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powerpc/signal32: Convert restore_[tm]_user_regs() to user access block
Convert restore_user_regs() and restore_tm_user_regs() to use user_access_read_begin/end blocks. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/181adf15a6f644efcd1aeafb355f3578ff1b6bc5.1616151715.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
Michael Ellerman
parent
036fc2cb1d
commit
627b72bee8
@ -245,7 +245,7 @@ static inline bool trap_norestart(struct pt_regs *regs)
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return regs->trap & 0x10;
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}
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static inline void set_trap_norestart(struct pt_regs *regs)
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static __always_inline void set_trap_norestart(struct pt_regs *regs)
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{
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regs->trap |= 0x10;
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}
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@ -116,8 +116,8 @@ failed:
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return 1;
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}
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static inline int restore_general_regs(struct pt_regs *regs,
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struct mcontext __user *sr)
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static __always_inline int
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__unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr)
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{
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elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
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int i;
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@ -125,10 +125,12 @@ static inline int restore_general_regs(struct pt_regs *regs,
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for (i = 0; i <= PT_RESULT; i++) {
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if ((i == PT_MSR) || (i == PT_SOFTE))
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continue;
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if (__get_user(gregs[i], &sr->mc_gregs[i]))
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return -EFAULT;
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unsafe_get_user(gregs[i], &sr->mc_gregs[i], failed);
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}
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return 0;
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failed:
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return 1;
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}
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#else /* CONFIG_PPC64 */
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@ -161,18 +163,20 @@ failed:
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return 1;
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}
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static inline int restore_general_regs(struct pt_regs *regs,
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struct mcontext __user *sr)
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static __always_inline
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int __unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr)
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{
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/* copy up to but not including MSR */
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if (__copy_from_user(regs, &sr->mc_gregs,
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PT_MSR * sizeof(elf_greg_t)))
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return -EFAULT;
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unsafe_copy_from_user(regs, &sr->mc_gregs, PT_MSR * sizeof(elf_greg_t), failed);
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/* copy from orig_r3 (the word after the MSR) up to the end */
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if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
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GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
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return -EFAULT;
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unsafe_copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
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GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t), failed);
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return 0;
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failed:
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return 1;
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}
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#endif
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@ -181,6 +185,11 @@ static inline int restore_general_regs(struct pt_regs *regs,
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goto label; \
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} while (0)
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#define unsafe_restore_general_regs(regs, frame, label) do { \
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if (__unsafe_restore_general_regs(regs, frame)) \
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goto label; \
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} while (0)
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/*
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* When we have signals to deliver, we set up on the
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* user stack, going down from the original stack pointer:
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@ -485,14 +494,13 @@ static int save_tm_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user
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static long restore_user_regs(struct pt_regs *regs,
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struct mcontext __user *sr, int sig)
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{
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long err;
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unsigned int save_r2 = 0;
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unsigned long msr;
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#ifdef CONFIG_VSX
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int i;
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#endif
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if (!access_ok(sr, sizeof(*sr)))
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if (!user_read_access_begin(sr, sizeof(*sr)))
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return 1;
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/*
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* restore general registers but not including MSR or SOFTE. Also
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@ -500,13 +508,11 @@ static long restore_user_regs(struct pt_regs *regs,
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*/
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if (!sig)
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save_r2 = (unsigned int)regs->gpr[2];
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err = restore_general_regs(regs, sr);
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unsafe_restore_general_regs(regs, sr, failed);
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set_trap_norestart(regs);
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err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
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unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed);
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if (!sig)
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regs->gpr[2] = (unsigned long) save_r2;
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if (err)
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return 1;
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/* if doing signal return, restore the previous little-endian mode */
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if (sig)
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@ -520,22 +526,19 @@ static long restore_user_regs(struct pt_regs *regs,
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regs->msr &= ~MSR_VEC;
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if (msr & MSR_VEC) {
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/* restore altivec registers from the stack */
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if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
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sizeof(sr->mc_vregs)))
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return 1;
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unsafe_copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
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sizeof(sr->mc_vregs), failed);
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current->thread.used_vr = true;
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} else if (current->thread.used_vr)
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memset(¤t->thread.vr_state, 0,
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ELF_NVRREG * sizeof(vector128));
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/* Always get VRSAVE back */
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if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
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return 1;
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unsafe_get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32], failed);
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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mtspr(SPRN_VRSAVE, current->thread.vrsave);
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#endif /* CONFIG_ALTIVEC */
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if (copy_fpr_from_user(current, &sr->mc_fregs))
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return 1;
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unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed);
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#ifdef CONFIG_VSX
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/*
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@ -548,8 +551,7 @@ static long restore_user_regs(struct pt_regs *regs,
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* Restore altivec registers from the stack to a local
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* buffer, then write this out to the thread_struct
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*/
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if (copy_vsx_from_user(current, &sr->mc_vsregs))
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return 1;
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unsafe_copy_vsx_from_user(current, &sr->mc_vsregs, failed);
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current->thread.used_vsr = true;
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} else if (current->thread.used_vsr)
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for (i = 0; i < 32 ; i++)
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@ -567,19 +569,22 @@ static long restore_user_regs(struct pt_regs *regs,
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regs->msr &= ~MSR_SPE;
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if (msr & MSR_SPE) {
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/* restore spe registers from the stack */
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if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
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ELF_NEVRREG * sizeof(u32)))
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return 1;
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unsafe_copy_from_user(current->thread.evr, &sr->mc_vregs,
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ELF_NEVRREG * sizeof(u32));
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current->thread.used_spe = true;
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} else if (current->thread.used_spe)
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memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
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/* Always get SPEFSCR back */
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if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
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return 1;
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unsafe_get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG, failed);
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#endif /* CONFIG_SPE */
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user_read_access_end();
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return 0;
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failed:
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user_read_access_end();
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return 1;
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}
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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@ -592,7 +597,6 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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struct mcontext __user *sr,
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struct mcontext __user *tm_sr)
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{
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long err;
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unsigned long msr, msr_hi;
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#ifdef CONFIG_VSX
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int i;
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@ -607,14 +611,13 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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* TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
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* were set by the signal delivery.
