[uml-devel] [patch 37/49] uml: work around broken host PTRACE_SYSEMU
From: Greg KH <gregkh@suse.de>
Date: 2008-08-18 19:44:18
Also in:
lkml
2.6.25-stable review patch. If anyone has any objections, please let us know. ------------------ From: Jeff Dike <redacted> commit f1ef9167ca4494a8c6d71d0031c73e9c8841eadd upstream Fedora broke PTRACE_SYSEMU again, and UML crashes as a result when it doesn't need to. This patch makes the PTRACE_SYSEMU check fail gracefully and makes UML fall back to PTRACE_SYSCALL. Signed-off-by: Jeff Dike <redacted> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/um/os-Linux/start_up.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-)
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c@@ -122,8 +122,10 @@ static int stop_ptraced_child(int pid, i { int status, n, ret = 0; - if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) - fatal_perror("stop_ptraced_child : ptrace failed"); + if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) { + perror("stop_ptraced_child : ptrace failed"); + return -1; + } CATCH_EINTR(n = waitpid(pid, &status, 0)); if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) { int exit_with = WEXITSTATUS(status);
@@ -203,7 +205,7 @@ static void __init check_sysemu(void) if (n < 0) fatal_perror("check_sysemu : wait failed"); if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP)) - fatal("check_sysemu : expected SIGTRAP, got status = %d", + fatal("check_sysemu : expected SIGTRAP, got status = %d\n", status); if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
@@ -245,9 +247,11 @@ static void __init check_sysemu(void) if (WIFSTOPPED(status) && (WSTOPSIG(status) == (SIGTRAP|0x80))) { - if (!count) - fatal("check_ptrace : SYSEMU_SINGLESTEP " - "doesn't singlestep"); + if (!count) { + non_fatal("check_ptrace : SYSEMU_SINGLESTEP " + "doesn't singlestep"); + goto fail; + } n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, os_getpid()); if (n < 0)
@@ -257,9 +261,12 @@ static void __init check_sysemu(void) } else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP)) count++; - else - fatal("check_ptrace : expected SIGTRAP or " - "(SIGTRAP | 0x80), got status = %d", status); + else { + non_fatal("check_ptrace : expected SIGTRAP or " + "(SIGTRAP | 0x80), got status = %d\n", + status); + goto fail; + } } if (stop_ptraced_child(pid, 0, 0) < 0) goto fail_stopped;
--
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