Messages in this thread | | | Date | Wed, 9 Mar 2022 16:51:04 +0100 | Subject | Re: [PATCH] powerpc/vdso: Fix VDSO unmap check | From | Christophe Leroy <> |
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Le 03/11/2020 à 18:13, Laurent Dufour a écrit : > The check introduced by the commit 83d3f0e90c6c ("powerpc/mm: tracking vDSO > remap") is wrong and is missing some partial unmaps of the VDSO. > > To be complete the check needs the base and end address of the > VDSO. Currently only the base is available in the mm_context of a task, but > the end address can easily be computed because the size of VDSO is > constant. However, there are 2 sizes for 32 or 64 bits task and they are > stored in static variables in arch/powerpc/kernel/vdso.c. > > Exporting a new function called vdso_pages() to get the number of pages of > the VDSO based on the static variables from arch/powerpc/kernel/vdso.c. > > Fixes: 83d3f0e90c6c ("powerpc/mm: tracking vDSO remap") > > Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com> > Reported-by: Thomas Gleixner <tglx@linutronix.de> > Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Cc: Paul Mackerras <paulus@samba.org> > --- > arch/powerpc/include/asm/mmu_context.h | 18 ++++++++++++++++-- > arch/powerpc/kernel/vdso.c | 14 ++++++++++++++ > 2 files changed, 30 insertions(+), 2 deletions(-)
This patch doesn't apply anymore.
In the meantime there's a pending series from Dmitry, so I'm wondering if it is worth rebasing this series or not.
Christophe
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