linux-kernel - [PATCH v3] powerpc/vdso: fix clock_gettime

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <0c0ab0eb3cc80687c326f76ff0dd5762b8812ecc.1610452505.git.christophe.leroy@csgroup.eu>
Date:   Tue, 12 Jan 2021 11:55:15 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, schwab@...ux-m68k.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3] powerpc/vdso: fix clock_gettime_fallback for vdso32

From: Andreas Schwab <schwab@...ux-m68k.org>

The second argument of __kernel_clock_gettime64 points to a struct
__kernel_timespec, with 64-bit time_t, so use the clock_gettime64 syscall
in the fallback function for the 32-bit vdso.  Similarily,
clock_getres_fallback should use the clock_getres_time64 syscall, though
it isn't yet called from the 32-bit vdso.

Signed-off-by: Andreas Schwab <schwab@...ux-m68k.org>
[chleroy: Moved into a single #ifdef __powerpc64__ block]
Fixes: d0e3fc69d00d ("powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32")
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/vdso/gettimeofday.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h
index 7a215cc5da77..d453e725c79f 100644
--- a/arch/powerpc/include/asm/vdso/gettimeofday.h
+++ b/arch/powerpc/include/asm/vdso/gettimeofday.h
@@ -102,6 +102,8 @@ int gettimeofday_fallback(struct __kernel_old_timeval *_tv, struct timezone *_tz
 	return do_syscall_2(__NR_gettimeofday, (unsigned long)_tv, (unsigned long)_tz);
 }
 
+#ifdef __powerpc64__
+
 static __always_inline
 int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
 {
@@ -114,10 +116,22 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
 	return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts);
 }
 
-#ifdef CONFIG_VDSO32
+#else
 
 #define BUILD_VDSO32		1
 
+static __always_inline
+int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
+{
+	return do_syscall_2(__NR_clock_gettime64, _clkid, (unsigned long)_ts);
+}
+
+static __always_inline
+int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
+{
+	return do_syscall_2(__NR_clock_getres_time64, _clkid, (unsigned long)_ts);
+}
+
 static __always_inline
 int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
 {
-- 
2.25.0