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update patches loading to support v6.1.0 and cpu-max
Signed-off-by: Tonis Tiigi <[email protected]>
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90 changes: 90 additions & 0 deletions
90
...ildkit-direct-execve-v6.0/0001-linux-user-have-execve-call-qemu-via-proc-self-exe-t.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| From dc472d34ed686cba2804f254e3d803904791eaf6 Mon Sep 17 00:00:00 2001 | ||
| From: Tibor Vass <[email protected]> | ||
| Date: Mon, 1 Jun 2020 23:08:25 +0000 | ||
| Subject: [PATCH 1/5] linux-user: have execve call qemu via /proc/self/exe to | ||
| not rely on binfmt_misc | ||
|
|
||
| It is assumed that when a guest program calls execve syscall it wants to | ||
| execute a program on the same guest architecture and not the host architecture. | ||
|
|
||
| Previously, such a guest program would have execve syscall error out with: | ||
| "exec format error". | ||
|
|
||
| A common solution is to register the qemu binary in binfmt_misc but that is not a | ||
| userland-friendly solution, requiring to modify kernel state. | ||
|
|
||
| This patch injects /proc/self/exe as the first parameter and the qemu program name | ||
| as argv[0] to execve. | ||
|
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||
| Signed-off-by: Tibor Vass <[email protected]> | ||
| (cherry picked from commit bc8e2fdae6cd4f9ff1d487056ca3bc598a3187bc) | ||
| Signed-off-by: Tibor Vass <[email protected]> | ||
| --- | ||
| linux-user/syscall.c | 35 ++++++++++++++++++++++++++++++----- | ||
| 1 file changed, 30 insertions(+), 5 deletions(-) | ||
|
|
||
| diff --git a/linux-user/syscall.c b/linux-user/syscall.c | ||
| index 95d79ddc43..409686fdca 100644 | ||
| --- a/linux-user/syscall.c | ||
| +++ b/linux-user/syscall.c | ||
| @@ -8498,10 +8498,37 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, | ||
| envc++; | ||
| } | ||
|
|
||
| - argp = g_new0(char *, argc + 1); | ||
| + argp = g_new0(char *, argc + 4); | ||
| envp = g_new0(char *, envc + 1); | ||
|
|
||
| - for (gp = guest_argp, q = argp; gp; | ||
| + if (!(p = lock_user_string(arg1))) | ||
| + goto execve_efault; | ||
| + | ||
| + /* if pathname is /proc/self/exe then retrieve the path passed to qemu via command line */ | ||
| + if (is_proc_myself(p, "exe")) { | ||
| + CPUState *cpu = env_cpu((CPUArchState *)cpu_env); | ||
| + TaskState *ts = cpu->opaque; | ||
| + p = ts->bprm->filename; | ||
| + } | ||
| + | ||
| + /* retrieve guest argv0 */ | ||
| + if (get_user_ual(addr, guest_argp)) | ||
| + goto execve_efault; | ||
| + | ||
| + /* | ||
| + * From the guest, the call | ||
| + * execve(pathname, [argv0, argv1], envp) | ||
| + * on the host, becomes: | ||
| + * execve("/proc/self/exe", [qemu_progname, "-0", argv0, pathname, argv1], envp) | ||
| + * where qemu_progname is the error message prefix for qemu | ||
| + */ | ||
| + argp[0] = (char*)error_get_progname(); | ||
| + argp[1] = (char*)"-0"; | ||
| + argp[2] = (char*)lock_user_string(addr); | ||
| + argp[3] = p; | ||
| + | ||
| + /* copy guest argv1 onwards to host argv4 onwards */ | ||
| + for (gp = guest_argp + 1*sizeof(abi_ulong), q = argp + 4; gp; | ||
| gp += sizeof(abi_ulong), q++) { | ||
| if (get_user_ual(addr, gp)) | ||
| goto execve_efault; | ||
| @@ -8525,8 +8552,6 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, | ||
| } | ||
| *q = NULL; | ||
|
|
||
| - if (!(p = lock_user_string(arg1))) | ||
| - goto execve_efault; | ||
| /* Although execve() is not an interruptible syscall it is | ||
