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sh: sanitize the flags on sigreturn
[ Upstream commit 573b22ccb7
]
We fetch %SR value from sigframe; it might have been modified by signal
handler, so we can't trust it with any bits that are not modifiable in
user mode.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Rich Felker <dalias@libc.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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2 changed files with 4 additions and 0 deletions
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@ -50,6 +50,7 @@
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#define SR_FD 0x00008000
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#define SR_MD 0x40000000
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#define SR_USER_MASK 0x00000303 // M, Q, S, T bits
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/*
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* DSP structure and data
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*/
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@ -115,6 +115,7 @@ static int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
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{
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unsigned int err = 0;
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unsigned int sr = regs->sr & ~SR_USER_MASK;
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#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
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COPY(regs[1]);
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@ -130,6 +131,8 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p
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COPY(sr); COPY(pc);
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#undef COPY
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regs->sr = (regs->sr & SR_USER_MASK) | sr;
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#ifdef CONFIG_SH_FPU
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if (boot_cpu_data.flags & CPU_HAS_FPU) {
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int owned_fp;
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