SYS-OSS/FRET-qemu
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

linux-user: Do nothing if too small brk is specified

Browse Source 
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")
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20230802071754.14876-6-akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Akihiko Odaki 2023-08-02 16:17:51 +09:00 committed by Richard Henderson
parent e69e032d1a
commit cb9d5d1fda
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
linux-user/syscall.c
View File

@ -820,14 +820,14 @@ abi_long do_brk(abi_ulong brk_val)
/* brk pointers are always untagged */ /* brk pointers are always untagged */
/* return old brk value if brk_val unchanged or zero */ /* return old brk value if brk_val unchanged */
if (!brk_val || brk_val == target_brk) { if (brk_val == target_brk) {
return target_brk; return target_brk;
} }
/* do not allow to shrink below initial brk value */ /* do not allow to shrink below initial brk value */
if (brk_val < initial_target_brk) { if (brk_val < initial_target_brk) {
brk_val = initial_target_brk; return target_brk;
} }
new_brk = TARGET_PAGE_ALIGN(brk_val); new_brk = TARGET_PAGE_ALIGN(brk_val);