| * a special case where we must use the safe_syscall wrapper: | ||
| * if we allow a signal to happen before we make the host | ||
| @@ -8537,7 +8562,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, | ||
| * before the execve completes and makes it the other | ||
| * program's problem. | ||
| */ | ||
| - ret = get_errno(safe_execve(p, argp, envp)); | ||
| + ret = get_errno(safe_execve("/proc/self/exe", argp, envp)); | ||
| unlock_user(p, arg1, 0); | ||
|
|
||
| goto execve_end; | ||
| -- | ||
| 2.29.2 | ||
|
|
78 changes: 78 additions & 0 deletions
78
patches/buildkit-direct-execve-v6.0/0002-linux-user-lookup-user-program-in-PATH.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| From 945c7a9e623d915c2e1535894aa90362ed114c08 Mon Sep 17 00:00:00 2001 | ||
| From: Tibor Vass <[email protected]> | ||
| Date: Tue, 2 Jun 2020 10:39:48 +0000 | ||
| Subject: [PATCH 2/5] linux-user: lookup user program in PATH | ||
|
|
||
| Signed-off-by: Tibor Vass <[email protected]> | ||
| (cherry picked from commit 1102f3dc7a4db75e72d25b2eab8503f52c44a542) | ||
| Signed-off-by: Tibor Vass <[email protected]> | ||
| --- | ||
| linux-user/main.c | 45 ++++++++++++++++++++++++++++++++++++++++++++- | ||
| 1 file changed, 44 insertions(+), 1 deletion(-) | ||
|
|
||
| diff --git a/linux-user/main.c b/linux-user/main.c | ||
| index f956afccab..36f0c85957 100644 | ||
| --- a/linux-user/main.c | ||
| +++ b/linux-user/main.c | ||
| @@ -551,6 +551,45 @@ static void usage(int exitcode) | ||
| exit(exitcode); | ||
| } | ||
|
|
||
| +/* | ||
| + * path_lookup searches for an executable filename in the directories named by the PATH environment variable. | ||
| + * Returns a copy of filename if it is an absolute path or could not find a match. | ||
| + * Caller is responsible to free returned string. | ||
| + * Adapted from musl's execvp implementation. | ||
| + */ | ||
| +static char *path_lookup(char *filename) { | ||
| + const char *p, *z, *path = getenv("PATH"); | ||
| + size_t l, k; | ||
| + struct stat buf; | ||
| + | ||
| + /* if PATH is not set or filename is absolute path return filename */ | ||
| + if (!path || !filename || filename[0] == '/') | ||
| + return strndup(filename, NAME_MAX+1); | ||
| + | ||
| + k = strnlen(filename, NAME_MAX+1); | ||
| + if (k > NAME_MAX) { | ||
| + errno = ENAMETOOLONG; | ||
| + return NULL; | ||
| + } | ||
| + l = strnlen(path, PATH_MAX-1)+1; | ||
| + | ||
| + for (p = path; ; p = z) { | ||
| + char *b = calloc(l+k+1, sizeof(char)); | ||
| + z = strchrnul(p, ':'); | ||
| + if (z-p >= l) { | ||
| + if (!*z++) break; | ||
| + continue; | ||
| + } | ||
| + memcpy(b, p, z-p); | ||
| + b[z-p] = '/'; | ||
| + memcpy(b+(z-p)+(z>p), filename, k+1); | ||
| + if (!stat(b, &buf) && !(buf.st_mode & S_IFDIR) && (buf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH))) | ||
| + return b; | ||
| + if (!*z++) break; | ||
| + } | ||
| + return strndup(filename, NAME_MAX+1); | ||
| +} | ||
| + | ||
| static int parse_args(int argc, char **argv) | ||
| { | ||
| const char *r; | ||
| @@ -616,7 +655,11 @@ static int parse_args(int argc, char **argv) | ||
| exit(EXIT_FAILURE); | ||
| } | ||
|
|
||
| - exec_path = argv[optind]; | ||
| + /* not freeing exec_path as it is needed for the lifetime of the process */ | ||
| + if (!(exec_path = path_lookup(argv[optind]))) { | ||
| + (void) fprintf(stderr, "qemu: could not find user program %s: %s\n", exec_path, strerror(errno)); | ||
| + exit(EXIT_FAILURE); | ||
| + } | ||
|
|
||
| return optind; | ||
| } | ||
| -- | ||
| 2.29.2 | ||
|
|
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