From: Kevin Brodsky <[email protected]> If the compat vDSO is enabled, it replaces the sigreturn page. Therefore, we use the sigreturn trampolines the vDSO provides instead.
Signed-off-by: Kevin Brodsky <[email protected]> Signed-off-by: Mark Salyzyn <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: Dave Martin <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: [email protected] Cc: [email protected] --- arch/arm64/include/asm/vdso.h | 3 +++ arch/arm64/kernel/signal32.c | 15 +++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm64/include/asm/vdso.h b/arch/arm64/include/asm/vdso.h index 839ce0031bd5..f2a952338f1e 100644 --- a/arch/arm64/include/asm/vdso.h +++ b/arch/arm64/include/asm/vdso.h @@ -28,6 +28,9 @@ #ifndef __ASSEMBLY__ #include <generated/vdso-offsets.h> +#ifdef CONFIG_VDSO32 +#include <generated/vdso32-offsets.h> +#endif #define VDSO_SYMBOL(base, name) \ ({ \ diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 4f0c0aa14cba..37095782622d 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -28,6 +28,7 @@ #include <asm/signal32.h> #include <linux/uaccess.h> #include <asm/unistd.h> +#include <asm/vdso.h> struct compat_vfp_sigframe { compat_ulong_t magic; @@ -433,6 +434,19 @@ static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, retcode = ptr_to_compat(ka->sa.sa_restorer); } else { /* Set up sigreturn pointer */ +#ifdef CONFIG_VDSO32 + void *vdso_base = current->mm->context.vdso; + void *trampoline = + (ka->sa.sa_flags & SA_SIGINFO + ? (thumb + ? VDSO_SYMBOL(vdso_base, compat_rt_sigreturn_thumb) + : VDSO_SYMBOL(vdso_base, compat_rt_sigreturn_arm)) + : (thumb + ? VDSO_SYMBOL(vdso_base, compat_sigreturn_thumb) + : VDSO_SYMBOL(vdso_base, compat_sigreturn_arm))); + + retcode = ptr_to_compat(trampoline) + thumb; +#else void *sigreturn_base = current->mm->context.vdso; unsigned int idx = thumb << 1; @@ -440,6 +454,7 @@ static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, idx += 3; retcode = ptr_to_compat(sigreturn_base) + (idx << 2) + thumb; +#endif } regs->regs[0] = usig; -- 2.15.0.448.gf294e3d99a-goog
