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

Merge pull request #114 from WorksButNotTested/dontdump

Browse Source 
Support madvise(MADV_DONTDUMP) when creating core dumps for qemu-user
This commit is contained in:
Romain Malmain 2025-05-02 22:20:31 +02:00 committed by GitHub
commit d20fb07d99
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
3 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/exec/page-protection.h
View File

@ -38,6 +38,12 @@
*/ */
#define PAGE_PASSTHROUGH 0x0800 #define PAGE_PASSTHROUGH 0x0800
/*
* For linux-user, indicates that the page should not be included in a core
* dump.
*/
#define PAGE_DONTDUMP 0x1000
#ifdef CONFIG_USER_ONLY #ifdef CONFIG_USER_ONLY
void TSA_NO_TSA mmap_lock(void); void TSA_NO_TSA mmap_lock(void);

4
linux-user/elfload.c
View File

@ -4068,6 +4068,10 @@ static size_t vma_dump_size(target_ulong start, target_ulong end,
return 0; return 0;
} }
if (flags & PAGE_DONTDUMP) {
return 0;
}
/* /*
* Usually we don't dump executable pages as they contain * Usually we don't dump executable pages as they contain
* non-writable code that debugger can read directly from * non-writable code that debugger can read directly from

5
linux-user/mmap.c
View File

@ -1246,6 +1246,11 @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
*/ */
mmap_lock(); mmap_lock();
switch (advice) { switch (advice) {
case MADV_DONTDUMP:
if (len > 0) {
page_set_flags(start, start + len - 1, PAGE_DONTDUMP);
}
break;
case MADV_WIPEONFORK: case MADV_WIPEONFORK:
case MADV_KEEPONFORK: case MADV_KEEPONFORK:
ret = -EINVAL; ret = -EINVAL;