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[PATCH 4/5] linux-user: Do nothing if too small brk is specified
From: |
Akihiko Odaki |
Subject: |
[PATCH 4/5] linux-user: Do nothing if too small brk is specified |
Date: |
Mon, 31 Jul 2023 17:03:13 +0900 |
Linux 6.4.7 does nothing when a value smaller than the initial brk is
specified.
Fixes: 86f04735ac ("linux-user: Fix brk() to release pages")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
linux-user/syscall.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ac429a185a..ebdc8c144c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -820,14 +820,14 @@ abi_long do_brk(abi_ulong brk_val)
/* brk pointers are always untagged */
- /* return old brk value if brk_val unchanged or zero */
- if (!brk_val || brk_val == target_brk) {
+ /* return old brk value if brk_val unchanged */
+ if (brk_val == target_brk) {
return target_brk;
}
/* do not allow to shrink below initial brk value */
if (brk_val < initial_target_brk) {
- brk_val = initial_target_brk;
+ return target_brk;
}
new_brk = TARGET_PAGE_ALIGN(brk_val);
--
2.41.0