[PATCH] prctl.2: Add note regarding the size of the output user space buffer for PR_GET_TID_ADDRESS operation on x32/n32
From: Eugene Syromyatnikov <hidden>
Date: 2016-12-12 03:54:41
Subsystem:
the rest · Maintainer:
Linus Torvalds
--- man2/prctl.2 | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index 5f84bb7..39b3e9a 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2@@ -988,7 +988,10 @@ flag, in the location pointed to by .IR "(int\ **)\ arg2" . This feature is available only if the kernel is built with the .BR CONFIG_CHECKPOINT_RESTORE -option enabled. +option enabled. Note that since the prctl() syscall does not have compat +implementation for AMD64 x32 and MIPS n32 ABIs, and the kernel writes out +pointer of kernel's pointer size, this operation expects a user space buffer +of 8 (not 4) bytes on these ABIs. .TP .BR PR_SET_TIMERSLACK " (since Linux 2.6.28)" .\" See https://lwn.net/Articles/369549/
--
2.10.2
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