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| author | Laurentiu Tudor <laurentiu.tudor@nxp.com> | 2017-02-16 09:11:29 -0600 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-03 11:24:50 +1100 |
| commit | 3fb66a70a4ae886445743354e4b60e54058bb3ff (patch) | |
| tree | 78afb6fe012e8d1a8ef52c72c2477eb22206a063 /arch | |
| parent | 4dc831aa88132f835cefe876aa0206977c4d7710 (diff) | |
| download | linux-3fb66a70a4ae886445743354e4b60e54058bb3ff.tar.bz2 | |
powerpc/booke: Fix boot crash due to null hugepd
On 32-bit book-e machines, hugepd_ok() no longer takes into account null
hugepd values, causing this crash at boot:
Unable to handle kernel paging request for data at address 0x80000000
...
NIP [c0018378] follow_huge_addr+0x38/0xf0
LR [c001836c] follow_huge_addr+0x2c/0xf0
Call Trace:
follow_huge_addr+0x2c/0xf0 (unreliable)
follow_page_mask+0x40/0x3e0
__get_user_pages+0xc8/0x450
get_user_pages_remote+0x8c/0x250
copy_strings+0x110/0x390
copy_strings_kernel+0x2c/0x50
do_execveat_common+0x478/0x630
do_execve+0x2c/0x40
try_to_run_init_process+0x18/0x60
kernel_init+0xbc/0x110
ret_from_kernel_thread+0x5c/0x64
This impacts all nxp (ex-freescale) 32-bit booke platforms.
This was caused by the change of hugepd_t.pd from signed to unsigned,
and the update to the nohash version of hugepd_ok(). Previously
hugepd_ok() could exclude all non-huge and NULL pgds using > 0, whereas
now we need to explicitly check that the value is not zero and also that
PD_HUGE is *clear*.
This isn't protected by the pgd_none() check in __find_linux_pte_or_hugepte()
because on 32-bit we use pgtable-nopud.h, which causes the pgd_none()
check to be always false.
Fixes: 20717e1ff526 ("powerpc/mm: Fix little-endian 4K hugetlb")
Cc: stable@vger.kernel.org # v4.7+
Reported-by: Madalin-Cristian Bucur <madalin.bucur@nxp.com>
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
[mpe: Flesh out change log details.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/pgtable.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index 0cd8a3852763..e5805ad78e12 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -230,7 +230,7 @@ static inline int hugepd_ok(hugepd_t hpd) return ((hpd_val(hpd) & 0x4) != 0); #else /* We clear the top bit to indicate hugepd */ - return ((hpd_val(hpd) & PD_HUGE) == 0); + return (hpd_val(hpd) && (hpd_val(hpd) & PD_HUGE) == 0); #endif } |