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sh: sanitize the flags on sigreturn

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[ 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>
This commit is contained in:
Al Viro 2023-03-06 01:20:30 +00:00 • committed by Justin Hammond
parent a8258ef9ad
commit e5e8550bba
2 changed files with 4 additions and 0 deletions
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1
arch/sh/include/asm/processor_32.h
View file

@ -50,6 +50,7 @@
#define SR_FD 0x00008000
#define SR_MD 0x40000000
#define SR_USER_MASK 0x00000303 // M, Q, S, T bits
/*
* DSP structure and data
*/

3
arch/sh/kernel/signal_32.c
View file

@ -115,6 +115,7 @@ static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
{
unsigned int err = 0;
unsigned int sr = regs->sr & ~SR_USER_MASK;
#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
COPY(regs[1]);
@ -130,6 +131,8 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p
COPY(sr); COPY(pc);
#undef COPY
regs->sr = (regs->sr & SR_USER_MASK) | sr;
#ifdef CONFIG_SH_FPU
if (boot_cpu_data.flags & CPU_HAS_FPU) {
int owned_fp;