Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
MIPS: kernel: Fix random segmentation faults
Commit 69896119dc9d ("MIPS: vdso: Switch to generic storage
implementation") switches to a generic vdso storage, which increases
the number of data pages from 1 to 4. But there is only one page
reserved, which causes segementation faults depending where the VDSO
area is randomized to. To fix this use the same size of reservation
and allocation of the VDSO data pages.
Fixes: 69896119dc9d ("MIPS: vdso: Switch to generic storage implementation")
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
+1
-1
+1
-1
arch/mips/kernel/process.c
+1
-1
arch/mips/kernel/process.c
···
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/* Space for the VDSO, data page & GIC user page */
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if (current->thread.abi) {
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top -= PAGE_ALIGN(current->thread.abi->vdso->size);
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-
top -= PAGE_SIZE;
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+
top -= VDSO_NR_PAGES * PAGE_SIZE;
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top -= mips_gic_present() ? PAGE_SIZE : 0;
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/* Space to randomize the VDSO base */