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*/
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err = restore_general_regs(¤t->thread.ckpt_regs, sr);
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err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
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err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
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if (err)
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if (!user_read_access_begin(sr, sizeof(*sr)))
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return 1;
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unsafe_restore_general_regs(¤t->thread.ckpt_regs, sr, failed);
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unsafe_get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP], failed);
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unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed);
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/* Restore the previous little-endian mode */
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regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
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@ -622,9 +625,8 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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regs->msr &= ~MSR_VEC;
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if (msr & MSR_VEC) {
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/* restore altivec registers from the stack */
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if (__copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
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sizeof(sr->mc_vregs)))
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return 1;
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unsafe_copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
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sizeof(sr->mc_vregs), failed);
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current->thread.used_vr = true;
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} else if (current->thread.used_vr) {
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memset(¤t->thread.vr_state, 0,
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@ -634,17 +636,15 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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}
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/* Always get VRSAVE back */
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if (__get_user(current->thread.ckvrsave,
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(u32 __user *)&sr->mc_vregs[32]))
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return 1;
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unsafe_get_user(current->thread.ckvrsave,
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(u32 __user *)&sr->mc_vregs[32], failed);
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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mtspr(SPRN_VRSAVE, current->thread.ckvrsave);
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#endif /* CONFIG_ALTIVEC */
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regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
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if (copy_fpr_from_user(current, &sr->mc_fregs))
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return 1;
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unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed);
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#ifdef CONFIG_VSX
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regs->msr &= ~MSR_VSX;
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@ -653,8 +653,7 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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* Restore altivec registers from the stack to a local
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* buffer, then write this out to the thread_struct
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*/
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if (copy_ckvsx_from_user(current, &sr->mc_vsregs))
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return 1;
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unsafe_copy_ckvsx_from_user(current, &sr->mc_vsregs, failed);
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current->thread.used_vsr = true;
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} else if (current->thread.used_vsr)
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for (i = 0; i < 32 ; i++) {
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@ -669,39 +668,36 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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*/
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regs->msr &= ~MSR_SPE;
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if (msr & MSR_SPE) {
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if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
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ELF_NEVRREG * sizeof(u32)))
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return 1;
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unsafe_copy_from_user(current->thread.evr, &sr->mc_vregs,
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ELF_NEVRREG * sizeof(u32), failed);
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current->thread.used_spe = true;
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} else if (current->thread.used_spe)
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memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
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/* Always get SPEFSCR back */
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if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
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+ ELF_NEVRREG))
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return 1;
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unsafe_get_user(current->thread.spefscr,
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(u32 __user *)&sr->mc_vregs + ELF_NEVRREG, failed);
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#endif /* CONFIG_SPE */
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err = restore_general_regs(regs, tm_sr);
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if (err)
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user_read_access_end();
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if (!user_read_access_begin(tm_sr, sizeof(*tm_sr)))
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return 1;
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unsafe_restore_general_regs(regs, tm_sr, failed);
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#ifdef CONFIG_ALTIVEC
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/* restore altivec registers from the stack */
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if (msr & MSR_VEC)
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if (__copy_from_user(¤t->thread.vr_state,
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&tm_sr->mc_vregs,
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sizeof(sr->mc_vregs)))
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return 1;
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unsafe_copy_from_user(¤t->thread.vr_state, &tm_sr->mc_vregs,
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sizeof(sr->mc_vregs), failed);
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/* Always get VRSAVE back */
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if (__get_user(current->thread.vrsave,
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(u32 __user *)&tm_sr->mc_vregs[32]))
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return 1;
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unsafe_get_user(current->thread.vrsave,
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(u32 __user *)&tm_sr->mc_vregs[32], failed);
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#endif /* CONFIG_ALTIVEC */
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if (copy_ckfpr_from_user(current, &tm_sr->mc_fregs))
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return 1;
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unsafe_copy_ckfpr_from_user(current, &tm_sr->mc_fregs, failed);
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#ifdef CONFIG_VSX
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if (msr & MSR_VSX) {
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@ -709,16 +705,17 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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* Restore altivec registers from the stack to a local
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* buffer, then write this out to the thread_struct
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*/
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if (copy_vsx_from_user(current, &tm_sr->mc_vsregs))
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return 1;
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unsafe_copy_vsx_from_user(current, &tm_sr->mc_vsregs, failed);
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current->thread.used_vsr = true;
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}
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#endif /* CONFIG_VSX */
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/* Get the top half of the MSR from the user context */
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if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
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return 1;
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unsafe_get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR], failed);
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msr_hi <<= 32;
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user_read_access_end();
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/* If TM bits are set to the reserved value, it's an invalid context */
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if (MSR_TM_RESV(msr_hi))
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return 1;
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@ -766,6 +763,10 @@ static long restore_tm_user_regs(struct pt_regs *regs,
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preempt_enable();
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return 0;
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failed:
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user_read_access_end();
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return 1;
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}
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#else
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static long restore_tm_user_regs(struct pt_regs *regs, struct mcontext __user *sr,
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