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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-25 09:33:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-25 09:33:03 -0700 |
| commit | 5566051fa67352af069e0eb4b047f2b832b9a1cc (patch) | |
| tree | 8ddc016c4b0de38cd0467502a5d571fb3e38c380 /arch | |
| parent | 933174ae28ba72ab8de5b35cb7c98fc211235096 (diff) | |
| parent | b845b574f86dcb6a70dfa698aa87a237b0878d2a (diff) | |
| download | lwn-5566051fa67352af069e0eb4b047f2b832b9a1cc.tar.gz lwn-5566051fa67352af069e0eb4b047f2b832b9a1cc.zip | |
Merge tag 'm68k-for-v6.4-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k
Pull m68k fix from Geert Uytterhoeven:
- Fix signal frame issue causing user-space crashes on 68020/68030
* tag 'm68k-for-v6.4-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
m68k: Move signal frame following exception on 68020/030
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/m68k/kernel/signal.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index b9f6908a31bc..ba468b5f3f0b 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -858,11 +858,17 @@ static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs * } static inline void __user * -get_sigframe(struct ksignal *ksig, size_t frame_size) +get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size) { unsigned long usp = sigsp(rdusp(), ksig); + unsigned long gap = 0; - return (void __user *)((usp - frame_size) & -8UL); + if (CPU_IS_020_OR_030 && tregs->format == 0xb) { + /* USP is unreliable so use worst-case value */ + gap = 256; + } + + return (void __user *)((usp - gap - frame_size) & -8UL); } static int setup_frame(struct ksignal *ksig, sigset_t *set, @@ -880,7 +886,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set, return -EFAULT; } - frame = get_sigframe(ksig, sizeof(*frame) + fsize); + frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize); if (fsize) err |= copy_to_user (frame + 1, regs + 1, fsize); @@ -952,7 +958,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, return -EFAULT; } - frame = get_sigframe(ksig, sizeof(*frame)); + frame = get_sigframe(ksig, tregs, sizeof(*frame)); if (fsize) err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); |