diff options
| author | Benjamin Berg <benjamin.berg@intel.com> | 2024-09-19 14:45:09 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-10-10 13:37:22 +0200 |
| commit | 68b9883cc16ec2ce699d832ef60241b1a4e47d33 (patch) | |
| tree | 643472cca34b474083cf41dd9859840648c2e8f8 /arch/um/include/shared | |
| parent | 830003c73d190259e45d0a99a0e3d14cb73e0af0 (diff) | |
um: Discover host_task_size from envp
When loading the UML binary, the host kernel will place the stack at the
highest possible address. It will then map the program name and
environment variables onto the start of the stack.
As such, an easy way to figure out the host_task_size is to use the
highest pointer to an environment variable as a reference.
Ensure that this works by disabling address layout randomization and
re-executing UML in case it was enabled.
This increases the available TASK_SIZE for 64 bit UML considerably.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240919124511.282088-9-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/include/shared')
| -rw-r--r-- | arch/um/include/shared/as-layout.h | 2 | ||||
| -rw-r--r-- | arch/um/include/shared/os.h | 3 |
2 files changed, 1 insertions, 4 deletions
diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h index 283226c34ca4..d9679c911e54 100644 --- a/arch/um/include/shared/as-layout.h +++ b/arch/um/include/shared/as-layout.h @@ -49,7 +49,7 @@ extern unsigned long brk_start; extern unsigned long host_task_size; extern unsigned long stub_start; -extern int linux_main(int argc, char **argv); +extern int linux_main(int argc, char **argv, char **envp); extern void uml_finishsetup(void); struct siginfo; diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h index b511637e1f76..bf539fee7831 100644 --- a/arch/um/include/shared/os.h +++ b/arch/um/include/shared/os.h @@ -325,9 +325,6 @@ extern int __ignore_sigio_fd(int fd); /* tty.c */ extern int get_pty(void); -/* sys-$ARCH/task_size.c */ -extern unsigned long os_get_top_address(void); - long syscall(long number, ...); /* irqflags tracing */ |