[PATCH 16/16] x86: add ia32 compat prlimit syscalls

[Jiri Slaby]

To support 32/64-bit compatibility (rlimit structure contains 2 longs)
for prlimit syscalls, add compat wrappers for them.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
---
 arch/x86/ia32/ia32entry.S |    2 ++
 kernel/compat.c           |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 581b056..c61ced2 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -841,4 +841,6 @@ ia32_sys_call_table:
 	.quad compat_sys_pwritev
 	.quad compat_sys_rt_tgsigqueueinfo	/* 335 */
 	.quad sys_perf_event_open
+	.quad compat_sys_getprlimit
+	.quad compat_sys_setprlimit
 ia32_syscall_end:
diff --git a/kernel/compat.c b/kernel/compat.c
index af15719..97fda34 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -371,6 +371,38 @@ asmlinkage long compat_sys_getrlimit (unsigned int resource,
 	return ret;
 }
 
+asmlinkage long compat_sys_setprlimit(pid_t pid, unsigned int resource,
+		struct compat_rlimit __user *rlim)
+{
+	mm_segment_t old_fs = get_fs ();
+	struct rlimit r;
+	int ret;
+
+	ret = get_compat_rlimit(&r, rlim);
+	if (ret)
+		return ret;
+
+	set_fs(KERNEL_DS);
+	ret = sys_setprlimit(pid, resource, (struct rlimit __force __user *)&r);
+	set_fs(old_fs);
+	return ret;
+}
+
+asmlinkage long compat_sys_getprlimit(pid_t pid, unsigned int resource,
+		struct compat_rlimit __user *rlim)
+{
+	mm_segment_t old_fs = get_fs();
+	struct rlimit r;
+	int ret;
+
+	set_fs(KERNEL_DS);
+	ret = sys_getprlimit(pid, resource, (struct rlimit __force __user *)&r);
+	set_fs(old_fs);
+	if (!ret)
+		ret = put_compat_rlimit(&r, rlim);
+	return ret;
+}
+
 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 {
 	if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
-- 
1.6.4.2

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