David Hildenbrand 93abf5e0d5 fs/proc/task_mmu: fix PAGE_IS_PFNZERO detection for the huge zero folio ...

commit 4a5e85f4eb upstream.

is_zero_pfn() does not work for the huge zero folio. Fix it by using
is_huge_zero_pmd().

This can cause the PAGEMAP_SCAN ioctl against /proc/pid/pagemap to
present pages as PAGE_IS_PRESENT rather than as PAGE_IS_PFNZERO.

Found by code inspection.

Link: https://lkml.kernel.org/r/20250617143532.2375383-1-david@redhat.com
Fixes: 52526ca7fd ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-07-06 11:01:39 +02:00

..

array.c

fs/proc: do_task_stat: Fix ESP not readable during coredump

2025-02-17 10:05:04 +01:00

base.c

fs/procfs: fix the comment above proc_pid_wchan()

2025-04-10 14:39:26 +02:00

bootconfig.c

…

cmdline.c

…

consoles.c

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cpuinfo.c

…

devices.c

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fd.c

proc: Fix W=1 build kernel-doc warning

2024-10-18 13:02:47 +02:00

fd.h

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generic.c

proc: fix UAF in proc_get_inode()

2025-03-28 22:03:30 +01:00

inode.c

proc: fix UAF in proc_get_inode()

2025-03-28 22:03:30 +01:00

internal.h

proc: fix UAF in proc_get_inode()

2025-03-28 22:03:30 +01:00

interrupts.c

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Kconfig

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kcore.c

fs/proc/kcore.c: Clear ret value in read_kcore_iter after successful iov_iter_zero

2024-12-09 10:41:07 +01:00

kmsg.c

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loadavg.c

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Makefile

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meminfo.c

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namespaces.c

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nommu.c

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page.c

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proc_net.c

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proc_sysctl.c

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proc_tty.c

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root.c

…

self.c

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softirqs.c

proc/softirqs: replace seq_printf with seq_put_decimal_ull_width

2024-11-07 07:40:14 -10:00

stat.c

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task_mmu.c

fs/proc/task_mmu: fix PAGE_IS_PFNZERO detection for the huge zero folio

2025-07-06 11:01:39 +02:00

task_nommu.c

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thread_self.c

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uptime.c

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util.c

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version.c

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vmcore.c

fs/proc: fix softlockup in __read_vmcore (part 2)

2025-01-23 17:23:01 +01:00