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| author | Jakub Kicinski <[email protected]> | 2025-02-20 18:36:34 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2025-02-20 18:37:30 +0000 |
| commit | 5d6ba5ab8582aa35c1ee98e47af28e6f6772596c (patch) | |
| tree | a4a3a2d311773c19909c9928273e0bcae01a39ce /arch/x86/um/signal.c | |
| parent | Merge tag 'linux-can-next-for-6.15-20250219' of git://git.kernel.org/pub/scm/... (diff) | |
| parent | Merge tag 'net-6.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/net... (diff) | |
| download | kernel-5d6ba5ab8582aa35c1ee98e47af28e6f6772596c.tar.gz kernel-5d6ba5ab8582aa35c1ee98e47af28e6f6772596c.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR (net-6.14-rc4).
No conflicts or adjacent changes.
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'arch/x86/um/signal.c')
| -rw-r--r-- | arch/x86/um/signal.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c index 75087e85b6fd..2934e170b0fe 100644 --- a/arch/x86/um/signal.c +++ b/arch/x86/um/signal.c @@ -187,7 +187,12 @@ static int copy_sc_to_user(struct sigcontext __user *to, * Put magic/size values for userspace. We do not bother to verify them * later on, however, userspace needs them should it try to read the * XSTATE data. And ptrace does not fill in these parts. + * + * Skip this if we do not have an XSTATE frame. */ + if (host_fp_size <= sizeof(to_fp64->fpstate)) + return 0; + BUILD_BUG_ON(sizeof(int) != FP_XSTATE_MAGIC2_SIZE); #ifdef CONFIG_X86_32 __put_user(offsetof(struct _fpstate_32, _fxsr_env) + @@ -367,11 +372,13 @@ int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig, int err = 0, sig = ksig->sig; unsigned long fp_to; - frame = (struct rt_sigframe __user *) - round_down(stack_top - sizeof(struct rt_sigframe), 16); + frame = (void __user *)stack_top - sizeof(struct rt_sigframe); /* Add required space for math frame */ - frame = (struct rt_sigframe __user *)((unsigned long)frame - math_size); + frame = (void __user *)((unsigned long)frame - math_size); + + /* ABI requires 16 byte boundary alignment */ + frame = (void __user *)round_down((unsigned long)frame, 16); /* Subtract 128 for a red zone and 8 for proper alignment */ frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8); |