughd@google.com>
+Acked-by: Hugh Dickins <hughd@google.com>
+Reviewed-by: Peter Xu <peterx@redhat.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ mm/shmem.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+--- a/mm/shmem.c
++++ b/mm/shmem.c
+@@ -2251,8 +2251,18 @@ static int shmem_mfill_atomic_pte(struct
+ pgoff_t offset, max_off;
+
+ ret = -ENOMEM;
+- if (!shmem_inode_acct_block(inode, 1))
++ if (!shmem_inode_acct_block(inode, 1)) {
++ /*
++ * We may have got a page, returned -ENOENT triggering a retry,
++ * and now we find ourselves with -ENOMEM. Release the page, to
++ * avoid a BUG_ON in our caller.
++ */
++ if (unlikely(*pagep)) {
++ put_page(*pagep);
++ *pagep = NULL;
++ }
+ goto out;
++ }
+
+ if (!*pagep) {
+ page = shmem_alloc_page(gfp, info, pgoff);
projects / thirdparty / kernel / stable-queue.git / commitdiff
