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A single bug fix for the common entry code. The transcript of the x86

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version messed up the reload of the syscall number from pt_regs after
 ptrace and seccomp which breaks syscall number rewriting.
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Merge tag 'core-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull entry fix from Thomas Gleixner:
 "A single bug fix for the common entry code.

  The transcription of the x86 version messed up the reload of the
  syscall number from pt_regs after ptrace and seccomp which breaks
  syscall number rewriting"

* tag 'core-urgent-2020-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  core/entry: Respect syscall number rewrites
This commit is contained in:
Linus Torvalds 2020-08-23 11:05:47 -07:00
commit e99b2507ba
1 changed files with 2 additions and 1 deletions
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3
kernel/entry/common.c
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@ -65,7 +65,8 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
syscall_enter_audit(regs, syscall);
return ret ? : syscall;
/* The above might have changed the syscall number */
return ret ? : syscall_get_nr(current, regs);
}
noinstr long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall)