system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-06 18:01:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

Probes fixes for v6.8-rc5:

Browse source 
- fprobe: Fix to allocate entry_data_size buffer for each rethook
     instance. This fixes a buffer overrun bug (which leads a kernel
     crash) when fprobe user uses its entry_data in the entry_handler.
 -----BEGIN PGP SIGNATURE-----
 
 iQFPBAABCgA5FiEEh7BulGwFlgAOi5DV2/sHvwUrPxsFAmXhIPgbHG1hc2FtaS5o
 aXJhbWF0c3VAZ21haWwuY29tAAoJENv7B78FKz8bhwIH/1h5q2ZqNwNplDGVQpWU
 G1uuRHLlt47jwbGR3gfeYqVELtX0gFigBsmVouCKK3u3qerB1pDscYhULzKeHjS4
 1HAsonj+vKY2pbdCaRnxRT7ejlEioN8CwPb1eqY6Bf6XQ2tJqS5gUqdej8JDJuY5
 tpNAhHWqAnRvf1V5muclGAIU+9zavrAjbetpgrPEDIjE5idFvN+6D+4PXiM1cRIW
 KXW1oA7VlShdfY7xprSZ33Lx7C/dLWojM2P/z/BvqyXOf4f1ovqtGFJegW4n7V5b
 ZgamgOcSBwFLTVOTpOzn0peucduLFTfEWyC7fFGkHjBxTl2JypsQLEupdoaWLvBB
 el4=
 =bUgZ
 -----END PGP SIGNATURE-----

Merge tag 'probes-fixes-v6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull fprobe fix from Masami Hiramatsu:

 - allocate entry_data_size buffer for each rethook instance.

   This fixes a buffer overrun bug (which leads a kernel crash)
   when fprobe user uses its entry_data in the entry_handler.

* tag 'probes-fixes-v6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  fprobe: Fix to allocate entry_data_size buffer with rethook instances
This commit is contained in:
Linus Torvalds 2024-03-01 11:17:23 -08:00
parent 2f03fc340c 6572786006
commit 161671a6eb
1 changed files with 6 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
kernel/trace/fprobe.c
View file

@ -189,9 +189,6 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
{
int size;
if (num <= 0)
return -EINVAL;
if (!fp->exit_handler) {
fp->rethook = NULL;
return 0;
@ -199,15 +196,16 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
/* Initialize rethook if needed */
if (fp->nr_maxactive)
size = fp->nr_maxactive;
num = fp->nr_maxactive;
else
size = num * num_possible_cpus() * 2;
if (size <= 0)
num *= num_possible_cpus() * 2;
if (num <= 0)
return -EINVAL;
size = sizeof(struct fprobe_rethook_node) + fp->entry_data_size;
/* Initialize rethook */
fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler,
sizeof(struct fprobe_rethook_node), size);
fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler, size, num);
if (IS_ERR(fp->rethook))
return PTR_ERR(fp->rethook);