diff options
| author | Kevin Brodsky <kevin.brodsky@arm.com> | 2016-05-12 10:55:47 +0100 |
|---|---|---|
| committer | Davide Garberi <dade.garberi@gmail.com> | 2021-10-07 16:16:10 +0200 |
| commit | 1119a05421481edebd415d4da5511b59530844a3 (patch) | |
| tree | 0dde33b680d6e222c626312f5d4fc198299d0d52 | |
| parent | db554e377d5ad657f691c3335894b9e6e1e9469d (diff) | |
FROMLIST: [PATCH 1/6] arm64: compat: Use vDSO sigreturn trampolines if available
(cherry pick from url https://patchwork.kernel.org/patch/10060449/)
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 <kevin.brodsky@arm.com>
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Bug: 63737556
Bug: 20045882
Change-Id: Ic0933741e321e1bf66409b7e190a776f12948024
| -rw-r--r-- | arch/arm64/include/asm/vdso.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/signal32.c | 15 |
2 files changed, 18 insertions, 0 deletions
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 7f6031da15fc..666363d127e5 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -28,6 +28,7 @@ #include <asm/signal32.h> #include <asm/uaccess.h> #include <asm/unistd.h> +#include <asm/vdso.h> struct compat_vfp_sigframe { compat_ulong_t magic; @@ -438,6 +439,19 @@ 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; @@ -445,6 +459,7 @@ 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; |